HERBICIDAL COMPOSITIONS CONTAINING N-(PHOSPHONOMETHYL)-GLYCINE

Abstract: Herbicidal compositions containing N-(phosphonomethyl)-glycine or a non-phytotoxic salt thereof, in combination with 2,4-dichlorophenoxyacetic acid or -naphtylacetic acid or non-phytotoxic salt of these compounds. By using the compositions according to the invention the herbicidally effective amount of N-(phosphonomethyl)-glycine can considerably be reduced in comparison with the commercially available compositions, which contain N-(phosphonomethyl)-glycine as an only active ingredient.

Description: IΪERBICIDAL COMPOSITIONS CONTAINING N-(PHOSP. ONO ETHYLJ- -GLYCINE TECHNICAL FIELD The invention relates to herbicidal compositions containing N- phosphonomethylJ-glycine or a non-ph otoxic salt thereof, in combination with 2,4-dichlorophenoxyacetic acid or cc-naphthylacetic acid or a non-phytotoxic salt of these compounds, BACKGROUND AΛT It is well knovn from the literature that N- phos- phonomethylJ-glycine can successfully be used for combatting weeds, especially perennial, deeply rooted weeds, but is effective also as a total plant killer /United States Pa¬ tent .Specification No. 3,799,758/. 2,4-Dichlorophenoxyacetic acid and α-naphthylace- tic acid are also known in the art. It is the object of the present invent;ion to pro¬ vide combinations, in which, as a result of using further additives, the herbicidally effective amount of N- phos- phonomethylJ-gl cine can considerably be reduced in compa- rision with the herbicidally effective amount of N-.phos- phonomethyl -glycine in compositions, which contain this compound alone. DISCLOSURE OP THE INVENTION The present invention relates to herbicidal com¬ positions comprising a combination of N-.phosphonomethylJ- -glycine and 2,4-dichlorophonoxyacetic acid or -naphthyl- ace ic acid or a non-phytotoxic salt of these compounds, in an effective amount. The present invention is based on the recognition that the herbicidally effective amount of N-^phosphonome hyl -glycine or a salt thereof can considerably be reduced by using it in combination with 2,4-dichlorophenoxyacetic acid or a non-phytotoxic salt of these compounds. Non-phytotoxic salts of N-(phosphonomethylJ-gly- cine preferably include alkyl amine salts, preferably having . from 1 to 4 carbon atoms. The preferred salts of 2,4-dichlorophenoxyacetic acid also include alkyl amine salts, preferably having from 1 to 4 carbon atoms, e.g. isopropyl amine, dimethyl amine salts, etc., but other salts, e.g. alkali metal, alkali earth metal salts can also be used. The herbicidal compositions containing N- phos- phonomethylJ-glycine as active ingredient are commercially available generally as emulsifiable concentrates contain¬ ing 30 to 6 % by weight of active ingredient. They are generally employed at a rate of 10 lit./ha. The compositions according to the invention con- tain from 0.01 to 95 % by weight of the herbicidally active combination and 5 to 99.9 % by weight of one or more for¬ mulation acids. The total active ingredient concentration pre erab¬ ly is between 0.1 to 85 % by weight, more preferably between 1 and 40 % weight. The proportion of N- phosphonomethylJ-glycine to 2,4-dichlorophenoxyacetic acid or α-naphthylacetic acid can be varied within a wide range. The weight ratio of N-(phos- phonomethylJ-glycine or a salt thereof to dichlorophenoxy- acetic acid or a salt thereof preferably is between 5:1 and 1:5, more preferably between 4:1 and 1:2. The proportion of 11-(.phosphonomethylJ-glycine or a salt thereof to α-naphthylacetic acid or a salt thereof preferably is between 2:1 and 5:1. It has surprisingly been found that of the her¬ bicidal compositions according to the invention a smaller amount is required to obtain the same herbicidal effect than of the commercially available compositions, which contain N-^phosphonomethylJ-glycine as*a sole active in¬ gredient. In this way N-^phosphonomethyl -glycine can partly be replaced by other agricultural chemicals and its effecti- vity can be increased. The formulation aids usable in the compositions according to the invention are additives generally applied in the preparation of herbicides and described in detail in numerous texbooks. The formulation aids may for example be inert solid or liquid carriers, diluents, surfactants, e.g, dispersing and emulsifying agents, we ting agents, adhesi- ves, etc. As diluents for example various hydrocarbon deriva¬ tives, mineral oil fractions, vegetable and animal oils, polar solvents, water, etc. can be used. By using these for¬ mulation aids the compositions may conveniently be formulat- ed as solutions, emulsions and dispersions. The compositions according to the invention may also be formulated as concentrates, which can be diluted in the place of application with water of any other suitab¬ le solvent. Such concentrates include for example pastes, oily dispersions, emulsifiable concentrates, etc. Suitable surfactants include salts of lignin- sul onic acid, alkylaryl sulfonates, alkyl sulfates, fatty alcohol sulfates, alkylarylpolyglycol ethers, etc. BEST MODE OP CARRYING OUT THE INTENTION The present invention and the best modes of carry¬ ing out the invention are illustrated in detail by the fol¬ lowing Examples which do not however serve to limit the scope of protection sought. Example 1 PieId trial Test plants: Agropyron repens, Cynodon dactylon and Sorghum halepense ^perennial, monocotyledonous weedsJ Test compounds: A N-(phosphonomethylJ-glycine E 2,4-dichlorophenoxyacetic acid dimethyl amine salt P α-naphthylacetic acid Pield trials were carried out with the following compositions: A dispersion of 1.8 and 3.6 kg of compound A in 500 lit. of water is applied to one hectare. In another test a dispersion of 1.8 kg of a com¬ pound A and 0.9 kg of a compound E or P in 500 lit. of wate was applied to one hectare. Control experiments were carried out also with compositions containing 0.9 kg of compound E and P, respec- tively. Evaluation was made j>0 days after treatment. The results obtained are given in the following Table 1. Table 1 Plant Active ingredient (.kg/ha.J A E _' A+E A+P 1.8 3,6 0.9 0.9 1.8+0.9 1.8+0.9 Agropyron repens 65 100 0 0 100 100 Cynodon dactylon 60 95-100 0 0 100 100 Sorghum halopense 65 100 0 0 100 100 0 = no damage 100 = total killing. Prom the data given above it can be seen that the compositions containing a combination of compounds A and E, and A and P, respectively, have the same effect as the compositions containing N-(phosphonomethylJ-glycine (compound AJ alone, in an amount of 3.6 kg. In other words, when using the combination according to the invention the amount of N-(phosphonomethylJ-glycine required to achieve the same herbicidal effect is reduced by 50 . Example 2 Pield trials Test plants: Agropyron repens, Ciochorium intybus, Plantago media, Cynodon dactylon, Achilles distans, Artemisia vulgaris, Sochus oleraceus. Test compounds: A N-(phosphonomethylJ-glycihe E 2,4-dichlorophonoxyacetic acid dimethyl amine salt Pield trials were carried out with the following compositions: A dispersion of 1.08 kg. of compound A and com¬ pound E, respectively in 500 lit. of water; and a disper¬ sion of a combination of 0.6 kg. of compound A and 0.2 kg. of compound E in 500 lit. of water. 45 days after spraying it was established that the composition containing a combination of the compounds A and E had the same herbicidal effect on all test plants as the composition containing N-^phosphonomethylJ-glycine alone, i.e. necessary amount of N-i,phosphonomethylJ-glycine can be reduced to about 60 "/-. Analogeous tests were carried out also Agropyron repens, Achilles distans, Artemisia vulgaris, Cynodon dac¬ tylon, Plantago media and Sonchus oleraceus. If was found that a dispersion of 1.8 kg. of N-(phosphonomethylJ-glycine in 500 lit. of water resulted in killing of 70 % of the weeds 30 days after treatment, while when adding also 10, 20 and 40 L /o by weight, respectively of 2,4-dichlorophenoxy¬ acetic acid to the compositions, the weed-killing was about 85 ' to 95 fr. Example 3 E ulsifiable concentrates Ingredients Amount (parts by weight 1:1 mixture of N-(phosphonomethylJ- -glycine and 2,4-dichlorophenoxy¬ acetic acid dimethyl amine salt 10 lsooctylphenol polyglycol ether 10 Water 80 The mixture obtained by admixing the ingredients, optionally immediately before application, is diluted with water to the desired concentration. Example 4 Aqueous dispersion Ingredients Amount (parts by weightj 2:1 mixture of N-(phosphono- methylJ-glycine and 2,4-di¬ chlorophenoxyacetic acid di¬ methyl amine salt 30 lylene 80 Ethyleneoxide-oil acid N-monoethanol amide addition product 10 Dodecylbenzenesulfonic acid Ca 5 Ethyleneoxide-castor oil addition product The dispersion obtained by admixing the ingre¬ dients is diluted with 100000 parts by weight of water. Example 5 Tank mixture Ingredients Amount (parts by weightJ 1:2 mixture of N-(phosphonomethylJ- -glycine and 2,4-dichlorophenoxy¬ acetic acid dimethyl amine salt . 10 2,4-dichlorophenoxyacetic acid dimethyl amine salt 10 ligninesulfonic acid Na 10 The mixture obtained by admixing the ingredients is diluted with 10000 parts by weight of water. The tank mixture contains 0.1 % weight of active ingredient.

Claims: AMENDED CLAIMS ( received by the International Bureau on 12 June 1981 (12.06.81)) 1. (amended) Herbicidal compositions comprising a combination of N-(phosphoπomethyl)-glycine or a non- -phytotoxic salt thereof and A) 2,4-dichlorophenoxyacetic acid or a non- -phytotoxic salt thereof, in a weight ratio of between 5:1 and 1:5; or B) cc-naphthylacetic acid or a non-phytotoxic salt thereof, in a weight ratio of between 2:1 and 5:1. 2. (cancelled) 3. (cancelled) 4. (amended) Compositions as claimed in claim 1 wherein the weight ratio of N-(phosρhonomethyl)-glycine or a salt thereof to 2,4-dichlorophenoxyacetic acid or ' a salt thereof is between 4:1 and 1:2. 5. (cancelled) 6. (cancelled) 7. (amended) Compositions as claimed in claim 1 or claim 4 containing from O.Ol to 95 % by weight of said herbicidally active combination and 5 to 99.9 Cf by weight of one or more formulation aids.

Inventors: BARACSKAI JOZSEF, FODOR FERENC, GAAL ANTAL, GIMESI ANTAL, HORVATH ANDREAS, KOLONICS ZOLTA N, BARACSKAI J, FODOR F, GAAL A, GIMESI A, HORVATH A, KOLONICS Z
Applicants: BARACSKAI J, FODOR F, GAAL A, GIMESI A, HORVATH A, KOLONICS Z, NITROKEMIA IPARTELEPEK, NOEVENYVEDELMI KUTATO INTEZET
Application year: 1980
Main classification: A01N57
IPC codes: A01N37, A01N39, A01N57