IL28747A - Synergistic preparations for combating weeds in grain,maize and soya fields,containing two substituted phenylureas - Google Patents

Description

28747/2 o»o © o»awy mam* ο»»ίο υ»ο o»*i»tton Synergistic preparations for combating weeds in grain, maize and soya fields, containing two substituted phenylureas GIBA-GEIGY AG Cs27300 . 28747/2 The present invention relates to preparations containing the urea of the formula in admixture with the urea fluometuron of the formula Mixtures of the active principle of formula (I) and the active principle of formula II have a synergistic action when used for the selective control of undesirable plant growth in grain, maize and soy<¾ fields.

The N- 4-bromo-J-chorophenyl- 1 -methyl-N 1 -methoxyurea may be obtained by brominating 3-chlorophenyl-N 1 -methoxy-N ' -methylurea, in a solvent for example, in glacial acetic acid. When recrystallized from acetonitrile , it melts at 94 . 5 to 95 . 5°C. Its solubility in water at 20°C is about 50 ppm. The determined in the rat by oral administration, is about 2 , 500 mg/kg. The acute dermal determined on the rabbit, is greater than 10 g/kg.

The N- 3-trifluormethylphenyl-N 'N-dimethylurea , fluormet^uron (II) has been described in the Israel Patent specification No. 16 325 .

Both Active Principle (I) and Active Principle (II) are used for weed control in grain.

Active Principle (II) is effective mainly against gra weeds, whereas Active Principle (I) is effective mainly against broad-leaf weeds.

The following table shows the action of the single components and the action of a mixture of the two aotive principles: Active Grass weeds Broad-leaf weeds principle Experiment Experiment Experiment Experiment 1 2 1 2 II 0.5 kg 6 5 9 9 active principle 0.75 kg 5 5 8 7 active principle 1.00 kg 4 . 4 8 7 active principle I 0.5 kg 8 8 5 5 active principle 0.75 kg 7 8 j 4 3 active principle 1.00 kg 6 6 active ? 3 principle I + II . 0.25 kg + 0.5 kg 4 3 2 0.5 kg + 0.5 kg 3 2 2 Key: 1 = 100$ kill 9 = no effect on weeds Commentary: A mixture of 0.5 kg of Active Principle (I) r which has no effect on grass weeds, and an amount of Active Principle (II) which is insufficient to be effective alone against grass weeds leads to effective control of grass weeds. The same applies to broad-leaf weeds. , . the mixture and ( II } The active principle/of the formula (I)/may be used either alone or in admixture with additives, for example, solvents, diluents, dispersing agents, wetting agents, fertilizers, adhesives and, if desired or required, other selective herbicides.

Thus, the active principle of the formula (I)?—i£ n««^&ear-y-> in combination with the active principle of the formula (II) , can be incorporated in a very wide variety . of preparations, some of which are given in the following:- 15 Solutions use$ directly for spraying contain, for example, mineral oil fractions having a high to medium boiling range, preferably above 100°C, for example, diesel oil or kerosene, coal-tar oils and oils of vegetable or animal origin, and, lso hydrocarbons, for example, alkylated naphthalenes, tetrahydr,onaphthalene, xylene mixtures, cyclohexanols and, if necessary, ketones or chlorinated hydrocarbons, for example, tetrachloroethane, trichloroethylene, , trichlorobenzene and ■;tetrachlorobenzene· Aqueous preparations are prepared, for example, from emulsion concentrates, pastes or we table powders for sprays by the addition of water. Suitable emulsifying agents or dispersing agents are, for example, non-ionic products, for example, condensation products obtained from aliphatic 50 alcohols, amines or carboxylic apids having a long-chain < ί ϊ hydrocarbon radical containing about 10 to 20 carbon atoms and ethylene oxide', for,^example, the condensation product 1 obtained from octadecyl alcohol and 25 to 30 mols of ethylene oxide, or that obtained from soybean fatty acid and 30 mols of ethylene oxide, or that obtained from technical oleylamine' and 15 mols of ethylene oxide or that obtained from dodecylmercaptan and 12 mols of ethylene oxide. However, it is also possible to use condensation products obtained from ethylene oxide and hydroaromatic polycyclic carboxylic acids or amines.

Anionic emulsifying agents that may; be used are, for example, the sodium salt of dodeqylalcohol sulphuric acid ester, the sodium salt of dodecylbenzene, sulphonic acid, the potassium or triethanolamine salt of oleic acid or abietic acid or mixtures of these acids, or the sodium salt of a petroleum sulphonic acid. \ As cationic dispersing agents, there may be used quaternary ammonium compounds, for example, cetylpyridinium bromide or dihydroxyethylbenzyl-dodecylammonium chloride.

Dusting and screwing preparations may be prepared with solid carrier substances, for example, talcum kaolin, bentonite, calcium carbonate and calcium phosphate, and also with charcoal, cork meal, wo.od meal and other materials of vegetable origin. The preparations in their various forms may also contain the usual. additives which improve dispersion, adhesion and penetrating power; substances of the kind mentioned ;are, for example, fatty acids, resins, . glues, casein or alginates.

The following; Example^ illustrate^the invention, the parts being by weight. 28747/2 EXAMPLE" a) 20 Parts of Active \ mixture - are dissolved in a mixture comprising 48 parts of diacetonealcohol, 16.5 parts of xylene and ΐβ parts of a condensation product obtained from ethylene oxide and a higher fatty acid, for example, that obtained from soybean fatty acid and 30 mols of ethylene oxide. This concentrate can be diluted with water to produce emulsions of any .desired concentration. b) 80 Parts of Active : mixture are mixed with parts of a wetting agent, for example, the sodium salt of butylnaphthalene-sulphonic acid, 1 to 3 parts of a protective colloid, for example, sulphite cellulose waste liquor, and 15 parts of a solid, inert carrier substance, for example, kaolin, calcium carbonate or kieselguhr, and the batch is finely ground. The wettable powder .so obtained may be mixed with water before use and produces a suspension ready for application. c) 15 Parts of Active mixture are dissolved in 90 parts of coal-tar oil, Diesel oil or spindle oil.

Solutions are obtained which are ready for use. d) 80 Parts of Active mixture' , 10 parts of sulphite cellulose waste liquor, 8 parts of talcum and 2 parts of the condensation product obtained from para-octylphenol and 18 mols of ethylene oxide are mixed together and the mixture is finely ground. The powder so obtained is suitable for use as a spray, and may be diluted with water as required. 28747/2 - Ί -

Claims (6)

1. A preparation for selective control of weeds in grain, maize and soya crops¾ which comprises the .compound of the formula in admixture with the compound of the formula

2. A preparation as claimed in Claim 1, wherein there is also present a suitable carrier substance.

3. A preparation as claimed in Claim 1 or 2, wherein the ratio of the first mentioned compound to the second mentioned compound present is within t e range of from 0.5 : 1 to 1 : 1.,

4. A preparation as claimed in Claim 1, and substantially as described in the Examples and Tables herein. grain, maize and soya

5. A method of selectively combating weeds in a/crop area, which comprises treating the crop area wi.th a preparation as claimed in Claim 1. grain, maize and soya

6. A method of selectively combating weeds in a/crop area, which comprises treating the crop area with a preparation as claimed in Claim 1 or 2. p > w the Applicants