JPS63211201A - Herbicide composition - Google Patents

Abstract

PURPOSE:To obtain a herbicidal composition having expanded herbicidal spectrum at a low rate of application by synergistic effect and capable of selectively killing a wide variety of weeds especially in a field of crops such as wheat, by using a tetrahydrophthalimide derivative and fluroxypyr as active components. CONSTITUTION:The objective composition contains, as active components, (A) a tetrahydrophthalimide derivative of formula I (R is CH3 or H) having herbicidal activity, i.e. the compound of formula II or formula III and (B) fluroxypyr of formula IV [=1-methylheptyl 4-amino-3,5-dichloro-6-fluoro-2- pyridinyloxyacetate] known as a herbicide. The amount of the component B is 0.1-1,000pts.wt. per 1pt.wt. of the component A. The active components are mixed with a carrier and an adjuvant and used in the form of emulsifiable concentrate, wettable powder, suspension, powder, granule, etc. The composition is effective especially in killing refractory weeds such as cleavers, white-bird's- eye, Byzantine-speedwell, violet, forget-me-not, etc., at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula [1] C, where R represents a methyl group or a hydrogen atom. ] Contains the tetrahydrophthalimide derivative represented by and 1-methylhebutyl 4-amino-8,5-dichloro-6-fluoro-2-pyridinyloxyacetate (hereinafter referred to as fluroxivir) as active ingredients. The present invention relates to a herbicidal composition (hereinafter referred to as the composition of the present invention).

Currently, a large number of herbicides are used as herbicides for upland fields, but there are many types of weeds that can be controlled (and because they occur over a long period of time, they are more effective at killing weeds and have a wide herbicidal spectrum. , and safe herbicides are needed for crops.

As a result of various studies to develop a herbicide that meets these objectives, the present inventors have found that the composition of the present invention containing the tetrahydrophthalimide derivative (1) and fluoroxypyr as active ingredients is effective against various weeds. , can selectively weed a wide range of weeds, especially in grain fields such as wheat and barley, and moreover, the herbicidal efficacy is synergistically increased compared to when they are used alone, and they can be applied at low dosages, Furthermore, they discovered that the herbicidal spectrum was expanded, and completed the present invention.

Weeds targeted by the composition of the present invention include Yaemugura,
Examples include dicotyledonous plants such as chickweed, violet, violet, volcanic foliage, staghorn daisy, violet violet, sycamore, foxglove thistle, gourd pine, forget-me-not, hartade, snail knotweed, sopaca vulgare, convolvulus, sycamore, japonica, 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, sorrel weed, red-weed, and forget-me-not.

It is stated in European Patent No. 61741 that the tetrahydrophthalimide derivative [1] has a herbicidal effect, and fluroxypyr has a herbicidal effect.
Protection Conference-We
eds1985, Volume 8, Page 989 (Br1tish
It is a herbicide described in Crop Protection Council 1).

The mixing ratio of the tetrahydrophthalimide derivative CI), which is the active ingredient of the composition of the present invention, and fluoroxypyr can be varied over a relatively wide range, but usually, fluoroxypyr is mixed with one part of the tetrahydrophthalimide derivative [I]. 0.1-1000 serious danger, preferably 1-50
It is a 0-layer lid.

Table 1 shows the chemical structural formulas of the individual compounds of the tetrahydrophthalimide orbital conductor (1) and fluoroxypyr.

Table 1 The composition of the present invention is usually formulated into emulsions, wettable powders, suspensions, powders, 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, aphthapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, kur [powder], urea, ammonium sulfate, and synthetic hydrous silicon oxide. Examples of 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, acetate, water and the like. Surfactants used for emulsification, dispersion, wet layering, etc. include anionic surfactants such as alkyl sulfate salts, alkylaryl sulfonate salts, dialkyl sulfosuccinate salts, and polyoxyethylene alkylaryl 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 auxiliaries include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP (isopropyl acid phosphate), and the like.

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

Formulation Example 1 1 part of Compound (1), 50 parts of fluroxivir, 10 parts of synthetic hydrous silicon oxide, 8 parts of alkyl sulfate, 2 parts of calcium lignosulfonate, and ±84 parts of diatoms are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 2 parts of Compound (1), 20 parts of fluroxivir, 8 parts of polyoxyethylene sorbitan monooleate, and 76 parts of water are mixed and wet-pulverized to a particle size of 5 microns or less to obtain a suspension.

Formulation Example 8 80 parts of compound (2), 80 parts of fluroxivir, 3 parts of calcium ligninsulfonate, 2 parts of sodium lauryl sulfate
1 part and 35 parts of synthetic hydrated silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 4 Compound (2) 1 m, 9 parts of fluroxivir, 80 parts of bentonite, 1 part of calcium lignosulfonate, and 59 parts of talc were thoroughly ground and mixed, water was added and the mixture was thoroughly kneaded, and then granulated and dried to form granules. get.

These preparations are diluted with their tt or water 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 damage improvers, 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, 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 10,000 g. 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.

The herbicidal efficacy was determined by measuring the fresh weight of the above-ground parts of the test plants that remained dead at the time of the survey, and calculating the growth suppression rate (%) using the following formula.
).

Growth inhibition rate (%) = Test example 1 of fresh weight of above-ground parts of untreated test plants Field soil stem and leaf treatment spectrum test area 88 x 28
d. Field soil was filled in a vat with a depth of 113 mm, and wheat, barley, japonica, chickweed, violets, violets, forget-me-nots, wild mustards, and sycamores were sown and cultivated outdoors. The growth of each plant is from 1 to 4 leaves stage,
When the plant height reaches 2 to 25α, make the test material into a hydrating powder according to Formulation Example 1, dilute the specified amount with water, and spray it with a small spray from above the plant at a rate of 500 liters per hectare. Spread it evenly over the surface of the stem vegetables using a piston. After spraying 86
The herbicidal efficacy was investigated on the second day.

The results are shown in Table 2.

2/' Test Example 2 Field soil stem leaf treatment test A vat with an area of 88 x 2Bcd1 and a depth of 113 is filled with field soil and seeds of O. ! /IN and grown for 20 days. Thereafter, the sample was made into a suspension according to Formulation - Example 2, a predetermined amount of the suspension was diluted with water equivalent to 600 liters per hectare, and the mixture was uniformly distributed from the top of the plant to the entire stem and leaf area using a small injector. Processed. At this time, the growth status of the giant dogfish was in the 1-2 leaf stage, and the plant height was 1-2α.

Herbicidal efficacy was investigated 86 days after treatment. The results are shown in Table 8. This test was conducted outdoors during the entire period.

Table 8 Test Example 8 Field Soil Treatment Test A vat with an area of 88 x 28 m and a depth of 11 m was filled with field soil, and forget-me-not poles were sown and grown for 20 days.

Thereafter, the test material was made into a wettable powder according to Formulation Example 1, a predetermined amount of the powder was diluted with water equivalent to 500 liters per hectare, and the mixture was uniformly applied to the entire foliage area from the top of the plant using a small sprayer. At this time, the growth status of Wasurenage was 1 to 2.
Wtt11, graves 1-2t11. Processing 85
The herbicidal efficacy was investigated after 1 day. The result is the 4th F! Shown below. This test was conducted outdoors throughout the entire period.

Table 4 Table '8 and 'Fel fruits in Table 4 are calculated using the isoeffect line method [Fukami order - 1 Yasuhiko Uesugi, Kozo Ishizuka, Chojibu Tomizawa (eds.) Pesticide Experimental Methods Volume 8 Herbicides Edition 1st Edition pp. 109-111 (1981)
(Refer to published by Soft Science). The results are shown in FIGS. 1 and 2.

[Brief explanation of the drawing]

(1) Figure 1 was drawn using the iso-effect line method based on the herbicidal efficacy against the giant dogfish in Table 8 of Test Example 2. The horizontal axis is the amount of active ingredient (f/ha) of compound (1)
'), and the vertical axis represents the active ingredient 1t(f
/ha). 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 forget-me-nots in Table 4 of Test Example B. The horizontal axis is the active ingredient molecule fi (f/ha) of compound (2)
), and the vertical axis represents the amount of active ingredient of fluroxivir (1/h
:a). 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. Figure 1: Application amount of active ingredient (q, 'na) of compound (1)

Claims (1)

[Claims] General formula ▲ Numerical formula, chemical formula, table, etc. ▼ [In the formula, R represents a methyl group or a hydrogen atom. ] A herbicidal composition comprising a tetrahydrophthalimide derivative represented by the formula and 1-methylheptyl 4-amino-3,5-dichloro-6-fluoro-2-pyridinyloxyacetate as active ingredients. .