bluuebunny/crossref_metadata_2025_split huggingface dataset:
DIFFICULTIES IMPLEMENTING A MODELLING-BASED INTEGRATED PEST MANAGEMENT PROGRAM FOR ALFALFA
Authors: Fleming Richard A. 
Published: April 2011

AbstractA key element of a project designed for integrated pest management in alfalfa fields in New York State is a comprehensive simulation model. The model was developed as a guide for growers to determine when the costs of control measures against alfalfa weevil would be worthwhile. The model incorporates crop and insect submodels. Optimization techniques were used to identify the more cost effective of the possible management strategies. The project has been an unqualified success from a research standpoint but the results are not widely implemented by growers. In this respect, the project has suffered from institutional problems at the research level, lack of confidence and commitment in extension, and skepticism among growers. To rectify this situation, project staff recently adopted new approaches for implementing the program.
TEMPERATE FOREST INSECT OUTBREAKS, TROPICAL DEFORESTATION AND MIGRATORY BIRDS
Authors: Holling C.S. 
Published: April 2011

AbstractEcosystems that are managed for resource production are under continual structural change. Changes imposed by local management aggregate to produce regional patterns and new regionwide responses. Anthropogenic influences on hemispheric and global processes add another level of change. The result is a bewildering variety of real or anticipated changes unique to experience. For example, in the spruce/fir and budworm interaction of eastern North America, a syndrome of causes affects the vulnerability of renewable resources, and the triggers of change can never be predicted. Yet, it is possible to identify key features that affect resilience of ecosystems and robustness of regulation and to reject other possibilities. This approach provides a way to assign priorities for research and for contingency planning to adapt to change.
MATING BETWEEN DIAPAUSING AND NONDIAPAUSING STRAINS OF THE CITRUS RED MITE, PANONYCHUS CITRI (MCGREGOR)
Authors: Takafuji Akio 
Published: April 2011

AbstractThe reproductive compatibility between diapausing (DP) and nondiapausing (C) strains of the citrus red mite, Panonychus citri (M.), was determined by crossing experiments. Mating between the two strains was unrestricted, but copulation between C females and DP males was often broken off prematurely, whereas copulation in the reciprocal cross was of normal duration. Diapausing males showed a strong preference for guarding quiescent female deutonymphs of their strain prior to copulation, whereas C males did not. However, males of either strain showed no preference between adult females, resulting in only a partial, one-sided premating isolation between strains. No adult females were produced in the progeny from either interstrain cross, showing reproductive incompatibility is complete. Hatchability of the eggs from the cross between DP females and C males was significantly lower than that from the cross between C females and DP males, or from the intrastrain crosses, suggesting that even though some of the eggs in the former cross were fertilized, they died during embryonic stages. This possibility was supported by the observation that, for DP females mated with a C male, the second intrastrain mating was almost totally ineffective. Also, for C females mated with a DP male, a second intrastrain mating was often ineffective, but to a lesser extent than for DP females. When the two strains coexisted, effective mating was severely curtailed for both strains. The results explained the low proportion of females from overwintered DP eggs in a pear orchard in which the two strains coexisted the previous autumn.
WATER MITES (ACARI: PARASITENGONA: HYDRACHNIDA) OF SPRING HABITATS IN CANADA
Authors: Smith Ian M. 
Published: April 2011

AbstractThis paper reviews and summarizes information on the systematics, distribution, life history, and ecology of water mites in spring habitats in Canada, primarily on the basis of new data. The fauna comprises over 115 species, representing 57 genera and 25 families, in three ecological groups adapted for living in helocrenes, rheocrenes, and limnocrenes, respectively, though many species are able to exploit more than one type of spring habitat. The evolution of adaptations in water mites for living in spring habitats is discussed within the context of new hypotheses on the origins and zoogeography of spring-inhabiting taxa. A synopsis of available data suggests that knowledge of the species composition and structure of water mite communities can be used to characterize springs, and to assess and monitor the impact of environmental changes on these habitats. Inadequacies in the current database on Canadian species are identified, specifically uncertain species identities, incomplete zoogeographic data, inconsistent definition of spring habitats, and inadequate collecting techniques. Future studies are proposed to encourage research designed to overcome these inadequacies, and improve understanding of the biological roles of water mites inhabiting springs.
OSTRACODE ASSEMBLAGES FROM SPRINGS IN THE WESTERN UNITED STATES: IMPLICATIONS FOR PALEOHYDROLOGY
Authors: Forester Richard M. 
Published: April 2011

AbstractOstracodes are a diverse group of marine and continental crustaceans that have radiated into virtually all oxygenated aquatic environments that persist for more than about a month. Continental ostracodes live in both surface water and groundwater.Ostracodes living in springs and seeps have typically been the subject of systematic rather than ecologic studies. These taxa may or may not occur in other surface-water bodies. Similarly, lacustrine taxa may or may not be found in springs. Spring taxa occurring in other surface waters are often found in ponds, marshes, streams, or on the edges of lakes where groundwater discharge is important. Groundwater discharge, unlike lake water, shows limited and predictable variability in chemistry and temperature during the year. That level of variability relative to lake water may define particular ostracode environmental gradients. The gradients would range from stable, high-volume discharge springs occupied principally by spring species to high variability lakes occupied largely by lacustrine species.Ostracode occurrences may also be described by parameters such as temperature, solute (dissolved ion) composition, solute concentration (salinity, conductivity, ionic strength), and calcite saturation indices. A plot of these parameters associated with the presence of a taxon illustrates its physiologic response to the environment, a field. Three general fields bounded by chemical parameters are delineated by existing data. Those fields are as follows: (1) a restricted range and (2) a full range of fresh water, and (3) both fresh and saline water. Fields bounded by temperature and chemistry are also recognized. The fields also offer a way of describing ostracode occurrences in terms of hydrogeology and climate.If ostracode occurrences are limited by major chemical and physical properties of the aquatic environment, then their habitat may be defined by certain physical–chemical principles. The same physical–chemical principles must apply to the past. The ecology of extinct taxa may, therefore, be defined in the same environmental terms as those for extant taxa.
DEVELOPING A NEEM-BASED INSECTICIDE FOR CANADA
Authors: Isman M.B. , Koul O. , Arnason J.T. , Stewart J. , Salloum G.S. 
Published: April 2011

AbstractLeaves of the neem tree, Azadirachta indica A. Juss. (Meliaceae), have been used for centuries in India to protect stored grain from insect attack. Recent concern for the effects of synthetic insecticides on the environment and human health has provided the impetus for a reappraisal of the utility of neem derivatives as botanical crop protectants. Neem and its active principle, the limonoid azadirachtin, have several properties that are highly desirable for a natural insecticide. Azadirachtin is the most potent natural insect antifeedant discovered to date, suppressing insect feeding at concentrations of less than 1 part per million. Azadirachtin is also a potent insect growth regulator, which acts by disrupting molting and development, and interfering with reproduction in adult insects. These actions have been observed in over 90% of the more than 200 species of pest insects tested to date. Neem also has systemic action in some plants which could prove extremely valuable against stem- and root-feeding pests that are difficult to control. Finally, neem is essentially non-toxic to vertebrates, and in fact has a long history of medicinal use in southeast Asia.In the present paper we review our research aimed at developing a neem-based insecticide for use against pests of Canadian agriculture. We document the potent antifeedant action of azadirachtin in laboratory bioassays against the European corn borer, Ostrinia nubilalis Hübner, and the variegated cutworm, Peridroma saucia Hübner, and the molt-disrupting action of the compound in the migratory grasshopper, Melanoplus sanguinipes Fab., and the large milkweed bug, Oncopeltus fasciatus Dallas. Both antifeedant and insect growth regulatory activities of various samples of neem seed oil are shown to be correlated to azadirachtin concentrations in the oils. Field trials of an experimental neem insecticide conducted against pests of crucifers, corn, and potato in British Columbia, Ontario, and Prince Edward Island, respectively, indicate that the neem insecticide provides pest control as effective as or better than pyrethrum, the current botanical insecticide of choice for organic growers. The commercial prospectus for neem insecticides in Canada is discussed in light of our results.
GROUNDPLAN STRUCTURE AND HOMOLOGY OF THE PLEURON IN HYMENOPTERA BASED ON A COMPARISON OF THE SKELETOMUSCULATURE OF XYELIDAE (HYMENOPTERA) AND RAPHIDIIDAE (NEUROPTERA)
Authors: Gibson Gary A.P. 
Published: April 2011

AbstractThe groundplan structure and homologies of the mesothoracic pleurosternum of Hymenoptera are postulated using the subcoxal theory of the origin of the pterothoracic pleura of insects, and the cryptosternite theory of an invaginated sternum in most holometabolous insects, based on a comparison of the skeletomusculature of Xyelidae (Hymenoptera) and Raphidiidae (Neuroptera). The following are hypothesized for Hymenoptera: (1) the mesosternum is invaginated except for the prepectus, which is a detached remnant of the presternum; (2) lines that delineate ventral regions on the mesepisternum of many Symphyta are secondarily evolved sulci and arc not pleurosternal sutures; (3) a basalar cleft and an anepisternum are present in the groundplan structure; (4) in Hymenoptera other than Xyelidae the basalar cleft and anapleural cleft intersect so the anepisternum is detached as a separate sclerite, the postspiracular sclerite; (5) the pre-episternum is enlarged secondarily at the expense of the katepisternum, resulting in the paracoxal suture and a narrow katepisternum closely paralleling the posteroventral margin of the episternum anterior to the mesocoxa; (6) the mesepimeron is not divided into an anepimeron and katepimeron by a paracoxal suture but in some taxa is divided secondarily into an upper and lower mesepimeron by marks that delineate the line of confluence between different sets of muscles; and (7) the trochantin is absent from the groundplan structure. Postulated homologies support the hypothesis that Xyelidae represent the basal lineage of Hymenoptera but do not support the hypothesis that the rest of Hymenopera had a biphyletic origin from Xyelidae. The study exemplifies the positive feedback relationship between morphology and systematics and demonstrates the necessity of systematics and phylogenctic hypotheses for testing hypotheses of homology derived through comparative morphology. Schematic figures illustrate the subcoxal theory of pleuron origin and the postulated groundplan of the hymenopteran mesopleuron; mesothoracic muscles that were studied to help homologize pleurosternal features between Xyelidae and Raphidiidae are tabulated and skeletomusculature is documented by scanning electron photomicrographs.
SPIDERS (ARANEAE) OF SIX SMALL PEATLANDS IN SOUTHERN ONTARIO OR SOUTHWESTERN QUEBEC
Authors: Dondale Charles D. , Redner James H. 
Published: April 2011

AbstractSix small peatlands, comprising three bogs and three fens, were surveyed for spiders in southern Ontario or southwestern Quebec. Collections from the Mer Bleue bog contained representatives of 108 species (54.6% of the total), those from the Crieff fen 97 (49.0%), those from the Wylde Lake bog 77 (38.9%), those from the Oliver bog 76 (38.4%), those from the Richmond fen 59 (29.8%), and those from the Poltimore fen 49 species (24.8% of the total). The family Erigonidae had 24.8% of the total 198 species, Lycosidae had 11.1%, Linyphiidae had 10.6%, and Salticidae had 9.1%, Web-building species outnumbered hunting species by 118 to 80. The majority of species in these peatlands are wide-ranging litter inhabitants, about one-third are tree, shrub, or herb inhabitants, and one-tenth were found only in or on the surface of the peat itself. Nine of the last-named group appear to be restricted to bogs, but none appear to be restricted to fens.
PHENOLOGY, REPRODUCTIVE BIOLOGY, AND HABITAT ASSOCIATIONS OF NICROPHORUS FAB. (COLEOPTERA, SILPHIDAE) OF THE MER BLEUE BOG AREA (OTTAWA, CANADA)
Authors: Beninger Clifford W. 
Published: April 2011

AbstractRelative abundance of Nicrophorus species sampled with pitfall traps varies between habitats and seasons in the Mer Bleue bog area near Ottawa, Canada. Baited pitfall trapping is useful in studying habitat associations but does not accurately sample reproductively active species. Nicrophorus sayi Laporte is a spring breeding species associated with stands of mature forest. Nicrophorus orbicollis Say and N. tomentosus Weber were taken at baited pitfall traps in all habitats. Nicrophorus defodiens Mannerheim and N. vespilloides Herbst were found primarily in forest and bog habitats, respectively, and did not reproduce outside of these habitats.
PEATLAND SPHAEROCERIDAE (DIPTERA) OF CANADA
Authors: Marshall Stephen A. 
Published: April 2011

AbstractSeventy-three species of the acalyptrate family Sphaeroceridae are recorded from Canadian peatlands, largely on the basis of pan trap samples from peatlands in southern Ontario, the Yukon, and Alberta. Spelobia nana (Rondani), Spelobia ibrida (Roháček), and Trachyopella atomus (Rondani) are newly recorded from North America. Fifteen species are identified as characteristic of peatlands, and their distributions and relationships are discussed. Southern peatland populations of several of these species are interpreted as relict populations in peatlands serving as post-Pleistocene refugia. Some species are known so far only from peatlands along the postglacial fringe.
METHODS FOR MASS-PRODUCTION OF MICROBIAL CONTROL AGENTS OF GRASSHOPPERS AND LOCUSTS
Authors: Jenkins Nina E. , Goettel Mark S. 
Published: April 2011

AbstractThe success of microbial control programmes often depends on an adequate mass-production method for the agent used. The pathogens with potential for use against grasshoppers and locusts vary widely in the ease with which they can be mass-produced. Obligate pathogens such as grasshopper entomopoxviruses, mermithid nematodes and Nosema locustae Canning are currently restricted to culture in living systems. Liquid fermentation is usually employed for the production of non-obligate pathogens such as bacteria, some fungi and nematodes, but in some cases the propagules produced in liquid culture are not amenable to formulation and application. Conidia of hyphomycete fungi can be produced on the surface of liquid media, on solid substrates or in diphasic systems. Production on solid substrates has been adopted for production of steinernematid and heterorhabditid nematodes and some fungi. Diphasic liquid-solid fermentation combines the benefits of both systems and is used mostly for mass-production of hyphomycete fungi such as Metarhizium flavoviride Gams & Rozsypal and Beauveria bassiana (Balsamo) Vuillemin. Increased commercial interest in biological control is likely to accelerate the development of improved and more economical methods for the mass-production of microbial control agents.
ECONOMIC FEASIBILITY OF TWO TECHNOLOGIES FOR PRODUCTION OF A MYCOPESTICIDE IN MADAGASCAR
Authors: Swanson Dan 
Published: April 2011

AbstractThe net present value (NPV) approach to capital budgeting is used to determine the relative economic feasibility of two production models capable of manufacturing a fungi-based biopesticide in Madagascar. Sales revenues are projected at $10–12 per hectare for 20 000–80 000 ha annually, with recurrent costs estimated in Madagascar and investment costs from IITA (Cotonou, Benin) and Mycotech Corporation (Butte, Montana). These cash flows are discounted by an appropriate interest rate and risk factor, with positive results for both the labour-intensive model and the capital-intensive model under several scenarios. Cost advantages for the two models depend on both technology and scale. The labour-intensive model achieves a higher NPV in a market of 20 000 ha per annum as compared with the capital-intensive model. The capital-intensive model achieves a higher NPV in a market of 80 000 ha (including exports to southern Africa). Both models benefit from scale economies, although this benefit is relatively greater for the capital-intensive model. Consumers of mycopesticides in Madagascar could realize nearly 20% savings under a higher output scenario with a capital-intensive technology, than under a lower output scenario with a labour-intensive technology. Large-scale producers, however, would require nearly four times as much investment capital, and could find it difficult to produce for export from Madagascar. In the absence of a large-scale producer, small-scale production would be appropriate and feasible based on lower investment costs. Malagasy production is also protected from foreign competition because of current phytosanitary regulations.
NEMATODES AND NEMATOMORPHS AS CONTROL AGENTS OF GRASSHOPPERS AND LOCUSTS
Authors: Baker Graeme L. , Capinera John L. 
Published: April 2011

AbstractThe relationship of nematodes and nematomorphs with grasshoppers and locusts is reviewed, emphasizing the actual or potential role of these parasitoids in microbial management. There are records of mermithids parasitizing grasshoppers worldwide, and they are considered important biological control agents in some grassland ecosystems of Europe, North and South America, Papua New Guinea, New Zealand, and Australia. Nematomorphs, although widely distributed, are uncommon parasitoids of grasshoppers, and their dependence on free-standing water for host infection and apparent host specificity are considered drawbacks to their use in biological control programmes. The ascaridids, spirarids, and acanthocephalans are parasites of birds and mammals, and may use grasshoppers as intermediate hosts. They have been shown to debilitate grasshopper hosts in laboratory studies, but their primary role as parasites of vertebrates precludes any consideration as biological control agents. Rhabditids do not naturally parasitize grasshoppers, but recent advances in mass-culturing techniques have given them a potential role as bioinsecticides for the control of grasshoppers. Quantitative data on the effects of nematodes and nematomorphs on agricultural pests, including grasshoppers and locusts, are generally lacking. However, there is evidence that some, particularly mermithids, are important in the population dynamics of grasshoppers and locusts. Keys to the identification of the various 'worms' found in grasshoppers and locusts are provided, including keys to the species of mermithids.
SEASONAL PATTERNS OF CADAVER PERSISTENCE AND SPORULATION BY THE FUNGAL PATHOGEN ENTOMOPHAGA GRYLLI (FRESENIUS) BATKO (ENTOMOPHTHORALES: ENTOMOPHTHORACEAE) INFECTING CAMNULA PELLUCIDA (SCUDDER) (ORTHOPTERA: ACRIDIDAE)
Authors: Sawyer A.J. , Ramos M.E. , Poprawski T.J. , Soper R.S. , Carruthers R.I. 
Published: April 2011

AbstractEntomophaga grylli (Fresenius) Batko (North American pathotype 1) is a fungal pathogen of the clearwinged grasshopper, Camnula pellucida (Scudder). We present results from a field experiment conducted in Arizona in 1984, designed to investigate factors associated with seasonal patterns of cadaver persistence and sporulation by E. grylli. Rangeland plots at two sites were monitored daily for 8 weeks for the appearance of new cadavers of diseased grasshoppers during a natural epizootic. Cadavers were individually marked and revisited on subsequent days, when it was noted whether or not conidial sporulation was underway. Environmental variables were recorded by electronic data loggers. Daily probabilities of cadaver disappearance and fungal sporulation were analysed in relation to site, date, and various measures of cadaver status, sporulation history, and environmental variables by logistic regression analysis. The average daily rate of cadaver disappearance was 0.22, yielding an expected time to 50% disappearance of 2.8 days. The environmental factor most significantly associated with cadaver disappearance was rainfall, and the most important host factor was age of the cadaver. The probability that conidia would be discharged from a cadaver over the next 24 h was most dependent on whether or not conidial sporulation was underway already. This probably reflects a state of readiness for sporulation on the part of the fungus. Although the probability of sporulation declined with increasing age of a cadaver, high rates of sporulation were predicted under conditions of prolonged leaf wetness and high humidity at night, regardless of age of the cadaver. These results, together with the observation that in some cadavers sequences of sporulation were interspersed with periods of no sporulation, suggest that E. grylli may undergo cycles of dehydration and rehydration, in which conidial production is interrupted and then resumes in response to changing environmental conditions.
NOSEMATIDAE AND OTHER PROTOZOA AS AGENTS FOR CONTROL OF GRASSHOPPERS AND LOCUSTS: CURRENT STATUS AND PROSPECTS
Authors: Johnson Dan L. 
Published: April 2011

AbstractProtozoa known to infect Acrididae include certain Amoebida (Phylum Rhizopoda), Eugregarinida, Neogregarinida (Phylum Apicomplexa) and at least one species from the Phylum Ciliophora, but are mainly Microsporida (Phylum Microspora). Among the Microsporida,Nosema locustaeCanning has been the most common subject of large-scale field testing as a potential microbial control of grasshoppers and locusts. Although there have been demonstrations of significant impacts of Protozoa such asNosemaspp. on survival, development, reproduction and feeding of grasshoppers and locusts, these candidates have not met the requirements for fast-acting control of Acrididae. However, recently discovered and as yet undiscovered Microspora and other Protozoa may offer reliable non-chemical control of grasshoppers and locusts. Research on candidates such asNosema locustaehas not been wasted effort; at a minimum, research invested toward development of methods of formulation, application, assessment and ecological fate of these potential microbial control agents has provided useful information needed to prepare for the eventuality of discovery of more fast-acting protozoa, and has contributed to development of field methods required for testing of other microbial agents. With improvements in understanding of insect behavioral and physiological responses, satisfactory short-term efficacy (perhaps resulting from combined formulations with behavioral modifiers or stressors) may allowN.locustae,N.cuneatumHenry,N.acridophagusHenry orJohenrea locustaeLange et al. to also serve a role in limiting acridid abundance and activity, either as an agent of biological control in sites requiring special care, or within a rangeland IPM context.