JPH0232005A - Herbicide composition - Google Patents

Abstract

PURPOSE:To obtain a herbicide compound having high herbicidal effects, wide weed destroying spectrum and safety to crops by using a specific compound having herbicidal effects and chlorosulforon or metsulfuron-methyl well-known as a herbicide. CONSTITUTION:(A) a compound shown by formula I is blended with (B) chlorosulforon shown by formula II or metsulfuron-methyl shown by formula II as active ingredients in the ratio of 0.01-50 pts.wt., preferably 0.02-20 pts.wt. component B based on 1 pt.wt. component A to give a herbicide composition which synergistically increases herbicidal effects of each component, enlarges weed destroying spectrum and can selectively destroy various weeds, especially weeds in a wide range in grain fields of wheat, barley, etc., with a smaller amount of component compared with a separative use of each compound without phytotoxicity to crops.

Description

[Detailed description of the invention] <Industrial C usage field> The present invention relates to a novel herbicidal composition.

<Prior art and problems to be solved by the invention> Many herbicides are currently in use, but there are many types of weeds to be controlled, and their emergence takes a long time, so they are more effective at killing weeds. There is a need for herbicides that have a wide herbicidal spectrum and are safe for crops.

As a result of various studies in order to develop a herbicide that meets these objectives, the present inventors found that 2-[7-fluoro-3,4-dihydro-8-oxo −
4-(2-propynyl)-2H-1,4-benzoxazin-6-yl)-4,5,6,7-tetrahydro-
1H-isoindole-1,3(2)1)-dione (hereinafter referred to as compound (S)) and 1-(2-chlorophenylsulfonyl)-8-(4-methoxy-6-methyl-
1,3,5-triazin-2-yl)urea (hereinafter referred to as chlorsulfuron) or 2-[3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)
Aminocarbonylaminosulfonyl]methyl benzoate (
Hereinafter, it will be referred to as metsulfuron-methyl. ) as an active ingredient (hereinafter referred to as the composition of the present invention) can be used to combat various weeds, especially grain fields such as wheat and barley.
They can selectively kill a wide range of weeds, and their herbicidal efficacy is synergistically increased compared to when they are used alone, and they can be applied at lower and lower doses, further expanding the herbicidal spectrum. The present invention has been completed.

Weeds targeted by the composition of the present invention include monocotyledonous plants such as silky bentgrass and foxtail grass;
Examples include dicotyledonous plants such as chickweed, dogweed, flowering plant, violet, dog's violet, violet, Japanese violet, white holly, foxglove thistle, gourd pine, forget-me-not, harutade, snail knotweed, freckles, bindweed, whiteweed, staghorn, and physalis.

The composition of the present invention is capable of simultaneously weeding weeds that are particularly difficult to weed, such as weeds that are difficult to weed, such as commonweed, chickweed, stagweed, violet, violet, huskweed, freckleweed, staghorn daisy, japonica japonica, and dogberry.

Compound (I) (see JP-A No. 61-76486) has a herbicidal effect, and has a herbicidal effect on chlorsulfuron and metsulfur 0:/-methyl (Farm Chemicals Ha
ndbook '86, pages C58 and C15
7 pages (1986) Meister Publicis
hing Co, publication] is known as a herbicide.

The mixing ratio of compound (1), which is an active ingredient of the composition of the present invention, and chlorsulfuron or metsulfuron-methyl can be varied over a relatively wide range, but usually, chlorsulfuron to lffifi moiety of compound (1) is mixed. Sulfuron or metsulfuron-methyl ha 0.01-50ffij1
parts, preferably 0.02 to 2 parts.

The chemical structural formulas of Compound (I), chlorsulfuron and metsulfuron-methyl are shown in Table 1.

Table 1 The composition of the present invention is usually formulated into wettable powders, suspensions, granules, etc. by mixing with solid carriers, liquid carriers, surfactants, and other formulation auxiliaries.

Examples of solid carriers include fine powders or granules such as kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut shell powder, urea, ammonium sulfate, and synthetic hydrous silicon oxide. Examples of the liquid carrier include water. Surfactants used for dispersion, wet layer, etc. include anionic surfactants such as alkyl sulfate salts, alkylaryl sulfonate salts, dialkyl sulfosuccinate salts, polyoxyethylene alkylaryl ether phosphate salts, etc. polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene polyoxypropylene block copolymer,
Examples include nonionic surfactants such as sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester.

Formulation auxiliaries include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, and CMC.
(carboxymethylcellulose) PAP (isopropyl acid phosphate), etc.

These formulations contain from 1 to 90%, preferably from 2 to 80%, by weight of total active ingredients.

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.

In addition, the composition of the present invention can be used in rice fields, upland fields, fallow fields, orchards,
It can be used as a herbicide in pastures, lawns, forests, non-agricultural lands, etc.

The application amount of the composition of the present invention varies depending on weather conditions, soil conditions, formulation form of the composition, type of active ingredient, mixing ratio of active ingredients, target weeds and crops, etc., but usually the total amount of active ingredients per hectare. - is 1 to 800, preferably 5
~100 no. Wettable powders, suspending agents, etc. are usually applied after diluting a predetermined amount with 100 to 1000 liters of water per hectare, and granules, etc. are usually applied as is without any dilution.

<Example> Next, the present invention will be explained in more detail by giving formulation examples and test examples.

First, a formulation example will be shown. Note that part ii (indicates part M).

Formulation Example 1 A suspension is obtained by mixing 1310 parts of the compound, 10 parts of chlorsulfuron, 8 parts of polyoxyethylene sorbitan monooleate, and 77 parts of water, and wet-pulverizing the mixture until the particle size becomes 5 microns or less.

Formulation Example 2 Compound (I) 55 parts, metsulfuron-methyl 25 parts,
8 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate, and 15 parts of synthetic hydrated silicon oxide purple are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 8 2 parts of compound (■), 40 parts of chlorsulfuron, 10 parts of synthetic hydrous silicon oxide, 8 parts of alkyl sulfate, 2 parts of calcium lignosulfonate, and ±48 parts of diatoms were thoroughly ground and mixed to form a wettable powder. obtain.

Formulation Example 4 Mix 1315 parts of the compound, 5 parts of metsulfuron-methyl, 5 parts of polyoxyethylene sorbitan monooleate, 5 parts of polyvinyl alcohol, and 70 parts of water, and wet-pulverize the mixture until the particle size becomes 6 microns or less to obtain a suspension. get.

Formulation Example 6 2 m of compound (x), 0.04 parts of metsulfuron-methyl, 80 parts of bentonite, 1 part of calcium ligninsulfonate, and 66.96 parts of talc were thoroughly ground and mixed, water was added, and the mixture was thoroughly kneaded, followed by granulation. Dry to obtain granules.

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

The herbicidal efficacy is expressed as the growth inhibition rate calculated by the following formula by measuring the fresh weight of the above-ground parts of the test plants that remained dead at the time of the survey.

Growth inhibition rate~- Test Example 1 Field soil stem leaf treatment test A vat with an area of 88 x 22 am'' and a depth of 111 was filled with field soil and sown with wheat, barley, yellow violet, Japanese violet, violet, chickweed, dogberry, Japanese violet, and hartade. The plants were grown outdoors. When the growth of each plant reached the 1-4 leaf stage and the plant height was 2-25 cm, the test material was made into a suspension according to Formulation Example 4, and a predetermined amount of the suspension was diluted with water. The mixture was sprayed uniformly over the entire foliage area from above the plant using a small sprayer at a rate of 600 liters per hectare.

85 days after spraying, phytotoxicity and herbicidal efficacy were investigated.

The results are shown in Table 2.

Fill a vat with an area of 88 x 22 aw" and a depth of 11 Cl+ with field soil, sow wheat, barley, yellow violet, violet, violet, chickweed, dog foliage, wild mustard, and hartade, and use the sample as a wettable powder according to Formulation Example 8. The prescribed amount was 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 phytotoxicity and herbicidal efficacy were investigated 85 days after spraying.Results are shown in Table 8.

This test was conducted outdoors throughout the entire period.

Test Example 8 Upland soil treatment test A vat with an area of 88 x 28 CIl' and a depth of 11Cl+ was filled with upland soil, and violet trellises were sown. Formulation Example 2
Make the sample into a hydrating powder according to
The herbicidal efficacy was investigated after 1 day. The results are shown in Table 4.

This test was conducted outdoors throughout the entire period.

Table 4 The results in Table 4 are summarized using the isoeffect line method [Fukami order - 1 Yasuhiko Uesugi, Zenzo Ishizuka, Chojibe Tomizawa m Pesticide Experimental Methods Volume 8 Herbicide Edition 1st Edition pp. 109-111 (1981) ) Published by Soft Science Co., Ltd.].

The results are shown in FIG.

Test Example 4 Field soil, stem, and leaf treatment test A vat with an area of 88 x 28 cd and a depth of 11Cl+ was filled with field soil, and seeds of dogfish were sown and grown for 80 days. Thereafter, the test material was made into a suspension according to 11ζ on the formulation side, a predetermined amount of the suspension was diluted with water equivalent to 500 liters per hectare, and the suspension was uniformly applied from the top of the plant to the entire foliage area using a small sprayer.

At this time, the dog chamomile was in the 1-2 leaf stage and the plant height was 2-4. Herbicidal efficacy was investigated 85 days after treatment. The arrangement is shown in Table 5. This test was conducted outdoors throughout the entire period.

Similar to Test Example 8, the results in Table 6 were plotted using the isoeffect line method. The results are shown in FIG.

<Effects of the Invention> The composition of the present invention has a wide herbicidal spectrum, its herbicidal efficacy increases synergistically compared to when each compound is used alone, and it is an excellent herbicide composition that is safe for crops. It is a thing.

[BRIEF DESCRIPTION OF THE DRAWINGS] (1) Figure 1 was drawn by the iso-effect line method based on the herbicidal efficacy against violets in Table 4 of Test Example 8. The horizontal axis represents the amount of active ingredient (p/ha) of the compound,
The vertical axis represents the active ingredient of chlorsulfuron (9yha). 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. (2) Figure 2 was drawn using the isoeffect line method based on the herbicidal efficacy against dog mites in Table 5 of Test Example 4. The horizontal axis is the active ingredient of compound (1)
The vertical axis represents the main component of metsulfuron-methyl, It(II!/ha). Raw Vif acceptance rate 90%
The dotted line shows the additive effect of , and the solid line shows the iso-effect line with the actual agro-inhibition rate of 90%. Compound (1) Figure 1 Herbicidal effect on violet (9096 inhibition) (jl/ha
) Compound〔! ] Figure 2

Claims (1)

[Claims] 2-[7-fluoro-3,4-dihydro-3-oxo-
4-(2-propynyl)-2H-1,4-benzoxazin-6-yl]-4,5,6,7-tetrahydro-1
H-isoindole-1,3(2H)-dione and 1-(
2-chlorophenylsulfonyl)-3-(4-methoxy-6-methyl-1,3,6-triazin-2-yl)urea or 2-[3-(4-methoxy-6-methyl-1,
1. A herbicidal composition comprising methyl 3,5-triazin-2-yl)aminocarbonylaminosulfonyl]benzoate as an active ingredient.