bluuebunny/crossref_metadata_2025 huggingface dataset:
The development of new anti-personnel weapons
Authors: Doswald-Beck Louise , Cauderay Gérald C.
Published: May 2019

Article 36 of Additional Protocol I of 1977 states that:

“In the study, development, acquisition or adoption of a new weapon, means or method of warfare, a High Contracting Party is under an obligation to determine whether its employment would, in some or all circumstances, be prohibited by this Protocol or by any other rule of international law applicable to the High Contracting Party”.

The provision is not new law, but codifies the customary law duty of implementing a treaty or customary rule in good faith. Article 36 does, however, draw attention to the fact that new developments in weapons are quietly going on, and that care must be taken, before their deployment, that their use in some or all circumstances does not violate international humanitarian law. Although the duty to determine in advance the legality of the use of new weapons lies with the State developing them, other States have a legal interest in ensuring that this is done.
The Failure of The Remedy of Reduction in Israeli Law — Causes and Lessons
Authors: Zamir Eyal
Published: May 2019

The process of codifying Israeli private law began in the mid-1960's. Since then, numerous laws have been enacted, each devoted to a certain field or transaction (land law, pledges, sales, etc.). The idea was, and continues to be, that after the enactment of the separate laws is completed, they will be combined in order to create an integral, complete civil code. This stage of enactment is nearly finished, and at present a jurists' committee is considering changes and adjustments required in any of the laws in order to fit them together into one code. This method of legislation by stages has many disadvantages, which have been pointed out in the legal literature. However, there are also advantages. The new laws in the sphere of private law are not inspired by a single legal system or by any particular existing code; rather, they constitute an original, modern Israeli creation, based on comprehensive comparative research and implementation of new, original ideas. In the absence of an established Israeli legal tradition, and absent rooted legal concepts or terminology, the Israeli legislature must create a code which does not grow naturally out of an existing legal system. The code itself will constitute the basis for future development of the system.
Forty Years of Israeli Law: Constitutional Law
Authors: Gavison Ruth
Published: May 2019

The symposium on 40 years of Israeli law presented the principal speakers with a formidable task, as one cannot do justice to the developments that have taken place in an entire branch of law over 40 years within the confines of a short lecture. This is perhaps especially true of Israeli constitutional law, which contains a wealth of matters deserving of discussion. Thus it may be that the method chosen by Professor Shetreet — a discussion of selected topics — is the best solution a specialist in this field could offer. However, speaking for myself as one who observes constitutional law as an outsider, it is essential to place these individual trees in their proper place in the forest. A further difficulty is that the article published here is a considerable expansion of the oral presentation to which it was my task to respond. I shall therefore confine my remarks mainly to placing these selected topics in their proper context, adding a few short and incomplete comments regarding the issues themselves. This approach seems preferable also because, generally speaking, I have no quarrel with the concluding, operative remarks in Shetreet's article.
The Applicability of the Laws of War to Judea and Samaria (the West Bank) and to the Gaza Strip
Authors: Bar-Yaacov Nissim
Published: May 2019

In her instructive article, Professor Lapidoth discussed, inter alia, the applicability of the laws of war to the territories administered by the Israel Defence Forces since the Six Day War of 1967. Being in full agreement with Professor Lapidoth that from the legal standpoint the situation is in need of improvement, I wish to deal more extensively with two questions: (1) What is the position of the Government of Israel regarding the applicability to Judea and Samaria and to the Gaza Strip of the Hague Regulations of 1907 respecting the Laws and Customs of War on Land, and of the Fourth Geneva Convention of 1949 relative to the Protection of Civilian Persons in Time of War? (2) What is the position of the Supreme Court with regard to the applicability of the Regulations and the Convention to these territories.
Forty Years of Criminal Law — Further Comments
Authors: Kremnitzer Mordechai
Published: May 2019

In the following lines, I shall attempt to expand somewhat the scope of the survey, as a supplement to Dr. Miriam Gur-Arye's excellent paper on the requirement of fault. In addition, I will refer to the principle of legality, and to legislation in the field of criminal law. I shall also indicate what I regard as the proper directions for future development, as well as point out novel and disturbing trends in the application and implementation of the law.

Although Agranat J. had the courage to advance Israeli law beyond English law, by recognizing irresistible impulse in the wake of developments in the field of psychiatry and by a non-historical interpretation of the law, contemporary Israeli case law has refrained from taking another step forward in the light of further development in that science.
Procedure and Evidence in Criminal Trials
Authors: Naor Miriam
Published: May 2019

Professor Harnon set a broad canvas. In the ten minutes allotted me, I shall address but a few of the topics he raised.

I would like principally to devote my comments to the subject of unrepresented defendants, as viewed from the perspective of a trialcourt judge.

Our rules of procedure and of evidence are fair and reasonable. There are differences of opinion as to the preferred approach to several of the issues mentioned by Prof. Harnon: the scope of the right to remain silent, the admissibility of out-of-court statements and the striking of a proper balance in this regard, etc. Notwithstanding the differences in approach to any particular topic, the system as a whole fulfils the purpose of the substantive criminal law — the establishing of the innocence or guilt of the accused.
Forty Years of Civil Procedure
Authors: Goldstein Stephen
Published: May 2019

One may ask what changes have occurred in Israeli civil procedure in the 40 years of the existence of the State. The answer is clear—almost none. This is true as to both of the major concerns of civil procedure, i.e., (a) the conduct of the proceedings pursuant to the rules of civil procedure, and (b) the court structure and allocation of jurisdiction among the different courts.

Of course there have been some changes in the last 40 years. Regarding the Rules of Civil Procedure one can point to changes such as the expansion of the use of summary process and originating summons, along with the abolition of the docket preference given to summary process proceedings after a right to defend has been granted; the adoption of the American pre-trial conference proceeding; important developments as to linkage differentials and interest that are added to money judgments; and expansion of third-party practice proceedings.
Is it Necessary to Apply “Physical Pressure” to Terrorists – and to Lie About it?
Authors: Dershowitz Alan M.
Published: May 2019

It is a conundrum that has long intrigued philosophers, novelists, lawyers, and ordinary citizens: a captured terrorist knows the location of a ticking bomb that threatens hundreds of innocent lives; the only way to prevent the mass murder is to torture the terrorist into disclosing the bomb's location; there is no time for reflection; a decision must be made. Does the noble end of saving innocent lives justify the ignoble means of employing torture?

We know, of course, what all governments would actually do under these conditions of tragic choice: they (or more precisely, some flack-catching underling) would torture (with the implicit approval of the powers-that-be). But could the government justify it? Would they write a law expressly authorizing such means? Or would they choose the “way … of the hypocrites: they declare that they abide by the rule of law, but turn a blind eye to what goes on beneath the surface” (R.,78).
The Landau Commission Report – Was the Security Service Subordinated to the Law, or the Law to the “Needs” of the Security Service?
Authors: Kremnitzer Mordechai
Published: May 2019

The principal significance of the Landau Commission Report lies in its conclusion that, under the provisions of the necessity defence, the exertion of a moderate measure of physical pressure is both justifiable and permissible in the interrogation of persons suspected of hostile terrorist activity (HTA). This conclusion extends both forward to the future and backward to the past. For the future, it licenses the employment of physical pressure in such investigations; as to the past, it lends significant support to another of the Commission's conclusions, that no proceedings be instituted against persons who were found by the Commission to bearprima facieresponsibility for serious criminal offences (i.e., perjury at the very least). In my opinion, the Commission's central conclusion and its implications are unjustified. It is based upon factual findings and evaluative judgments which are, as I shall attempt to demonstrate, problematic.

Before embarking, however, I should like to sketch a synoptic view of the Report for the reader, which will then enable me to expand upon the connection between the Commission's factual and evaluative findings and its normative conclusions. Regarding the facts, the Commission determined that: 1) GSS interrogators had systematically employed physical pressure on HTA suspects; and 2) interrogators had lied about this fact to the courts. The Commission's normative conclusions were that it is permissible to employ physical pressure in HTA interrogations, but forbidden to lie to the court.
Mechanism of Glyphosate Tolerance in Birdsfoot Trefoil (Lotus corniculatus)
Authors: Boerboom Chris M. , Wyse Donald L. , Somers David A.
Published: May 2019

The mechanism of glyphosate tolerance was investigated in nine birdsfoot trefoil selections that exhibited a threefold difference in glyphosate tolerance. Single-stemmed ramets (vegetative clones) established from the nine selections were used to evaluate tolerance to glyphosate, spray retention, and14C-glyphosate absorption and translocation in growth chamber experiments. The tolerance of greenhouse-grown ramets correlated with the tolerance of field-grown plants, indicating that tolerance was not a function of plant size or affected by environment. The nine selections differed in spray retention and14C-glyphosate translocation but not in glyphosate absorption. The differences in retention and translocation were not correlated with the level of glyphosate tolerance but could contribute to the tolerance of an individual plant. The specific activity of 5-enolpyruvylshikimate 3-phosphate synthase (EPSPS) (EC 2.5.1.19) ranged from 1.3 to 3.5 nmol min−1mg−1protein among the nine selections assayed and was positively correlated with plant tolerance level. These results indicate that the primary mechanism of glyphosate tolerance in birdsfoot trefoil is based on the level of EPSPS activity.
Uptake, Metabolism, and Activity of Haloxyfop in Liquid Cultures of Proso Millet (Panicum miliaceumL. cv Abarr)
Authors: Irzyk Gerard P. , Bauman Thomas T. , Carpita Nicholas C.
Published: May 2019

Suspension cultures of proso millet cells were treated with haloxyfop at different phases of growth. Treatment of 1-d cultures with 1 μM haloxyfop completely inhibited growth within 48 h. In contrast, 1 mM haloxyfop was required to elicit a similar response in 4-, 7-, or 10-d cultures. Calculated IC50values indicated a 300-fold decrease in haloxyfop sensitivity during the period from 1 to 4 d. The observed changes in sensitivity to haloxyfop could not be attributed to changes in cell concentration during culture growth. In both 1-d and 4-d cultures, an initial rapid uptake of radiolabel was followed by a slow loss of radiolabel from cells. Almost all radioactivity extracted from 1-d and 4-d cells was present as the parent acid. Several radiolabeled compounds in addition to the parent acid were present in media. No major differences in the amounts of these materials were found between 1-d and 4-d media. Our results indicate that a special aspect of metabolism expressed during cell division is particularly sensitive to the herbicide.
Decline of Weed Seeds and Seedling Emergence Over Five Years as Affected by Soil Disturbances
Authors: Egley Grant H. , Williams Robert D.
Published: May 2019

Weed emergence and viable weed seed numbers were determined in field plots during a 5-yr period where reseeding was prevented. Known numbers of seeds of seven weed species were added to the native seed population at the beginning of the study. Plots were nontilled or tilled to depths of 0, 5, 10, and 15 cm early in the spring of each year. Velvetleaf, spurred anoda, hemp sesbania, morningglory species, and pigweed species emergence was significantly greater from the nontilled plots during the first year after seeds were added to the native seed population. Tillage, regardless of depth, reduced weed emergence during the first year where seeds were added to the plots but had no effect on emergence from plots where no seeds were added. Tillage during the second through the fifth year did not affect emergence regardless of the addition of seeds. of the 5-yr emergence totals, 61 to 88% of all weeds in all plots emerged during the first year and 9 to 23% emerged during the second year. The 5-yr decline rate for emergence of all weeds was exponential. Viable seeds of prickly sida, spurges, and pigweeds in the nontilled plots declined from 590, 1531, and 4346 m−2, respectively, to zero by the third year. Tillage did not affect the decline. However, weed emergence in the field indicated that a few (1.0 to 5.6 m−2) seeds of those weeds were still viable after 3 yr. In nontilled plots, many recently added seeds were on or near the soil surface and germinated during the first year. Tillage moved many seeds to sites that were unfavorable for germination and emergence during the first year.
Weed Seed Population Response to Tillage and Herbicide Use in Three Irrigated Cropping Sequences
Authors: Ball Daniel A. , Miller Stephen D.
Published: May 2019

Research was conducted to evaluate the effects of primary tillage (moldboard plowing and chisel plowing), secondary tillage (row cultivation), and herbicides on weed species changes in the soil seed bank in three irrigated row cropping sequences over a 3-yr period. The cropping sequences consisted of continuous corn for 3 yr (CN), continuous pinto beans for 3 yr (PB), and sugarbeets for 2 yr followed by corn in the third year (SB). A comparison between moldboard and chisel plowing indicated that weed seed were more prevalent near the soil surface after chisel plowing. The density of certain annual weed seed over the 3-yr period increased more rapidly in the seed bank after chisel plowing compared to moldboard plowing. Species exhibiting the most pronounced increase included hairy nightshade and stinkgrass in the PB cropping sequence and redroot pigweed and common lambsquarters in the SB sequence. Conversely, kochia seed density in the SB sequence decreased more rapidly in chisel-plowed plots. Row cultivation generally reduced seed bank densities of most species compared to uncultivated plots. Herbicide use in each cropping sequence produced a shift in the weed seed bank in favor of species less susceptible to applied herbicides. In particular, seed of hairy nightshade became prevalent in the PB cropping sequence, and seed of kochia, redroot pigweed, and common lambsquarters became prevalent in the SB sequence.
Influence of Soil Temperature, Soil Moisture, and Seed Burial Depth on the Emergence of Round-Leaved Mallow (Malva pusilla)
Authors: Blackshaw Robert E.
Published: May 2019

A study was conducted under controlled environmental conditions to determine the effect of soil temperature, soil moisture, and depth of seed burial on the emergence of round-leaved mallow. Emergence occurred from 5 to 30 C but was optimal at 15 to 20 C. Soil moisture had a greater effect than soil temperature on percentage emergence. Emergence progressively declined below a soil water content of −0.28 MPa, with less than 20% emergence attained at −1.03 to −1.53 MPa. In contrast, rate of emergence of round-leaved mallow was affected more by soil temperature than by moisture. A decrease in temperature from 30 to 5 C increased the time to reach 50% emergence by 10 to 12 days over the moisture regime of this study. Emergence was greatest at depths of 0.5 to 2 cm. No emergence occurred at 8 cm or below. The potential of using the findings of this study to develop cultural control strategies for round-leaved mallow is discussed.
Modeling Soybean Growth and Canopy Apportionment in Weed-Soybean (Glycine max) Competition
Authors: Pike David R. , Stoller Edward W. , Wax Loyd M.
Published: May 2019

Field studies using area-of-influence techniques were conducted in 1987 and 1988 to evaluate soybean growth and yield, and to predict soybean yield losses from photographs of jimsonweed and common cocklebur canopies. Differences in weed competitiveness within the 100-cm area of influence were induced by dates of soybean planting, locations, weed species, and years. Soybean yield losses within the first 20-cm interval from weeds correlated well with yield of all soybean plants within 100 cm of weeds (r2= 0.86). Soybean growth responses as a function of distance from weeds were best described by complex polynomials, but simple linear functions, based on a data point from soybean plants nearest a weed and from the average of plants 60 to 100 cm from a weed, closely approximately actual yield losses (r2= 0.96). Soybean yield losses were highly correlated (r2= 0.84) with leaf area of weeds as viewed from directly above the weed-crop canopy. Weed canopy diameter, measured from overhead photographs 8 weeks after soybean emergence, also correlated well with soybean yield losses (r2= 0.82), but correlation with actual weed leaf area was not significant (r2= 0.31).
Herbicide-Grazing Interactions in Cheat (Bromus secalinus)–Infested Winter Wheat (Triticum aestivum)1
Authors: Koscelny Jeffrey A. , Peeper Thomas F.
Published: May 2019

Field experiments were conducted to determine the interaction of grazing and herbicide treatments on cheat control and biomass, wheat biomass, wheat grain yield, and wheat yield components. Ethyl-metribuzin at 1120 g ai ha−1and metribuzin at 420 g ai ha−1reduced cheat biomass 91 to 99 and 97 to 98%, respectively. Grazing had no effect on herbicide efficacy. Grazing increased cheat biomass in the check by 24% at only one location but did not affect total wheat plus cheat biomass. With one exception, controlled cheat was replaced by wheat on a 1:1 biomass basis when herbicides caused no crop injury. All herbicide treatments increased grain yield, but grazing did not alter yield. At two locations, increased heads m−2and spikelets/head accounted for most of the grain yield increases, but at one location seeds/spikelet and weight/seed were also increased. Harvest index was unaffected.
Soil Water Content Affects the Activity of Four Herbicides on Green Foxtail (Setaria viridis)
Authors: Boydston Rick A.
Published: May 2019

Low soil water content for 10 to 14 days before and 7 days after herbicide application reduced control of green foxtail with fenoxaprop, fluazifop-P, haloxyfop, and sethoxydim. Withholding irrigation for 10 to 14 days before herbicide application did not reduce control of green foxtail with normal use rates of herbicides if plots were irrigated at the time of application. Low soil water content reduced the activity of sethoxydim less than the other herbicides.
Sorption and Degradation of Thiobencarb in Three Florida Soils
Authors: Braverman Michael P. , Dusky Joan A. , Locascio Salvadore J. , Hornsby Arthur G.
Published: May 2019

Laboratory studies were conducted to characterize the adsorption-desorption and degradation of thiobencarb in soil. Thiobencarb adsorption on soil was correlated with soil organic carbon (r = 0.97) and values (ml g−1) for the following soils were: Pahokee muck 339, Everglades muck 169, and Immokalee sand 14. The adsorption values (ml g−1) per unit of organic carbon were Immokalee sand 1195, Pahokee muck 765, and Everglades muck 539. In desorption studies, thiobencarb Kfvalues increased 80 ml g−1from the first to the third desorption step in the muck soils, but were similar in three desorptions from the sand. The half-lives of thiobencarb averaged 16, 18, and 24 days on surface samples of Pahokee muck, Everglades muck, and Immokalee sand, respectively, across the range of 25 to 35 C and 10 to 100 kPa soil water tension. Half-lives were generally longer with water contents equivalent to 100 kPa than 10 kPa soil water tension and incubated at 25 than 35 C. The relative percentages of extractable14C, bound14C, and14CO2from14C-thiobencarb-treated soil were dependent on soil type, soil water content, incubation temperature, and time.
Alachlor and Metribuzin Movement and Dissipation in a Soil Profile as Influenced by Soil Surface Condition
Authors: Jones Ronald E. , Banks Philip A. , Radcliffe David E.
Published: May 2019

The influence of wheat straw cover, tillage, and irrigation on metribuzin and alachlor movement and dissipation in an Appling coarse sandy loam (Typic Hapludult) and the influence of soil depth on their rate of dissipation were measured in field and laboratory experiments conducted in 1987 and 1988. Overall, metribuzin moved more than alachlor in both years. Alachlor movement was greater in tilled plots compared to no-till plots in 1988. Metribuzin movement was greater in no-till plots in 1987. Straw cover had little effect on the movement of alachlor, but the presence of 2800 kg ha−1of straw on the soil surface increased the downward movement of metribuzin in both years compared to soil with no straw cover. The rate of alachlor dissipation in the soil was faster in straw-covered and no-till plots in both years and in the high irrigation level in 1988. Metribuzin dissipation was not affected by any of these factors. Alachlor rate of dissipation did not differ among depths in the field; however, dissipation differed in the laboratory in the order 0 to 20 cm > 20 to 45 cm = 45 to 68 cm. Metribuzin dissipated faster at the 8-cm depth in the field compared to the 58-cm depth. In the laboratory, metribuzin dissipation rates followed the order 0 to 20 cm > 20 to 45 cm > 45 to 68 cm. At the greatest depth, the dissipation of metribuzin was faster in the field than in the laboratory.
Characterization of Triazine-Resistant Biotypes of Common Lambsquarters (Chenopodium album), Hairy Fleabane (Conyza bonaeriensis), and Yellow Foxtail (Setaria glauca) Found in Spain
Authors: De Prado Rafael , Dominguez Carmen , Tena Manuel
Published: May 2019

Triazine-resistant (R) biotypes of common lambsquarters, yellow foxtail, and hairy fleabane were found in the Province of Córdoba (Andalusia, Southern Spain). The former two R biotypes came from atrazine-treated cornfields, whereas the latter came from simazine-treated nontilled olive orchards. The R biotypes of common lambsquarters and yellow foxtail and the R biotype of hairy fleabane survived at doses up to 5 kg ai/ha of soil-applied atrazine or simazine, respectively. Photosynthetic electron transport in R biotypes was unaffected by atrazine and simazine but was inhibited by diuron, as shown by fluorescence induction measurements in whole leaves. In Hill reaction assays, the R biotypes showed high resistance to atrazine and simazine (resistance factors in the range of 350 to 550), medium to high resistance to ametryn, terbumeton, metribuzin, and monolinuron (resistance factors in the range of 80 to 250), slight resistance to diuron and methabenzthiazuron (resistance factors in the range of 1.1 to 15.7), and reverse resistance to swep, ioxynil, and DNOC (resistance factors less than 1). It is concluded that the R biotypes have a chloroplast mode of resistance similar to that previously described for other triazine-resistant weed biotypes.
Phytotoxicity, Absorption, and Translocation of Five Clopyralid Formulations in Honey Mesquite (Prosopis glandulosa)
Authors: Bovey Rodney W. , Hein Hugo , Keeney F. Nelson
Published: May 2019

Foliar sprays of the monoethanolamine salt, potassium salt, free acid, and 1-decyl ester of clopyralid were more effective in killing greenhouse-grown honey mesquite than the 2-ethylhexyl ester at rates of 0.28 ae/ha or less. More clopyralid was transported to the lower canopy from application of the monoethanolamine salt and potassium salt than the 2-ethylhexyl ester of clopyralid at 4 h or 1, 3, or 8 days after treatment. Application of the monoethanolamine salt and the 2-ethylhexyl ester to leaves with a pipet indicated that about twice as much clopyralid was absorbed within 15 min from the ester form (26%) than from the amine form (12%) of the total recovered. However, after 24 h, absorption of the ester was less than the amine. More than twice as much clopyralid was transported from the treated leaf after application of amine than the ester. Only the acid form of clopyralid was transported away from the site of application of either ester or amine.
Herbicidal Metabolites from a Soil-Dwelling Fungus (Scopulariopis brumptii)
Authors: Huang Jamin , Putnam Alan R. , Werner Georgina M. , Mishra Saroj K. , Whitenack Curt
Published: May 2019

The fungusScopulariopis brumptiiSalvanet-Duval (MSU 42018) was isolated from a soil sample collected from the rhizosphere of a potted asparagus plant. When cultured 7 days in A-9 broth medium, the organism produced compounds phytotoxic to seeding dicotyledonous weeds (via foliar application) and toChlamydomonas reinhardtiiDangeard. Three herbicidal metabolites, 3-hydroxybenzyl alcohol, 2-methylhydroquinone, and (+)-epiepoformin, were isolated by column and thin-layer chromatography (TLC) and structures confirmed by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic reasonance spectroscopy (NMR), and mass spectrometry (MS). Of the three compounds, (+)-epiepoformin was the most active, providing complete control of redroot pigweed and 88% control of white mustard when applied at 4.4 kg/ha.
Physiological Basis for the Different Phloem Mobilities of Chlorsulfuron and Clopyralid
Authors: Devine Malcolm D. , Bestman Hank D. , Vanden Born William H.
Published: May 2019

Foliar-applied clopyralid was translocated much more readily than chlorsulfuron in the phloem of Tartary buckwheat plants. This result was not due to greater penetration of clopyralid into the treated leaf or to greater retention of chlorsulfuron in the cuticle. Experiments with excised leaf disks indicated that chlorsulfuron was taken up more readily by the leaf tissue and accumulated in the tissue to a higher concentration than clopyralid. Both herbicides effluxed readily from the tissue after transfer to herbicide-free medium, indicating that the accumulation was not due to irreversible binding within the tissue. Chlorsulfuron (2.8 nmol) applied with14C-sucrose reduced14C export from the treated leaf. Chlorsulfuron also reduced export of14C following exposure of the treated leaf to14CO2at 6, 12, or 24 h after herbicide application. This effect of chlorsulfuron could be partially reversed by pretreating the plants with a combination of 1 mM valine, leucine, and isoleucine. In similar experiments clopyralid had no effect on assimilate transport. It is concluded that phloem translocation of chlorsulfuron in sensitive species is limited by a rapid, indirect effect on phloem transport that reduces both its own translocation and that of assimilate.
Morphology, Development, and Recrystallization of Epicuticular Waxes of Johnsongrass (Sorghum halepense)
Authors: McWhorter Chester G. , Paul Rex N. , Barrentine William L.
Published: May 2019

Johnsongrass leaves were covered with epicuticular wax that varied from 16 to 25 μg/cm2on leaf blades and 56 to 206 μg/cm2on leaf sheaths. At emergence, leaves were covered with a layer of smooth amorphous wax, but crystalline wax (wax plates) began to form on the amorphous wax within 1 or 2 days. This continued until all leaf surfaces were covered with wax plates. At 3 to 4 weeks of age, a smooth layer of coalescence wax was deposited over the wax plates. Formation of coalescence wax continued until nearly all leaf surfaces were covered with a smooth wax layer. Production of wax filaments began when plants were 3 to 4 weeks old and these tubular structures extended 100 to 200 μm above all other wax formations. Deposition of amorphous wax continued after stomata closed in the darkness, sealing over stomata, but the wax layer was broken when stomata opened again in the light. A capillary method was devised that was used to evaporate chloroform containing leaf waxes through 0.1- to 1.2-μm pores in inert filters to recrystallize amorphous wax and wax plates similar to that produced on johnsongrass leaves. Recrystallization of wax from wax filaments dissolved in chloroform produced the same structures of amorphous wax and wax plates as when only wax from leaves with amorphous wax and wax plates was used. Wax washed from leaves also produced wax plates and a variety of crystalline structures on the walls of glass vials after chloroform solutions were evaporated. This result indicated that the morphology of epicuticular waxes is influenced more by their inherent chemical and physical properties than by underlying cells or the cuticular membrane.
Weed Control in Barley (Hordeum vulgare) – No-Till Grain Sorghum (Sorghum bicolor) Production
Authors: Diawara Moussa M. , Banks Philip A.
Published: May 2019

Field research to determine the influence of weed control systems in winter barley on subsequently no-till-planted grain sorghum was conducted from 1985 to 1987 in northwest Georgia. Herbicide treatments applied to fully tillered winter barley included 2,4-D, dicamba, metribuzin, oryzalin, oryzalin plus metribuzin, fluorochloridone, or thiameturon. None of these herbicides affected barley grain yields compared to nontreated plots. Treatments containing oryzalin reduced johnsongrass fresh weights in the subsequently planted grain sorghum. Oryzalin plus metribuzin, in 1 of 2 yr, resulted in higher seed yields of subsequently planted grain sorghum compared to the other treatments except for oryzalin used alone. Treatments containing paraquat plus propazine plus metolachlor applied to grain sorghum provided good weed control when averaged across barley treatments and resulted in the highest grain sorghum yield. No grain sorghum injury from herbicides used in the previous winter barley crop was observed.
Effect of Water Stress, Nitrogen, and Gibberellic Acid on Fluazifop and Glyphosate Activity on Oats (Avena sativa)
Authors: Dickson Ross L. , Andrews Mitchell , Field Roger J. , Dickson Euan L.
Published: May 2019

A series of experiments was carried out on oat to test the efficacies of fluazifop and glyphosate against water-stressed plants, plants grown in low and high nitrogen (N), and plants treated with gibberellic acid (GA). In the laboratory, plants maintained at wilting point for 5 days before and 9 days after spraying with fluazifop (0.5 kg ae/ha) appeared healthy 32 days after herbicide application, while plants supplied with water throughout the experiment were completely chlorotic/necrotic and had main stem detachment from within the leaf sheaths. In the field, plants maintained unirrigated until 14 days after spraying with fluazifop (0.25 kg/ha) or glyphosate (0.18 kg ae/ha) showed greater tolerance of the herbicides than plants irrigated regularly. Under well-watered conditions in the laboratory and field, fluazifop (0.25 kg/ha) and glyphosate (0.18 kg/ha) were less toxic at low N than high N. Increased fluazifop activity at high N was associated with increased transport of herbicide to apical meristems. Addition of 200 μg GA into the leaf sheaths 2 days prior to spraying with fluazifop or glyphosate increased the efficacy of both herbicides at low N.
Antagonistic Effect of MCPA on Fenoxaprop Activity
Authors: Deschamps Raymond J. A. , Hsiao Andrew I. , Quick William A.
Published: May 2019

Greenhouse and field studies were conducted to determine the effect of the isooctyl ester of MCPA on the activity of the ethyl ester of fenoxaprop in four grass species. In the greenhouse, wheat tolerated fenoxaprop better than barley, oat, and wild oat. Among wild oat populations, SH 430 was the most tolerant to fenoxaprop followed by MON 73, CS 40, the natural population, and AN 51. MCPA reduced fenoxaprop activity in wheat and barley, protecting the crops from herbicide injury. However, MCPA did not reduce the activity of fenoxaprop in most wild oat lines. In field studies, wheat and barley treated with fenoxaprop at 150 g/ha plus MCPA at 300 g/ha were not appreciably different from weed-free controls while fenoxaprop applied alone at 150 g/ha damaged the crops. Fenoxaprop applied at 150 g/ha in combination with 300 g/ha MCPA resulted in at least 78% wild oat control.
Characterization of Alachlor and Atrazine Desorption from Soils
Authors: Clay Sharon A. , Koskinen William C.
Published: May 2019

Herbicide desorption isotherms may be affected by the amount of nondesorbable herbicide present in soil. Nondesorbable alachlor (as determined after methanol extraction) generally increased on a Waukegan silt loam (Typic Hapludolls) and a Ves clay loam (Udic Haplustolls) during five 0.01 M CaCl2desorptions. Atrazine was totally extracted with methanol from the Waukegan soil after one desorption using 0.01 M CaCl2. However, after five desorptions with 0.01 M CaCl2an average of 5.5 and 15.5% of the total recovered atrazine from two atrazine application rates was methanol nondesorbable from the Waukegan and Ves soils, respectively. Freundlich desorption isotherms adjusted for nondesorbable herbicide accounted for as much as 71 % of the difference between adsorption and desorption isotherms. Only a portion of the hysteresis observed can be attributable to nondesorbable herbicide.
The Pathogenicity, Virulence, and Biocontrol Potential of TwoBipolarisSpecies on Johnsongrass (Sorghum halepense)
Authors: Winder Richard S. , Van Dyke C. Gerald
Published: May 2019

Bipolaris sorghicola(isolate BS1) and an unidentifiedBipolarisspecies (isolate BX1) were isolated from johnsongrass in North Carolina. Inoculum of BX1 was mass produced in solid and liquid cultures, whereas inoculum of BS1 could only be produced in solid cultures. When six formulations of inoculum of BX1 were compared, vegetable oil was the best adjuvant. Isolate BX1 displayed some host specificity in pathogenicity tests. In the greenhouse, isolate BS1 was more virulent on johnsongrass than isolate BX1. In growth chambers, increasing conidium concentration and younger plant ages interacted to increase virulence of BX1, as did interactions between inoculation, johnsongrass density, and low soil fertility. In Raleigh, NC, isolate BX1 caused very little damage in the field, with or without pretreatment with metolachlor. In Greenville, MS, isolate BX1 caused significant (52%) mortality to annual johnsongrass with very little damage to corn or grain sorghum. The biocontrol potential of the two organisms is uncertain.
Effects of Preemergence Herbicides on Soybean (Glycine max): Weed Competition
Authors: Adcock Timothy E. , Banks Philip A. , Bridges David C.
Published: May 2019

Glasshouse experiments were conducted to evaluate the effects of preemergence applications of metribuzin, pendimethalin, alachlor, and imazaquin on the competitive relationship between soybean and sicklepod, tall morningglory, or common cocklebur. An equal-ratio series design was employed where the proportion of species in a mixture remained constant and total plant density was varied. The ratio of soybean:sicklepod fresh weights was altered by alachlor and imazaquin while the ratio of soybean:tall morningglory fresh weights was altered only by imazaquin. The ratio of soybean:common cocklebur fresh weights was altered by metribuzin and imazaquin. Increasing herbicide rates resulted in higher soybean:weed fresh weight ratios and higher herbicide response coefficients.
The Weed Flora of Prince Edward Island Cereal Fields
Authors: Thomas A. Gordon , Ivany Jerry A.
Published: May 2019

Field surveys were conducted during 1978 and 1979 to determine the abundance and distribution of weeds in fields seeded to barley, oats, spring wheat, and mixtures of barley and oats in various proportions in the province of Prince Edward Island. Using a stratified random sampling procedure, weeds were counted in 536 fields during the 2-yr survey period. The weed flora had a large number of species that occurred at high densities, probably due to the limited herbicide use on Prince Edward Island. The average total number of species (64), number of species per field (20), and weed density (253 plants/m2) were similar among the four crop types and the five Extension Districts of the province. Only 49 of the 77 species encountered during the survey were found in 5% or more of the fields. Low cudweed, corn spurry, and common lambsquarters were the most abundant species, occurring in more than 80% of the fields at a mean density higher than 33.4 plants/m2. Red sorrel, smartweed, common hempnettle, broadleaf plantain, and quackgrass were also found in 80% or more of the fields, but at a mean density from 14.4 to 16.5 plants/m2. The perennials accounted for 51% of the commonly occurring species, annual and biennial broadleaf species accounted for 43%, and annual grasses were a minor group with only 6% of the species.
The Fate of Yellow Nutsedge (Cyperus Esculentus) Seed and Seedlings in Soil
Authors: Lapham Jon , Drennan Donald S. H.
Published: May 2019

Changes in dormancy and viability of freshly harvested seed of yellow nutsedge buried in the field, at depths of 5, 25, and 50 mm, were studied over a 2-yr period. The number of dormant, viable seed decreased most rapidly at 5 mm because more seed lost their dormancy and germinated (up to 30%) than at lower depths. Loss of viability through decay of seed appeared similar at all depths. No seedlings emerged from any depth. In a laboratory experiment, conducted in optimal soil moisture conditions, seedlings emerged from all seed that germinated, demonstrating that adequate soil moisture was critical for seedling establishment. This was substantiated in a second field experiment in which irrigation and mulching greatly increased seedling survival. The number of seedlings surviving in irrigated plots was 0.78% of seed sown and 0.03% in the rain-fed plots. The role of seed in the establishment of yellow nutsedge infestations is probably of little importance in dryland cropping areas despite the longevity and viability of the seed.
Interference from Established Stands of Silverleaf Nightshade (Solanum elaeagnifolium) on Cotton (Gossypium hirsutum) Lint Yield
Authors: Smith Brenda S. , Pawlak John A. , Murray Don S. , Verhalen Laval M. , Green J. D.
Published: May 2019

Field experiments were conducted in 1985 and 1986 under eight environments to evaluate the population dynamics of a range of silverleaf nightshade densities and to measure the effects of those populations on cotton lint yield. Dry weed weights of silverleaf nightshade stands were influenced by growing conditions among years, but were positively related to initial densities as long as 2 yr after establishment. Stem numbers increased as initial densities and stand age increased. A negative linear relationship existed between cotton lint yield and weed biomass and between cotton lint yield and stem number from both 1- and 2-yr-old weed stands. For each 1 kg/10 m of row increase in dry weed weight from 1- and 2-yr-old stands, a 9 and 21% lint yield loss/ha was predicted, respectively. For each stem/10 m of row, a 0.35 and 0.31% yield loss was predicted, respectively. Late-planted cotton was less vulnerable to yield reductions by silverleaf nightshade; however, its yield potential was also less.
Mutual Influences of Seedling Johnsongrass (Sorghum halepense), Sicklepod (Cassia obtusifolia), and Soybean (Glycine max)
Authors: Sims Barry D. , Oliver Lawrence R.
Published: May 2019

Field experiments were conducted to evaluate competitive effects of johnsongrass and sicklepod on growth and yield of irrigated and nonirrigated soybeans. Johnsongrass reduced soybean growth early in the growing season. Sicklepod was competitive all season, but competitiveness was greatest during the soybean reproductive stage. Soybean yields were reduced 31% by sicklepod, 14% by johnsongrass, and 36% by both weeds growing together. Nonirrigated soybeans yielded less than irrigated, but percent yield reductions were similar. Johnsongrass dry matter production and seed yield were reduced more than sicklepod by soybean interference. Soybean and sicklepod interference reduced johnsongrass seed production 73 to 95%. Johnsongrass produced 245 to 1238 seeds per plant when interfering with soybeans and sicklepod. Sicklepod seeds per plant were reduced 6 to 31% by johnsongrass interference and 47 to 75% by soybeans and soybeans plus johnsongrass.
Herbicidal Control of Duncecap Larkspur (Delphinium occidentale)
Authors: Mickelsen Larry V. , Ralphs Michael H. , Turner David L. , Evans John O. , Dewey Steven A.
Published: May 2019

Several herbicides were evaluated for their ability to control duncecap larkspur, a serious poisonous plant on mountain rangelands in the western U.S. Duncecap larkspur density was reduced from 33 to 93% by triclopyr applied at 2.2, 4.5, and 9.0 kg ae/ha. Picloram applied at 2.2 and 4.5 kg ae/ha reduced density from 33 to 99%. Metsulfuron applied at 86 and 138 g ai/ha reduced density from 50 to 98%. Glyphosate was the most effective herbicide, reducing density by 90 to 100% when applied at 2.2 kg ai/ha. Glyphosate reduced the cover of grasses and perennial forbs but increased cover of annual forbs. All rates of picloram and metsulfuron reduced forb cover. Grass cover increased in most plots where duncecap larkspur and forbs were reduced.
Influence of Tillage Systems on Annual Weed Densities and Control in Solid-seeded Soybean (Glycine max)
Authors: Buhler Douglas D. , Oplinger Edward S.
Published: May 2019

Field research was conducted at Arlington, WI, and Janesville, WI, in 1986 and 1987 to evaluate the effect of conventional-tillage, chisel plow, and no-till systems on the density and control of annual weed species in solid-seeded soybean. Common lambsquarters densities were not greatly influenced by tillage systems, but redroot pigweed densities were generally highest in the chisel plow system. Conventional tillage always had greater velvetleaf densities than no-till and no-till always had greater giant foxtail densities than conventional tillage. Giant foxtail and redroot pigweed became more difficult to control when tillage was reduced, while velvetleaf became less of a problem. This response was not observed with all herbicide treatments evaluated and several herbicide treatments provided excellent weed control. Soybean yield was not affected by tillage systems under weed-free conditions and differences in soybean yield appeared to be due to differences in weed control.
Effects of Additives on the Efficacy, Uptake, and Translocation of the Methyl Ester of Thifensulfuron
Authors: Fielding Robert J. , Stoller Edward W.
Published: May 2019

Effects of a 28% N solution containing urea and ammonium nitrate (28% UAN) on field efficacy of the methyl ester of thifensulfuron and combinations of thifensulfuron and the methyl ester of chlorimuron were investigated. Velvetleaf control and soybean injury increased as rates of thifensulfuron increased (0, 2.2, 4.4, and 5.8 g ai/ha) and as rates of chlorimuron increased (0, 4.4, and 8.8 g ai/ha). Treatments that included 28% UAN at 9 L/ha controlled velvetleaf 9% better, averaged across herbicides and rates 21 days after treatment (DAT), but also increased soybean injury. Thifensulfuron applications controlled common lambsquarters well, but control was not affected by additions of 28% UAN. In studies where14C-thifensulfuron was applied without an additive to the second true leaf of growth-chamber-grown velvetleaf, less than 4% of that applied was absorbed 84 h after treatment (HAT), whereas treatments that included nonionic surfactant or 28% UAN absorbed 33 and 45%, respectively. When both nonionic surfactant and 28% UAN were added, plants absorbed 76% 84 HAT. Translocation 84 HAT was also greatest with both additives and the majority moved to tissues above treated leaves. The 28% UAN increased uptake of thiameturon regardless of soil fertility level.
Rotation and Continuous use of Dietholate, Fonofos, and SC-0058 on EPTC Persistence in Soil
Authors: Bean Brent W. , Roeth Fred W. , Martin Alex R. , Wilson Robert G.
Published: May 2019

Field and laboratory studies were conducted to examine the influence of continuous use and rotation of extenders on EPTC persistence in soils from Clay Center and Scottsbluff, NE. Rotation of EPTC + dietholate and EPTC + fonofos in soils with three prior annual treatments of each combination did not improve weed control compared to continuous use. SC-0058 was generally effective in slowing EPTC biodegradation in soils previously treated with EPTC, EPTC + dietholate, EPTC + fonofos, or EPTC + SC-0058. Dietholate was effective in slowing EPTC biodegradation in soil previously treated with EPTC or EPTC + SC-0058. SC-0058 appeared to have an inhibitory influence on the initial development of soil-enhanced EPTC biodegradation. Any enhanced biodegradation of dietholate or SC-0058 that may occur after repeated use was not a factor in enhanced EPTC degradation in EPTC + extender history soils.
Persistence of Carbamothioate Herbicides in Soils Pretreated with Butylate
Authors: Lawrence Ernest G. , Skipper Horace D. , Gooden Dewitt T. , Zublena Joseph P. , Struble James E.
Published: May 2019

Field and laboratory studies were conducted to examine effects of prior butylate use on biodegradation of subsequent applications of butylate and four other carbamothioate herbicides. Bioassays were used to demonstrate reductions of butylate and EPTC activity in four soils preconditioned by annual butylate applications. Combining these herbicides with dietholate, an enzyme inhibitor, prolonged persistence and restored normal herbicidal activity. Expected herbicidal efficacy occurred in adjacent plots with no history of carbamothioate use. Prior applications of butylate resulted in cross-adapted degradation of EPTC but not vernolate, pebulate, or cycloate. When samples of Cecil soil were treated in the laboratory with14C-butylate, evolution of14CO2was significantly higher from soils that had received repeated field applications of butylate. The use of14C-herbkides could be used to predict problem soils and potential herbicide failure.
Fate of Safening Agent L-2-Oxothiazolidine-4-Carboxylic Acid in Sorghum (Sorghum bicolor)
Authors: Hilton James L. , Pillai Parthasarathy , Norman Helen A.
Published: May 2019

The herbicide safener OTC (L-2-oxothiazolidine-4-carboxylic acid) increased the amount of reduced thiol compounds in sorghum [Sorghum bicolor(L.) Moench. ‘DK 427′] seedlings. When seedlings were grown in liquid culture medium containing35S-OTC, the compound was metabolized to radiolabeled cysteine and glutathione. The addition of tridiphane [2-(3,5-dichlorophenyl)-2-(2,2,2-trichloroethyl)oxirane] increased conversion of35S-OTC to cysteine and resulted in the formation of one additional35S-labeled compound. When35S-glutathione was injected into germinating seeds it was converted to35S-cysteine and both thiols were subsequently found in roots and shoots. Seeds injected with35S-OTC both translocated the compound to developing roots and shoots and metabolized35S-OTC to cysteine and glutathione. Excised roots and shoots also metabolized35S-OTC to the thiols. In an in vitro assay the enzyme 5-oxoprolinase converted OTC to cysteine.