JPS6193103A - Herbicidal composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synergistic herbicidal composition, a process for its preparation and the use of the composition to kill weeds in agriculture.

The present invention relates to N-(2'-ethyl-61-methyl-phenyl)-N-ethoxymethyl-2-chloro-acetamide (acetochlor) and 2-nitro-1-(4-nitro-phenoxy)-4-tri Based on the recognition that fluoromethyl-benzene (fluorodifen) does not exhibit synergistic effects.

The active ingredients of the synergistic herbicidal compositions according to the invention are known per se. U.S. Patent No. 3,442 for the manufacture of acetochlor
．． No. 945 and the production of fluorodienes is disclosed in British Patent No. 1.033.163.

Conventionally, herbicidal compositions containing chloroamino triazine have been widely used to kill weeds that occur during maize cultivation. A disadvantage of this herbicidal composition is that it is inactive against several species of monocotyledonous weeds. This is because this weed, like maize, can detoxify herbicidal active ingredients.

(Goo. I, N, Jensen, G, R.

Steffensen and Elle, Nee, Hunt, "Detoxification of Atrazine Inslee Gramineae Subfamilies" (Weed Science) Chambein, ■,.

1977,. See Vol. 25, pp. 212-220. ) Next to maize is Panicum miriasum, which can be made non-toxic even with the herbicide atrazine.
1iliaceua+), which is why this weed strain is so rampant. None of the herbicides commonly used in maize cultivation (thiourea and urea derivatives, acetanilide, etc.) are sufficiently effective against Panicum miliariasum.

Several efforts have been made to weed out the above dangerous weed species and various compositions and biological treatments have been elaborated. However, promising results were obtained only with post-emergence treatment.

It is an object of the present invention to provide herbicidal compositions and methods suitable for weeding the Vanicum miliariasum weed species.

It is surprising that the combination comprising acetochlor and fluorodifen in the proportions exhibits a herbicidal effect which is superior to the sum of the effects of the components used alone, i.e. the compositions of the invention are synergistic. I understood.

According to the invention, N-(2'-ethyl-61-methyl-phenyl)-N-ethoxymethyl-2 is mixed with the customary inert solid or liquid carriers and auxiliaries as active ingredient.
-chloro-acetamide and 2-nitro-1-(4-
A herbicidal composition is provided comprising a 1:4 to 2.3:1 mixture of (nitro-phenoxy)-4-trifluoromethyl-benzene in a total amount of 1 to 90% gravitation water.

Liquid carriers are aliphatic and/or aromatic hydrocarbons, alcohols, ketones, esters, preferably xylene or cyclohexanone. The solid carrier is any suitable natural mineral, preferably silicic acid, china clay, kaolin, ground limestone and/or synthetic silicates.

The compositions of the present invention may contain suitable wetting and/or dispersing agents, non-ionic and/or anionic surfactants, lignin sulfonic acid derivatives, adhesives or selectivity modifiers, and the like.

The compositions of the invention can be made into any suitable form applicable to agriculture or horticulture, such as water-emulsifiable concentrates, wettable powders, fine powders, granules, and the like.

Emulsifiable concentrates and wettable powders can be diluted with water to provide an instant spray, while granules can be applied directly onto the soil and used in a pre-emergence mode. The optimum volume for optimal use is approximately 1 ml of total active ingredients/hectare under cultivation conditions.

The compositions according to the invention are preferably used for weeding monocot weeds without damaging cultivated plants. The composition is particularly useful in maize cultivation due to its selective activity against Panicum milliasum.

Activity tests are carried out using customary and well-known methods (L. Banki, ``Bioassays of Vestaside Ind.
The Laboratory”, Academia Chiato, Adapest. 1
978. pp. 292-302; Che. Gee, Horsfal (1945).

"Fungesize and There Action".

Walsem, Mass Ninisny Rironic Botanica: Scandari (1962),
Zolfuo o Politurflo di Barrio o Chilam”, Nochis Marat, Brunch 61.3-35.3
7-48° 53-69°) These methods involve the simultaneous - i.e. synergistic, additive or reciprocal - combination of two biologically active compounds.
Particularly suitable for measuring effectiveness.

Figure ■ shows the following activity data for acetochlor (A) and fluorodifen (F) against Panicum miliariasum: measured activity of the ingredients when used alone, - expected effect (
(based on the measured effect of a single one), - the measured activity of a combination of two components.

From FIG. 1, it can be seen that the measured activity of the combination is more than 30% higher than the expected value, which proves that it is a synergistic surplus effect.

The unexpected and surprising advantage of the synergistic composition of the present invention is that it is very effective and safe against Panicum miliariasum in maize cultivation by using relatively small pesticidal doses with little damage to the cultivated plants. It lies in the fact that post-emergence protection can be provided.

Further details of the compositions of the invention and their biological activity are given in the following non-limiting examples which do not limit the scope of protection.

Example 1 Greenhouse test in a cultivation pot 9 Kg of a 1=1 mixture of arable soil and sandy loam is placed in a cultivation pot (30X30X30cIR).
0 MVSC 1295 (FAO 200) maize hybrid and 100 Vanicum miriasum weed seeds are sown in each pot at a depth of 4cI+ and 2α, respectively. The soil surface has the components disclosed in Table 1, 50% by weight
An emulsion prepared by diluting an emulsifiable concentrate (EC) containing the active ingredient with water is sprayed.

mm and activity test results are summarized in Tables 2-4. Plants not treated with the test composition serve as controls.

During the test, the temperature of the greenhouse was maintained at 15-25℃, the intensity of the lighting was maintained at 24 kilolux, and the luminous intensity was 70W-7FL-”
and the relative humidity content is 80%.

Results are evaluated 15 days after germination.

The condition of the plants is expressed by the following scores: 0 = undamaged, 1 to less than 25% of the plants are damaged, 2 = not more than 50% of leaf twisting (deformation) and growth inhibition, 3 = leaf twisting. (Variation) Growth inhibition is not more than 75%, 4 = 100% leaves die.

The data in Tables 2 to 4 show that the combination of acetochlor and fluorodifen ranges from 0.2+0.8Ky/ha to 0.
．． It is clearly shown that a synergistic effect is exhibited over the entire dosage range of 7+0.3 Kg/ha, ie within the active ingredient ratio limits of 1:4 to 2.3:1.

Best results are obtained with an active ingredient ratio of 1:2 to 1:1.

Example 2 Field test: width of 250TrL2, organic anastomosis ff12.44
The study was carried out on 4 plots of soil with %. Maize (Pioneer) is grown at the beginning of May in completely homogenized soil.
3978) soo, ooo seeds/Tsuktar~
Sow at a depth of 6 cm. Table 5 shows the plot on the day after sowing.
It is treated separately with an aqueous suspension spray made from 84% by weight wettable powder (WP) with the stated composition and 4% by weight granules (G). Spraying is carried out using a Haflinger atomizer and the granules are spread using a Huontan granulating device. Untreated plants are used as controls.

The test is evaluated at the beginning of October by calculating the conical holes of the Vanicum miriasum in an area of 4 x 1 m2 in each plot and visually assessing the signs of damage to the maize.

The results are summarized in Table 6.

The data in Table 6 shows that the synergistic combination active ingredients are 4.2Kg/
The plots treated with hectares of river stone were virtually free of Vanicum miliariasum during the entire cultivation period, indicating that the dangerous weed was practically completely eliminated. On the other hand, treatments carried out using this active ingredient separately were completely ineffective. It is observed that if the ingredients are applied alone in double doses (ie 100% over), they cannot effectively combat Panicum miliariasum and the maize may suffer some damage. Different formulations with varying concentrations (WP and G) were found to be equivalent from the point of view of biological activity.

This is data showing the activity of Toclol (8) 83 and fluorodifen (F) and the effect of the present invention.

Claims (5)

[Claims] (1) N-(2'-ethyl-6'-methyl-phenyl)
-N-ethoxymethyl-2-chloro-acetamide and 2-nitro-1-(4-nitrophenoxy)-4-trifluoromethyl-benzene in a 1:4-2.3:1 mixture as active ingredient A herbicidal composition characterized in that it contains a total amount of % by weight and a mixture of customary inert solid or liquid carriers and auxiliaries. (2) one or more aliphatic and/or aromatic hydrocarbons, alcohols, ketones, and/or esters, preferably xylene or cyclohexanone, and/or in a total amount of 40 to 90% by weight as liquid carrier; Weed killer according to claim 1, comprising as solid carrier a total amount of 40 to 90% by weight of one or more natural minerals, preferably silicic acid, china clay, kaolin, ground limestone and/or synthetic silicates. Composition. (3) one or more wetting agents and/or dispersants and/or nonionic and/or anionic surfactants or adhesives and/or selectivity modifiers in a total amount of 0.5 to 15% by weight as adjuvants; The herbicidal composition according to claim 1, which comprises a herbicidal composition. (4) N-(2'-ethyl-6'-
characterized in that applying an effective amount of a combination of methyl-phenyl)-N-ethoxymethyl-2-chloro-acetamide and 2-nitro-1-(4-nitrophenoxy)-4-trifluoromethyl-benzene, Weeding method. (5) N-(2'-ethyl-6'-methyl-phenyl)-N-ethoxymethyl-2-chloro-acetamide and 2-nitro-1-(4-nitro-phenoxy)-4- to kill weeds. Use of trifluoromethyl-benzene combination.