JPS63190805A - Herbicidal composition - Google Patents

Abstract

PURPOSE:To obtain a herbicidal composition, containing a tetrahydrophthalimide derivative and methabenzthiazuron, linuron or neburon as an active ingredient, capable of selectively controlling various weeds, synergistically increasing effects thereof and sufficiently usable in a small amount of chemical. CONSTITUTION:A herbicidal composition containing (A) a tetrahydrophthalimide derivative expressed by the formula (R is methyl or H) and (B) methabenzthiazuron, i.e. 3-(2-benzothiazolyl)-1,3-dimethylurea, linuron, i.e. 3-(3,4- dichlorophenyl)-1-methoxy-1-methylurea or neburon, i.e. 3-(3,4-dichlorophenyl)-1- butyl-1-methylurea, preferably at 1:1-500 weight ratio as an active ingredient. The above-mentioned composition is capable of selectively weeding a wide range of weeds in cereal farmland, particularly wheat, barley, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula α [wherein R represents a methyl group or a hydrogen atom. ] A tetrahydrophthalimide derivative represented by
2-benzothiazolyl)-1,8-dimethylurea (hereinafter referred to as metabenzothiazuron), 8-(8,4-
The active ingredient is dichlorophenyl)-1-methoxy-1-methylurea (hereinafter referred to as Rinieron) or 8-(8,4-dichlorophenyl)-1-butyl-1-methylurea (hereinafter referred to as Nebulon). The present invention relates to a herbicidal composition (hereinafter referred to as the composition of the present invention) containing the following.

Currently, a large number of herbicides are being used as herbicides for upland fields, but because there are many types of weeds to control and their emergence takes a long time, they are more effective and have a wider herbicidal spectrum. There is a need for herbicides that are safe for crops.

As a result of various studies to develop a herbicide that meets these objectives, the present inventors have developed a composition of the present invention containing a tetrahydrophthalimide derivative [alpha]] and isoproturone, metoxuron, or chlortoluron as active ingredients. can selectively weed a wide range of weeds, especially those in grain fields such as wheat and barley, and its herbicidal efficacy increases synergistically compared to when they are used alone, making it a low-drug agent. The present invention was completed based on the discovery that it can be applied in small amounts and that the herbicidal spectrum is broadly expanded.

Weeds targeted by the composition of the present invention include monocotyledonous plants such as sycamore, oat, sycamore, and foxtail; Examples include dicotyledonous plants such as , freckle vine, bindweed, sycamore, staghorn, and physalis.

The composition of the present invention can simultaneously weed weeds that are particularly difficult to weed, such as weeds such as commonweed, chickweed, commonweed, violet, violet violet, Japanese knotweed, Japanese knotweed, freckle violet, black-and-white weed, and stagweed.

Tetrahydrophthalimide derivative [υ (European Patent No. 00
61741) has herbicidal activity, and metabenzthiazuron, linuron and nevieron (C,R,W
orthing et al., Th@PesticidesMan
ual 7th edition 856.886 and 898 pages (198
8th year) Th@Br1t1sh Crop Proto
tion Council 1 publication] is known as a herbicide.

The mixing ratio of metabenzthiazuron, linieron or nevieron to the tetrahydrophthalimide derivative which is the active ingredient of the composition of the present invention and metabenzthiazuron, linieron or nevieron is 0.1 to 1000.
Parts by weight, preferably 1 to 600 parts by weight.

Table 1 shows the chemical structural formulas of the individual compounds of the tetrahydrophthalimide derivatives [η, metabenzthiazuron, linieron, and nevieron].

The composition of the present invention usually includes a solid carrier, a liquid carrier, a surfactant,
It is mixed with other formulation auxiliaries and formulated into emulsions, wettable powders, suspensions, granules, etc.

Examples of the carrier include fine powders or granules such as kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut powder, raw paper, ammonium sulfate, and synthetic hydrous silicon oxide. Liquid carriers include aromatic/hydrocarbons such as xylene and methylnaphthalene, alcohols such as Impropatol, ethylene glycol, and cellosolve, ketones such as acetone, cyclohexanone, and isophorone, vegetable oils such as soybean oil and cottonseed oil, and dimethyl. Examples include sulfoxide, acetonitrile, water, etc. Surfactants used for emulsification, dispersion, wetlands, etc. include anionic surfactants such as alkyl sulfate salts, alkylaryl sulfonate salts, dialkyl sulfosuccinate salts, and polyoxyethylene furkylaryl ether phosphate salts. agent,
Examples include nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene polyoxybrobylene block copolymer, sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester. Examples of formulation aids include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), p*P (fi-isopropyl phosphate), and the like.

Examples of formulations are shown below. Note that parts indicate parts by weight.

Formulation Example 1 0.5 parts of compound (2), 0250 parts of metabenmethiaz, 10 parts of synthetic hydrous silicon oxide, 8 parts of alkyl sulfate, 2 parts of calcium lignin sulfonate, and 84 parts of diatomaceous earth
．． 5 parts were thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 0.1 part of compound (1), 20 parts of nevinylon, 8 parts of polyoxyethylene sorbitan monooleate, and 76.9 parts of water are mixed and wet-pulverized until the particle size is 5 microns or less to obtain a suspension. .

Formulation Example 8 Compound! (1,120 parts of linuron, 60 parts of lignin sulfonate, 8 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate, and 16 parts of synthetic hydrous silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 4 6 parts of compound (1), 0250 parts of metabenmethiaz, 6 parts of polyoxyethylene sorbitan monooleate, 6 #l of polyvinyl alcohol, and 86 parts of water were mixed and wet-pulverized until the particle size became 5 microns or less. Get some sinus medication.

Formulation Example 5 Compound (2) 1, 9 parts of Nevieron, 1 part of bentonite go, 1 part of calcium lignosulfonate, and 59 parts of talc were thoroughly ground and mixed, water was added, and the mixture was thoroughly kneaded, followed by granulation and drying to form granules. obtain.

? Part 11 6 Combination? '! (t) 0.5 parts, linuron 2 parts, cyclohexanone 80 parts, toxanone P-8L 17.
Mix 5 parts well to obtain an emulsion.

These preparations can be used as they are or diluted with water, etc., and treated with foliage or soil. In addition to treating plants from above, foliar treatments include local treatments that treat only weeds so that they do not attach to crops.

Furthermore, by mixing it with other herbicides, it can be expected to increase the herbicidal efficacy. Furthermore, it can be used in combination with insecticides, acaricides, nematicides, fungicides, plant growth regulators, fertilizers, soil conditioners, and the like.

The composition of the present invention can be used as a herbicide for fields, fallow fields, orchards, pastures, lawns, forests, non-agricultural lands, and the like.

The application amount of the composition of the present invention varies depending on weather conditions, soil conditions, composition formulation, form, type of active ingredient, mixing ratio of active ingredients, target weeds and crops, etc., but usually the amount of active ingredient per hectare is The total amount is 10 to 10000F. Emulsions, wettable powders, suspensions, etc. are usually applied by diluting a predetermined amount with 100 to 1000 liters of water per hectare, and granules, etc. are usually applied as is without any dilution.

Next, test examples will be given to specifically demonstrate the herbicidal effect of the composition of the present invention.

In addition, the herbicidal efficacy was determined by the growth suppression rate (@
Indicated by

Growth inhibition rate (b) Snow test example 1 Upland soil treatment spectrum test area 33 x
Pack field soil into a 22-inch, 113-depth vat, and add wheat, barley, cornucopia, japonica, sycamore, harutade, oat, sycamore, and sycamore, and prepare the sample according to Formulation Example 1. was made into a wettable powder, diluted with water, and uniformly sprayed on the soil surface from above the vat using a small sprayer at a rate of 500 liters per hectare.The herbicidal effect was confirmed on the 86th day after spraying. The results are shown in Table 2.This test iron was conducted outdoors throughout the entire period.

Test example 2 Upland soil treatment spectrum test area 88
22 aL, filled with bat-ζ upland soil to a depth of 11 cfII, and cultivated with wheat, barley, cornflower, grasshopper,
Sow violets, chickweed, wild mustard, watermelon, and hartade, and use the test material as a wettable powder according to Formulation Example 8. Dilute the specified amount with water to give a concentration of 50% per hectare.
The soil was uniformly sprayed from above the vat using a small sprayer at a rate of 0 liters. The herbicidal efficacy was investigated 35 days after spraying. The results are shown in Table 8. This test was conducted outdoors throughout the entire period.

Test example 8 Upland field treatment spectrum test area fJ 3
A vat measuring 22 cm x 22 cm and 11 cm deep was filled with field soil, and wheat, barley, sagebrush, japonica, chickweed, japonica, violet, violet, huskweed, and sycamore were sown, and the test material was prepared according to Formulation Example 2. was made into a suspension agent, diluted with water in a predetermined amount, and uniformly sprayed on the soil surface with a small sprayer from above the vat at a rate of 500 liters per hectare.After spraying, 8
The herbicidal efficacy was investigated on the 6th day.

The results are shown in Table 4. This test was conducted outdoors throughout the entire period.

Test Example 4 Upland soil treatment test surface [8; 9 A vat measuring 28 m and 1151 m in depth was filled with upland soil, seeds of Oroshagi were sown, and the test material was made into a suspension according to Formulation Example 4. The amount was diluted with the equivalent of 500 liters of water per hectare and applied uniformly to the soil surface using a small sprayer. Herbicidal efficacy was investigated 86 days after treatment. The results are shown in Table 5. This test was conducted outdoors throughout the entire period.

Test Example 6 Upland Soil Treatment Test A vat with an area of 88 x 28 cfA and a depth of 11,511 mm was filled with upland soil, sowed with seeds of Prunus japonicus, and the sample was made into a hydrating agent according to Formulation Example 1, and a predetermined amount of it was It was diluted with the equivalent of 500 liters of water per hectare and applied uniformly to the soil surface using a small sprayer. Herbicidal efficacy was investigated 85 days after treatment. The results are shown in Table 6. This test was conducted outdoors throughout the entire period.

Test Example 6 Upland Soil Treatment Test A vat with an area of 88 x 28 d and a depth of 113 d was filled with upland soil, sowed with seeds of Phyllanthus sinensis, and the test material was made into a hydrating powder according to Formulation Example 8, and a predetermined amount of it was spread over 1 hectare. Dilute with 500 liters of water and use a small sprayer.
The soil surface was treated uniformly. Herbicidal efficacy was investigated 86 days after treatment. The results are shown in Table 7. This test was conducted outdoors throughout the entire period.

Test Example 7 Upland Soil Treatment Test Upland soil was packed into a vat with an area of 88 x 2 BCIA and a depth of 113, and chickweed seeds were sown.The test material was made into a suspension according to Formulation Example 2, and the predetermined amount was spread over 1 hectare. per 5
The solution was diluted with 0.00 liters of water and uniformly applied to the soil surface using a small sprayer. Herbicidal efficacy was investigated 85 days after treatment. The results are shown in Table 8. This test was conducted outdoors throughout the entire period.

Table 8 The results of Tables 5 to 8 were calculated using the isoeffect line method [Fukami order - 1 Yasuhiko Uesugi,
The diagram was drawn by Kozo Ishizuka and Chojibe Tomizawa Mj4 Pesticide Experimental Methods Volume 3 Herbicide Edition 1st Edition '5109-111 (1981, published by Soft Science Co.)].

The results are shown in Figures 1 and 4.

[Brief explanation of the drawing]

(1) Figure 1 was drawn using the iso-effect line method based on the herbicidal efficacy against Oroshagi in Table 5 of Test Example 4. The horizontal axis is the active ingredient 1 of compound (1)! (flb
a ), and the vertical axis represents the amount of active ingredient of metabenzthiazuron (f4 turtle). The additive effect at a growth inhibition rate of 90% is shown by a broken line, and the isoeffect line at an actual growth inhibition rate of 90g6 is shown by a solid line. (2) Figure 2 was drawn using the iso-effect line method based on the herbicidal efficacy against Prunus annuus in Table 6 of Test Example 5. The horizontal axis is the active ingredient 9 (f
/ha), and the vertical axis represents the active ingredient jt (P/M) of metabenzthiazurone. The additive effect with a growth inhibition rate of 901 is shown by a broken line, and the isoeffect line with an actual growth inhibition rate of 90% is shown by a solid line. (8) FIG. 8 is a diagram drawn by the iso-effect line method based on the herbicidal efficacy against Phyllanthus sinensis in Table 7 of Test Example 6. The horizontal axis is the amount of active ingredient (P/h) of compound (1)
a), and the vertical axis is the active ingredient M (f/h
represents a). The additive effect of a growth inhibition rate of 909s is shown by a broken line, and the isoeffect line of an actual growth inhibition rate of 9096 is shown by a solid line. (4) Figure 4 shows the herbicidal efficacy against chickweed in Table 8 of Test Example 7, plotted using the equal effect line method. The horizontal axis is the active ingredient 1k (f/ha) of compound (2)
, and the vertical axis is the amount of active ingredient in Nebulon (flb m
) represents. The additive effect at a growth inhibition rate of 90% is shown by a broken line, and the isoeffect line at an actual growth inhibition rate of 90% is shown by a solid line. () l a () x
o. The amount of active ingredient (g/ha) of compound (2)
OHa 26 jO compound (
1) Active ingredient amount (g/ha) Figure 3 Figure 4

Claims (1)

[Claims] A tetrahydrophthalimide derivative represented by the general formula ▲ Numerical formula, chemical formula, table, etc. ▼ (In the formula, R represents a methyl group or a hydrogen atom.)
2-Benzothiazolyl)-1,3-dimethylurea-3
-(3,4-dichlorophenyl)-1-methoxy-1-
Methylurea or 3-(3,4-dichlorophenyl)
A herbicidal composition comprising -1-butyl-1-methylurea as an active ingredient.