FI57337B - SAMMANSAETTNING FOER BEKAEMPNING AV VILDHAVRE - Google Patents

Description

Γηΐ I ^ UULUTUSJULICAISU C9TT9 jCT »W ^ UTUAdCNINetSKIUFTÖ / JSy

Jra® C (45); ^ (51) KY.ik.Va.3 A 01 H 37/4 * FINNISH — FINLAND (21) N * «i * tii» k «i« ui ~ f «« it «irtki *» * 750908 (22) H »k * mtop« M — Aweknlngrftg 26.03.75 '' (23) Alkupllvt — Giltlgh «t * daf 2g 03.75 (41) Interpreters Public — or —BHvtt offutMg j_q

PaUnUi and the National Board of Registers / 44) ΝίΜΜίαΐριηοη | «kutiLjuikaiuun date—

Patani och registerstyrelsen 'Amaku utk «d oeh uti ^ rNtM puMiwnd 30.0U.80

(32) (33) (31) Pn4 * tt) T «moHcMii — feflrd prteritvt 01. oU. 7U

England-England (GB) 1U291 / 7U

(71) Shell International Research Maatschappij BY, Carel van Bylandt-laan 30, The Hague, The Netherlands (NL) (72) Alan John Sampson, Sittingbourne, Kent, England-England (GB) (7U) Oy Kolster Ab (5U) This invention relates to a composition comprising (A) U-chloro-2-butyl-γ-tynyl-N- (3-chlorophenyl) carbamate and (B) methyl N-benzoyl-N - (3-chloro-U-fluorophenyl) -2-aminopropionate and which composition has a synergistic herbicidal effect for controlling the growth of waste oats and a method for destroying waste oats from a cereal crop using this composition.

Oatmeal (Avena fatua) causes significant weed problems everywhere and is widespread and numerous among cereal seeds.

As a result, the annual economic losses caused by waste oats are considerable.

One herbicide that can be used to control oatmeal is lt-chloro-2-butynyl-m-chlorocarbanilate, commonly known as "Barban". In suitable, relatively small doses, it effectively inhibits the growth of wasted oat seedlings without significantly impeding the growth of cereals (wheat, barley). However, it has the disadvantage that it is only effective if it is used for waste pots in their initial development phase. If it is used at a later stage in the development of the trout, for example after the 2 1/2 leaf stage, its effectiveness against wasted oat seedlings is significantly reduced. Thus, when using "Barban", the farmer, di · £ · "2 57337, must carefully monitor the growth of wasted oats and use Barban at its appropriate critical stage of development. Weather conditions can cause considerable difficulty during this critical phase, because if it rains or the soil is wet, it may be difficult or impossible to use the deflection against wasted oats during the critical period. As an additional difficulty, if one or more protection seasons occur during a cold weather period, some of the oat seeds germinate in each protection period, with several stages of development in the growth of the oats. When this occurs, Barban must be applied several times, as each dose is effective only on plants in their early stages of development. Numerous dosages are undesirable because more herbicide is required, increasing the farmer's workload and downtime.

Another herbicide for controlling waste oats in cereal crops is methyl N-benzoyl-N- (3-chloro-U-fluorophenyl) -2-aminopropionate, hereinafter referred to as "propionate ester". This is a more versatile herbicide because it is effective when applied to waste oatmeal from their 3-leaf stage to the air delivery stage of the joints.

Surprisingly, it has now been found that oatmeal can be effectively controlled at several stages of its development by using a combination of bias and propionate ester in significantly lower dosage amounts than are required for both compounds alone.

The present invention provides a herbicidal composition for controlling waste oats comprising (A) U-chloro-2-butynyl N- (3-clopriphenyl) carbamate of formula

Cl (B) methyl N-benzoyl-N- (3-chloro-U-fluorophenyl) -2-aminopropionate of formula

O

V ° \ CH I 3

N-CH-CCLCH

ö F Cl And (C) a carrier or surfactant or both a carrier and a surfactant.

iV '»" *' 3 57337

Experiment with numerous different dose levels shows that such a combination has a synergistic herbicidal effect on oatmeal. Even more surprising is the fact that as the herbicidal effect of the combination increases relative to wasted oats, there is no corresponding increase in the effect of the combination on cereals so that the combination can be used safely in fields sown with cereal seeds.

By means of the present invention, it is possible to control the growth of waste oats at all stages of its development by applying the composition to the leaves of the oats after the presence of the waste oats. The growth of oats can even be controlled in cereal seeds by applying 1 + 00-2000 g per hectare of a composition containing 1-1 + parts by weight of propionate ester as active ingredients.

The preferred composition, which has a very strong herbicidal action in relatively small doses, contains 32-61 + g of Barban and 32-61 + 0 g of propionate ester. This composition is preferably applied at 1 + 00-100 g per hectare.

Barba can be easily prepared, as disclosed in British Patent 916. The propionate ester, methyl N-benbaoyl-N- (3-chloro-1 + -fluorophenyl) -2-aminopropionate can be prepared by the method described in British Patent 1,161 + 160.

The herbicidal composition of the invention uses a carrier, surfactant, or both carrier and surfactant to facilitate application of the composition to soil contaminated with waste oats in the desired dosage amounts. The term "carrier" as used herein means a solid or liquid substance, which may be an inorganic lice of organic origin and of synthetic or natural origin.

Typical solid carriers include natural and synthetic clays and silicates, for example natural silicates such as diatoms and aluminosilicates, for example kaolinites, montmorillonites and mica.

typical liquid carriers include ketones, for example methylcyclohexanone, aromatic hydrocarbons, for example methylnaphthalenes, rock oil fractions, such as petroleum xylenes and light rock oils, and chlorinated hydrocarbons, for example carbon tetrachloride. Mixtures of liquids are often suitable.

One or more surfactants and / or fixatives may be added to the composition. Surfactant or. slide emulsifier or dispersant or wetting agent, it may be non-ionic or ionic. Any surfactant commonly used in the preparation of herbicides or insecticides may be used. Examples of suitable surfactants are the sodium or calcium salts of polyacrylic acids and ligninsulphonic acids, the condensation products of fatty acids or aliphatic amines or amides having at least 12 carbon atoms in the molecule with their esters of ethylene oxide and / or propylene oxide, glycerol, sorbitan, 57337 with oxide and / or propylene oxide, condensation products of fatty alcohols or alkylphenols, for example p-octylphenol or p-octylcresol, with ethylene oxide and / or propylene oxide, sulphates or sulphonates of these condensation products, containing at least 10 carbon atoms in the molecule or alkali or alkaline earth metal salts of sulfonic acid esters, preferably the sodium salt, for example sodium lauryl sulphate * alkyl sulphates of the sodium secondary, sodium salts of sulphonated castor oil and sodium alkylaryl sulphonates, such as triododecylbenzenesulfonate and polymers of ethylene oxide and copolymers of ethylene oxide and propylene oxide.

Aqueous dispersions and emulsions, for example compositions obtained by diluting a composition powder or concentrate according to the invention with water, are also within the scope of the invention. Said emulsions may be of the "water-in-oil" or "oil-in-water" type and their consistency may correspond to thick mayonnaise.

The fluffy compositions of this invention can be applied to waste oat plants in a conventional manner. Dusts and liquid compositions can be conveniently applied using power sprays, hand and hand sprayers, and spray sprays. The compositions may also be applied from aircraft as dust or mist based on the efficacy of low doses of the compositions.

The invention is further illustrated by the following example.

Example greenhouse experiment

John Innes No. 1 7 cm pots containing compost were seeded with 25-30 wheat, barley and waste oat seeds. When the seedlings had reached 1 to 1 1/2 leaf stage, the solution containing the test mixture was sprayed with a logarithmic dilution syringe at five different doses for each species.

Five mixtures containing different amounts of compounds were injected in five doses each.

Evaluations were performed 10-15 days after injection. Barley and wheat seedlings were cut from ground level and plant weight was expressed as a percentage of the weight of untreated barley. The percentage decrease in growth of waste oat seedlings was determined visually. These values were analyzed by computer to calculate the growth inhibitory dose that causes a 10% decrease in wheat, a 110% decrease in barley, and a 90% decrease in waste oats, using the abbreviations GID ^ wheat (a), GID ^ barley (h), respectively. and GID ^ waste oats (c). The selectivity factor (S.F.) of the test compound can be calculated using the following expressions: GID Q-barley GID ^ ^ wheat S.F. = - »- f or S.F. - * - G ID ^ q-waste oats GID ^-waste oats

The selectivity factor provides a reference value for the selective herbicidal activity of the mixtures or compounds tested. The higher the selectivity factor, the better the selectivity achieved between the two plant species.

IS

\ r> ·.

5,57337

Mixtures of propionate ester and barbarine were tested using the above methods. The two compounds and their mixtures were applied at doses ranging from 8.0 kg / ha to 0.6 kg / ha for wheat, 7.0 to 0.5 kg / ha for barley and 4.0 to 0.2 kg / ha for oats. . The range of mixtures used and the results obtained are shown in the following table.

Table

Results of experiments using mixtures of bias and propionate ester

Relationships GID, Q GID.-. GIDg0 Selectivity- Selectivity- kg / ha viii coefficient coefficient - Λ wheat barley waste oats ...

Propio- / v / v wheat barley naate bar- ^ (a) / fc) (b) / (c) ester ban s 8.0 0.0 0.606 0, Section 4o8, 04 0.30 0.20 5.0 3.0 1 .51 + 0.704 2.00 0.77 0.35 4.0 4.0 1.20 1.09 2.34 0.51 0.47 3.0 5.0 1.42 0.904 2.83 0.50 0.32 0 .0 8.0 1.14 0.877 8.50 0.13 0.10 These figures show that the effect of the mixtures on the grain qualities was less than that of the hot compound alone. In wasted oats, the effect does not decrease as rapidly as would be expected, as an increase in the Barban dose indicates a synergistic effect. When two GID values are used together to express selectivity, mixtures are found to be significantly more effective than individual products. In this experiment, a ratio of propionate ester to barban in the range of 2: 1 to 1: 1 gives the best results.

u., r

Claims (2)

57337 6 Herbicidal composition for controlling waste oats, characterized in that it contains: (A) 1 + chloro-2-butynyl N- (3-chlorophenyl) carbamate of the formula V y-NH-CO 2 CH 2 s = CCH 2 Cl and Cl ( B) methyl N-benzoyl-N- (3-fluoro-1-fluorophenyl) -2-aminopropionate of the formula QV ° \ fb N-CH-CO 2 CH 3 O F Cl and (C) a carrier or surfactant substance or both a carrier and a surfactant. Herbicidal composition according to Claim 1, characterized in that it contains 1 to 1 + parts by weight of component (A) and 1 to 20 parts by weight of component (B). *