JPS60197605A - Herbicidal composition - Google Patents

Abstract

PURPOSE:A herbicidal composition that contains a combination of a novel pyrazole derivative with a specific herbicide for rice paddies, thus increasing its herbicidal activity synergically to enable the complete control of all kinds of weeds only one application with high safety to rice plant, animals and men. CONSTITUTION:The objective herbicidal composition is obtained by adding 0.1- 20pts.wt. of a novel pyrazole derivative of formula I (A is lower alkylene; X is halogen, NO2, lower alkyl; n is integer of 0-5) to 1pt.wt. of N-(alpha,alpha'-dimethylbenzyl)-alpha-bromo-t-butylacetamide of formula II, which has been known as a herbicide for rice paddies. The resultant composition developes synergic effect which could not expect, if the components are used alone, to kill not only annual weeds but also prenneal weeds with a low dose, further it shows very low toxicity to rice plant, animals and humans.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula [! ]: tis (in the formula + Atj lower Alkilev fund, x represents a halogen atom, a nitro group or a lower alkyl group).

n jj O or an integer from 1 to 5. When n is 2 to 5, Xri and φ may be the same or different. )
A compound selected from the pyrazole derivatives represented by
α-promoter Shary Butylacetamide (5 below)
It is abbreviated as -47. ) as an active ingredient.

That is, by blending the pyrazole derivative represented by the general formula CI] with 9-47, a synergistic effect that could not be expected from the single application of each was produced, and a large amount of The present invention relates to a mixed herbicide composition that is capable of killing various types of problem weeds.

At present, a large number of herbicides have been put to practical use as herbicides for paddy fields, and are widely used as single agents and mixtures. However, there are many types of paddy weeds, and although there are many herbicides that are effective against young weeds, there are few herbicides that are sufficiently effective against a wide range of perennial weeds. As a result, various types of perennial weeds are increasing, and their control is in great demand.

Perennial weeds generally grow vigorously, have a long emergence period, and are a type of harmful grass. Therefore, herbicides are desired to have a broad spectrum of herbicidal properties that can kill many types of weeds.

In addition, in recent years, mechanization and earlier transplantation of rice cultivation have rapidly become widespread, providing a more suitable place for weeds to grow than ever before, and complete weed control can be expected with -1 herbicide application. tend to be unable to do so. For this reason, it is not just a fool's errand that requires the same or different efforts, but also poses undesirable problems such as chemical damage to paddy rice and residue in the soil due to large amounts of application.

In order to improve these problems of conventional herbicides, the present inventors have developed a herbicide that can completely control all weeds by multiple spraying, has a high degree of safety for paddy rice, and is extremely toxic to humans and animals. As a result of continuing the search for a safe herbicide with a low herbicide, it was discovered that an excellent herbicide that solved these problems could be obtained by combining two types of active ingredients, and the present invention was completed.

That is, 1 the present invention uses 8-4, which is known as a herbicide for paddy fields.
7 and a compound selected from the novel pyrazole derivatives represented by the general formula [■].

To explain the present invention in more detail, Compound 5-47, which is one of the components of the herbicide, is generally used.

Some are slightly less effective against Japanese barnyard grass and Japanese grasshoppers, and relatively high against firefly and Japanese snail, but their effectiveness cannot be said to be sufficient for practical use.

On the other hand, the compound represented by the general formula [1] is barnyard grass.

It shows high activity against firefly, pineweed, annual six-leaf weeds, urikawa, water cypress, black cypress, etc.
It has particularly high activity against weeds of the Cyperaceae family, such as firefly, pineweed, Japanese cypress, and black cyperus.
It also shows strong activity against barnyard grass at the early stage of growth.

The present inventors discovered a compound represented by the general formula C and a compound 5
-47 was found to have a high synergistic effect on weeds other than barnyard grass, such as firefly grass, in addition to having an additive effect on barnyard grass in the pre-emergence and growing stages. It was also found that it has a high synergistic herbicidal effect on plants such as Prunus japonicus.

Examples of compounds having the general formula t- 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 were manufactured by the same method as the example described in the specification of Japanese Patent Application No. 1983-69351 previously filed by the applicant. can.

The mixture shown in the present invention is a novel combination that has not been described in any literature, and of course, there is no literature that mentions its unique potency enhancement. The mutual effect related to the present invention was observed in a wide range of mixing ratios, and compound Hi-47 was added to 1 part by weight of the general formula [Summer].
A useful herbicide can be prepared by mixing the compounds represented by α1 to 20 parts by weight. The herbicide of the present invention thus completed is effective even when treated before and after weed germination, and is highly effective when treated in soil or in combination with soil treatment.

Applications include not only paddy rice but also various grains,
Legumes, cotton, one vegetable, orchard, lawn.

It is useful in pastureland, tea gardens, forest land, non-agricultural land, etc.

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 was added, the mixture was stirred and kneaded, and the mixture was granulated using an extrusion granulator.

Dry and make into granules.

Formulation Example 2 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 3 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 4 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.

j Togane "1" - Granules After uniformly mixing and pulverizing the above ingredients, add a small amount of water, stirring and kneading, granulate with an extrusion granulator and dry to make granules.

Formulation Example 6 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 7 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 8 Granules After uniformly mixing and pulverizing the above ingredients, a small amount of water is added, stirring and kneading are carried out, and the mixture is granulated using an extrusion granulator and dried to form granules.

Formulation Example 9 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 1O grain Formulation example Wettable powder (White Carbon; Shionogi & Co., Ltd. product name) The above ingredients are uniformly mixed and pulverized to form a wettable powder.

Test Example 1 Weeding effect test under flooded conditions 115000
After putting alluvial soil into Earl's Hugnerbot, water was added and mixed to create a flood condition with a water depth of 2.

One seed of each of Japanese millet and firefly was sown in the above pot, and a bed of violet violet was also placed. 20 pots
Place in a greenhouse at ~25°C.

The plants were grown, and on the 7th day after sowing, the barnyard grass was at the T5 leaf stage.

When the firefly was in the two-leaf stage and the urikawa was in the one-leaf stage, a diluted drug solution was dropped using a volumetric pipette so that the amount of the drug was a predetermined amount.

Three weeks after dropping the chemical solution, the herbicidal effect on various weeds was measured by measuring the above-ground grass weight in the chemical-treated area and the above-ground grass weight in the untreated area, and the herbicidal rate (X) was calculated using the formula F.

The results are shown in Table 2.

Table 2 Test Example 2 A polyethylene pot with an inner diameter of 8 cIR was filled with paddy soil, and Japanese millet was grown in the paddy field, and at the 2.5 leaf stage, the soil was treated with a predetermined amount of each drug formulated into an irrigation agent.

The pots were placed in a greenhouse at a temperature of 25 to 50 degrees Celsius for controlled cultivation, and the weight of the above-ground grass of the Japanese millet remaining in the untreated area was measured 50 days after the treatment, and the weight of the above-ground grass of the untreated area was calculated using the following formula. The weed killing rate (X) was calculated. The results are shown in Table 3.

Table 3 The E values in Table 2.3 In many cases, individual active compounds exhibit drawbacks in their herbicidal activity, but in such cases, the herbicidal activity when two active compounds are combined is , is said to be synergistic when the activity of the two compounds is greater than the simple sum of their respective activities (expected activity).

The expected activity of a specific combination of two herbicides is 1.
It can be calculated as follows. (Colby,
S, R, Calculation of synergistic and antagonistic reactions of herbicide combinations 1'-weedJ vol, 15.20-22,
(see 1967): If the expected inhibitory group, that is, the actual inhibition rate when using af/R, herbicide 5 in br/R, is greater than the E value calculated above, then the activity of the 9 combination is said to exhibit synergism. be able to.

Patent Applicant Nissan Chemical Industries, Ltd. Procedural Amendment (Method) 2 Name of the Invention Herbicide Composition 3 Relationship to the case of the person making the amendment Patent Applicant Address (3-7 Kanda Nishiki-cho, Chiyoda-ku, Tokyo 101) 14.Date of amendment order

Claims (1)

[Claims] (In the formula, A is a lower alkylene group, X is a halogen atom,
represents a nitro group or a lower alkyl group, n is O or 1
Indicates an integer between ~5. When n is 2 to 5, Xl'i may be the same or different from each other. ) and N-(d,α'-dimethylbenzyl)-α-promoter ary-butylacetamide represented by the compound F as active ingredients. Composition.