IE50654B1 - Herbicidal compositions containing n-(phosphonomethyl)-glycine - Google Patents

Description

The invention relates to herbicidal compositions containing N-(phosphonomethyl)-glycine or a non-phytotoxic salt thereof, in combination with 2,4-dichlorophenoxyacetic acid or ee-naphthylacetic acid or a non-phy to toxic salt of these compounds.

It is well known from the literature that N-(phosphonomethyl)-glycine can successfully be used for combatting weeds, especially perennial, deeply rooted weeds, but is effective also as a total plant killer /United States Paιθ tent Specification No. 3,799,758/. 2,4-Dichlorophenoxyacetic acid and a-naphthylacetic acid are elso known in the art.

It is the object of the present invention to provide combinations, in which, as a result of using further additives, the herbicidally effective amount of N-(phosphonomethyl)-glycine can considerably be reduced in comparision with the herbicidally effective amount of N-(phosphonoafethyl)-glycine in compositions which contain this compound alone.

The present invention relates to herbicidal compositions comprising an effective amount of a combination of N- (phosphonomethyl)-glycine or a non-phytotoxic salt thereof and 2,4-dichlorophenoxy-acetic acid or anaphthylacetic acid or a' non-phytotoxic salt of these compounds.

The present invention is based on the recognition that the herbicidally effective amount of N-(phosphonomethyl)-glycine or salt thereof can considerably be reduced by using it in combination with 2,4-dichlorophenoxyacetic acid or a non-phytotoxic salt thereof. tfon-phytotoxic salts of H-(phosphonomethyl)-glycine 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, alkaline earth metal salts can also be used.

The herbicidal compositions containing Ii-(phosphonomethyD-glycine as active ingredient are commercially available generally as emulsifiable concentrates containing 30 to 36 % by weight of active Ingredient. They are generally employed at a rate of 10 lit./ha.

The compositions of the invention preferably contain from 0.01 to 95 % by weight of the herbicidally active combination and 5 to 99*9 % by weight of one or more formulation a ids.

The total active ingredient concentration preferably is between 0.1 to 65 % by weight, more preferably between 1 and 40 % weight.

The proportion of N-(phosphonomethyl)-glycine to 2,4-didhlorophenoxyacetic acid or α-naphthylacetic acid can be varied within a wide range. The weight ratio of K-(phosphonomethyD-glycine or salt thereof to dichlorophenoxyacetic acid or salt thereof preferably is between 5:1 end 1:5, more preferably between 4:1 end 1:2.

The proportion of N-(phosphonomethyl)-glycine or salt thereof to α-naphthylacetic acid or salt thereof preferably is between 2:1 and 5:1.

It has surprisingly been found that, using the 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-(phosphonomethyl)-glycine a9 a sole active ingredient. In thia way N-(phosphonomethyl)-glycine can partly be replaced by other agricultural chemicals and its effectcess can be increased.

The formulation aids usable in the compositions according to the invention are additives generally used in the preparation of herbicides and described in detail in numerous textbooks. The formulation aids may for example be inert solid or liquid carriers,diluents, surfactants, e.g. dispersing and emulsifying agents, wetting agents, adhesives, etc.

As diluents for example various hydrocarbon derivatives, mineral oil fractions, vegetable and animal oils, polar solvents, water, etc. can be used. By using these formulation aids the compositions may conveniently be formulated 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 or any other suitable solvent. Suoh concentrates include for example pastes, oily dispersions, emulsifiable concentrates, etc.

Suitable surfactants include salts of ligninsulfonic acid, alkylaryl sulfonates, alkyl sulfates, fatty alcohol sulfates, alkylarylpolyglycol ethers, etc.

The present invention and the best modes of carrying out the invention are illustrated in detail by the following Examples which do not however serve to limit the scope of protection sought.

Example 1 Field trial Test plants: Agropyron repens, Cynodon dactylon and Sorghum halepense (perennial, monocotyledonous weeds) Test compounds: A N-(phoephonomethyl)-glycine E 2,4-dichlorophenoxyacetic acid dimethyl amine salt F α-naphthylaoetic acid Field 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 compound A and 0.9 kg of a compound E or F in 500 lit. of water was applied to one hectare.

Control experiments were carried out also with compositions containing 0.9 kg of compound E and F, respectively.

Evaluation was made 30 days after treatment.

Table 1. Table 1 Plant The results obtained are given in the following Aotive ingredient (kg/ha.) A 1.8 3,6 Ξ o.9 F 0.9 A+S 1.8+0.9 1 A+F ,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 a qo damage 100 a total killing.

Frem the data given above it can be seen that the compositions containing a combination of compounds A and E, and A and F, respectively, have the same effect as the compositions containing N-(phosphonomethyl)-glycine (compound A) alone, in an amount of 3.6 kg. In other words, when using the combination according to the invention the amount of N-(phosphonomethyl)-glycine required to achieve the same herbicidal effect is reduced by 50 %.

Example 2 Field trials Test plants: Agropyron repens, Ciochorium intybus, Plantago media, Cynodon dactylon, Achilles distans> Artemisia vulgaris, Sochus oleraceus.

Test compounds: A N-(phosphonomethyl)-glycine E 2,4-dichlorophenoxyacetic acid dimethyl amine salt Field trials were carried out with the following compositions: A dispersion of 1.08 kg. of compound A and compound E, respectively in 500 lit. of water; and a dispersion of a combination of 0.6 kg. of compound A and 0,2 kg. of oompound E in 500 lit. of water. 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-(phosphonomethyl)-glycinealone, i.e. necessary amount of li-(phosphonomethyl)-glycine can be reduced to about 60 %.

Analogous tests were also carried out on Agropyron repens, Achilles distans, Artemisia vulgaris, Cynodon dactylon, Plantago media and Sonchus oleraceus. If was found that a dispersion of 1.8 kg. of N-(phosphonomethyl)-glycine in 500 lit. of water resulted in killing of 70 % of the weeds 30 days after treatment, while whan also adding 10, and 40 % by weight of 2,4-dichlorophenoxyecetic acid to the compositions, the weed-killing was about 85 to 95 %· Example 3 Emulsifiable concentrates Ingredients Amount (parts ty weight) 1:1 mixture of K-(phosphonoaethyl)-glycine end 2,4-dichlorophenoxyacetic acid dimethyl amine salt 10 Isooctvlphenol polyglycol ether 10 Water 80 The mixture obteined by admixing the ingredients,· optionally immediately before applicetion, is diluted with water to the desired concentration.

Example 4 Aqueous dispersion Ingredients Amount (parts by weight) 2:1 mixture of IT-(phosphonometbyl)-glycine and 2,4-dichlorophenoxysoetic acid dimethyl amine salt 3° Xylene ®θ Ethyleneoxide-oil ecid H-monoetbanol amide addition product 10 Dodecylbenzenesulfonic acid Ca 5 Ethyleneoxide-castor oil addition product 5 The dispersion obtained by admixing the ingre· clients is diluted with 100 000 parts Example 5 Tank mixture by weight of water. Ingredients Amount (parts by weight) 1:2 mixture of H-(phosphonomethyl)-glycine and 2,4-dichlorophenoxy- acetic acid dimethyl amine salt 2,4-dichlorophenoxyacetic acid 10 dimethyl amine salt 10 lignin sulfonic acid Ha 10 The mixture obtained by admixing the ingredients is diluted with 10 000 parts by weight of water. The tank mixture contains 0.1 % weight of active ingredient.

Claims (9)

1. Herbicidal compositions comprising an effective amount of a combination of N-(phosphonomethyl)-glycine or a non-phytotoxic salt thereof and 2,4-dichlorophenoxyacetic acid or α-naphthylacetic acid or a non-phytotoxic salt of these compounds.

2. Compositions as claimed in claim 1 containing a combination of N-(phosphonomethyl)-glycine or a salt thereof and 2,4-dichlorophenoxyacetic acid or a salt thereof.

3. Compositions as claimed in claim 2 wherein the weight ratio of N-(phosphonomethyl)-glycine or salt thereof to 2,4-dichlorophenoxyacetic acid or salt thereof is between 5:1 and 1:5.

4. Compositions as claimed in claim 3 wherein the weight ratio of N-(phosphonomethyl)-glycine or salt thereof to 2,4-dichlorophenoxyacetic acid or salt thereof is between 4:1 and 1:2.

5. Compositions as claimed in claim 1 containing a combination of N-(phosphonomethyl)-glycine or a salt thereof and α-naphthylacetic acid or a salt thereof.

6. Compositions as claimed in claim 5 wherein the weight ratio of N-(phosphonomethyl)-glycine or salt thereof to α-naphthylacetic acid or salt thereof is between 2:1 and 5:1.

7. Compositions as claimed in any one of claims 1 to 6 containing from 0.01 to 95% by weight of said herbicidally active combination and 5 to 99.9% by weight of one or more formulation aids.

8. A composition as claimed in claim 1 substantially as described herein in any one of the Examples.

9. The use of a composition as claimed in any one of the preceding claims as a herbicide.