JPS6034902A - Herbicidal composition - Google Patents

Abstract

PURPOSE:A composition comprising 3,4-dichloropropion anilide and a specific pyrazole derivative as active ingredients, showing more excellent synergistic effects of herbicidal action on various kinds of weeds by foliar treatment or under flooding conditions with a small application amount than their individual use. CONSTITUTION:A composition comprising 1pt.wt. 3,4-dichloropropion anilide used as a herbicide of foliar contact type and 0.01-10pts.wt. pyrazole derivative shown by the formula (A is lower alkylene; X is halogen, nitro, or lower alkyl; n is 0-5) as active ingredients in a blended state. The mixture has effects before or after germination of weeds, exhibits high effects by soil treatment and foliar treatment, is useful for paddy rice plant, various kinds of grains, beans, cotton, vegetables, orchards, lawns, pastures, tea plantations, etc., and applicable in any form, whether flooding treatment, foliar treatment after surface drainage, foliar treatment in direct sowing culture of paddy rice on well-drained paddy field or direct sowing culture in flooded paddy field.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to 44-dichloropropionanilide and a compound having the general formula (■): (wherein, A represents a lower alkylene group, and X represents a rogen atom, a nitro group, or a lower alkyl group). where n represents O or an integer of 1 to 5. When n is 2 to 5, X may be the same or different. ) is blended with a compound selected from pyrazole derivatives represented by () to bring about a synergistic effect that is so remarkable that it cannot be expected from the single application of each.

The present invention relates to a mixed herbicide composition that has the advantage of being able to kill many types of problem weeds at low application rates.

Many herbicides for paddy fields have been proposed and put into practical use, but most of them are so-called germination inhibitors. However, in actual fields, even after treatment with a germination inhibitor, the activity of the drug decreases and various weeds continue to germinate and grow, so it is difficult to effectively control one weed with only a germination inhibitor. is extremely difficult.

The best form of control is to exterminate all paddy weeds at once after they have emerged. Several control methods have been considered as treatments for such weeds during their growing season;
Mi-4-dichloropropionanilide (hereinafter referred to as compound (A))
) is widely used worldwide and is extremely effective. The reason for this is that this example has the property of not selectively causing chemical damage to rice by treating it with green leaves, and that it completely kills all young broad-leaved weeds, including field weeds. Compound (A)
For application, complete drainage is an absolute prerequisite for the herbicidal effect to be expressed, and at least 2 to 2 hours after direct spraying on weed leaves.
You must avoid water for 3 days.

Compound A is widely used around the world by the method described above, but in order for K to exhibit sufficient effects, it is necessary to apply a large amount of the active ingredient per unit area.

Furthermore, the compound A K Vi # has no so-called germination inhibitory effect and is used as a steam-leaf contact herbicide, and when treated in water while water is still on the river surface, the active ingredient is diluted and diffused, resulting in further It has the property of being extremely disadvantageous in practical terms, requiring the injection of a large amount of active ingredient.

The present inventors have conducted various studies to compensate for the above-mentioned drawbacks, and as a result9, the mixed composition of the present invention has significantly improved the effect of vegetable leaf processing, and has also been found to be effective even in so-called irrigation conditions where water is stored on the rice field. Furthermore, they discovered that the efficacy against various weeds was significantly increased and completed the present invention. That is, (1) the mixture of the present invention, by mixing Compound A and the compound represented by the above general formula (Natsu), (2) has a synergistic effect on each of the vine plants that far exceeds the effect expected when the two are mixed. show.

When applying the compound of the present invention, it can be applied to either flooding treatment, post-waterfall violet leaf treatment, or green leaf treatment in dry field type 45 flooded direct sowing cultivation, and a practically effective effect can be expected.

Examples of compounds having the general formula (1) that are used as one of the active ingredients in the herbicide of the present invention are shown in Table 1 (compound numbers are referred to in the following description).

These compounds can be produced by the same method as in the examples described in Japanese Patent Application No. 57-69351 previously filed by the present applicant.

Formula: % Formula % The mixed herbicide composition shown in the present invention is a novel combination that has not been described in any two literatures, and of course, there is no literature that mentions its unique efficacy enhancement. The reciprocal effects associated with the present invention are observed over a wide range of mixing ratios.

A useful herbicide can be prepared by mixing 101 to 10 parts by weight of the compound represented by the general formula (summer) to 1 part by weight of compound (A).

The herbicide of the present invention thus completed is effective even when treated before and after the germination of weeds, and is highly effective when treated in soil or in combination with steamed leaves and soil. Applications include not only paddy rice but also kernels, various grains, legumes, cotton,
It is useful for vegetables, orchards, lawns, pastures, tea gardens, forest lands, non-agricultural lands, etc.

The mixture of the present invention may be sprayed as the raw material itself, or may be mixed with a carrier and other adjuvants as necessary to form a formulation commonly used as a herbicide, such as powder, coarse powder, etc.
It is prepared and used as a single fine granule, an aqueous solution, an emulsion, an aqueous solution, an aqueous solution, an oil suspension, etc.

For application of the mixtures of active ingredient compounds according to the invention as herbicides, general KU, suitable carriers 2, such as clay, Merck, bentonite.

Solid carriers such as diatomaceous earth or liquids such as water, alcohols (methanol, ethanol, etc.), aromatic hydrocarbons, ethers, ketones, esters (ethyl acetate, etc.), acid amides (dimethylformamide, etc.) It can be applied in combination with a carrier, and if desired, an emulsifier (1), a dispersant, a suspending agent, a penetrating agent, a spreading agent, a stabilizer, etc. can be added, and the formulation can be formulated into any dosage form such as an emulsion, an aqueous solution, or a powder (2) granules. It can be put to practical use.

In addition, if necessary, other types of herbicides, various insecticides, fungicides, synergists, etc. may be mixed and applied at the time of formulation or spraying.

Next, specific formulation examples of formulations using the compounds of the present invention will be shown. Parts indicate parts by weight. However, the formulation examples of the present invention are not limited to these only.

Formulation Example 1 Granules After uniformly mixing and pulverizing the above ingredients, a small amount of water is added, the mixture is stirred and kneaded, and the mixture is granulated using an extrusion granulator and dried to form granules.

Formulation Example 2 Granules After uniformly mixing and pulverizing the above ingredients, a small amount of water was added, the mixture was stirred and kneaded, and the mixture was granulated using an extrusion granulator.

Dry and make into granules.

Formulation example 3 Hydrating agent The above is uniformly mixed and pulverized to make an irrigation agent.

Formulation example 4 Hydrating agent The above is uniformly mixed and pulverized to make an irrigation agent.

Formulation example 5 Milk agent The above is mixed uniformly to form an emulsion.

Next, the effects of the herbicide composition of the present invention will be specifically explained by giving test examples.

Test Example 1 Weeding effect test under flooded conditions 175000
After putting alluvial soil into Earl's Hugnerbot, water was added and mixed to create a flooding condition at a depth of α5 m.

Japanese millet, broad-leaved weeds (Japanese cabbage, Japanese azalea, Japanese grass)
, seeds of each kind of firefly were mixedly sown in the above pots,
In addition, I placed a bed of Urikawa clump violet, Mizugaya clump violet, and Kurogwai clump violet. Furthermore, the seed type at the 25-leaf stage is transplanted, the pot is placed in a greenhouse at 20 to 25 degrees Celsius, and the plant is grown. 12 days after sowing, when the barnyard grass is at the 2-leaf stage, the prescribed amount of the chemical is reached. The diluted chemical solution was applied to the leaves and soil surface using a spray gun. After 38 days, the irrigation state was set to a water depth of 23 degrees.

Three weeks after the chemical solution treatment, the herbicidal effect on various weeds was investigated according to the following criteria.

The results are shown in Table 2.

Judgment Criterion 5...Weed killing rate 90X or more (almost complete death) 4-...
・ 1 70-9ON 3 ・-- 1 40-7ON 2 ・-- 1 20-4ON 1 ・-・ 1 5-2ON O...-#'5X or less (almost ineffective) However, the above-mentioned The grass rate was determined by measuring the weight of above-ground living grass in the chemically treated area and the above-ground living reed weight in the untreated area using the following formula.

Table 2 Test Example 2 A polyethylene pot with an inner diameter of 8G was filled with paddy soil,
Japanese millet was grown in the field, and during the two-leaf stage of the millet, a prescribed amount of each drug formulated into an irrigation agent was applied to both the leaves and the soil.

The pots were placed in a greenhouse at 25 to 30°C for controlled growth, and 5 days after the treatment, the pots were filled with water to a water level of 21M. The above-ground grass weight of the barnyard grass remaining on the 50th day after the treatment and the above-ground grass weight of the untreated area were measured, and the herbicidal rate (weed killing rate) was calculated using the following formula. The results are shown in Table 3.

Table 3 Explanation of the E value in Table 3Individual active compounds often exhibit shortcomings in their herbicidal activity, but in such cases, the herbicidal activity of the combination of two active compounds is When the activity of two compounds is greater than the simple sum of their respective activities (expected activity), this is called synergism.

The expected activity of a specific combination of two herbicides is 1.
It can be calculated as follows (0olby,
B, R, Calculation of synergism and box-reaction of herbicide combinations [WeedJ Vol, pp. 15.20-22, 196
7): X: Suppression rate when treated with herbicide A at an amount of ar/R: Suppression rate when treated with herbicide Bt-bP/Are: Suppression rate E when treated with herbicide A at an amount of af/A If the expected suppression when herbicide B is used at bf/R, that is, the actual suppression rate, is greater than the E value (expected value) calculated above, the activity of one combination is said to exhibit synergism. be able to.

Patent applicant: Nissan Chemical Industries, Ltd.

Claims (1)

[Claims] (1) with h4-dichloropropionanilide. General formula (■): (In the formula, A represents a lower alkylene group, XFi halogen atom, nitro group, or lower alkyl group, and represents ntiO or an integer of 1 to 5. When n is 2 to 5, may be the same or different from each other.) A herbicidal composition containing as an active ingredient a compound selected from pyrazole derivatives represented by