JPS6253903A - Herbicide composition - Google Patents

Abstract

PURPOSE:To provide a herbicidal composition having synergetically improved herbicidal effect and effective at a low rate of application, by using tetrahydro-1 H-1,2,4-triazolo-(1,2-a)-pyridazine-1,3-2H-dione derivative and paraquat as active components. CONSTITUTION:The objective herbicidal composition contains (A) 1pt.(wt.) of 2-(4-chloro-2-fluoro-5-propargyloxyphenyl)-5, 6, 7, 8-tetrahydro-1H-1, 2, 4- triazolo-(1, 2-a)-pyridazine-1, 3-2H-dione of formula I and (B) 0.1-50pts., prefer ably 0.2-40pts. of 1,1-dimethyl-4,4'-bipyridinium ion of formula II or its salt (namely, paraquat). EFFECT:The herbicidal spectrum can be expanded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 2-(4-chloro-2-fluoro-5-probargyloxyphenyl)-5,6°7.8-tetrahydro-LH-1,2,4-triazolo -(1,2-a)
-pyridazine-1゜3-2H-dione (hereinafter, compound [
It is written as 11. ) and 1,1'-dimethyl-4,4'-bipyridinium ion or its salt (hereinafter referred to as paraquat) as active ingredients (hereinafter referred to as the composition of the present invention). It is something.

Currently, a large number of herbicides are used for agricultural and non-agricultural land, but because there are many types of weeds to control and their emergence takes a long time, the herbicides are more effective and have a wider herbicidal spectrum. The development of herbicides is desired.

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 compound [I] and paraquat as active ingredients can be used on agricultural land or non-agricultural land. It controls a wide range of weeds that occur, and its herbicidal effect is higher than when used alone.
The present invention has been completed based on the discovery that the herbicidal spectrum is expanded synergistically, can be applied at low dosages, and has an expanded herbicidal spectrum.

Weeds that can be controlled by the composition of the present invention include buckwheat, Japanese knotweed, purslane, chickweed, whiteweed, Japanese radish, Japanese radish, Japanese radish, shepherd's shepherd, American hornwort, staghorn weed, Japanese commonweed, American golden deer, field pansy, Japanese violet, American morning glory, Broad-leaved weeds such as morning glory, St. convolvulus, Hemlockweed, Hotokenoza, White-breasted morning glory, Japanese oatweed, Japanese oatweed, Oatweed, sunflower, Japanese chamomile, corn marigold, millet, Japanese millet, foxtail grass, black-leaf grass, sycamore, sycamore, oat, oat, Weeds of the Poaceae family, such as Seiban sorghum, Siba wheat, Umanochahiki, and Gitsougishipa;
; Examples include weeds of the Cyperaceae family, such as Gomega spp.

Compound〔! ] (U.S. Pat. No. 4,452,981) has herbicidal activity, and paraconite [W, T.

Thomson (ed.), Agricultural Che.
micals Book uHerbicides 1st
11 (1983) etc.] is known as a herbicide.

The compound that is the active ingredient of the composition of the present invention [! ] and paraquat can be varied within a relatively wide range, but usually the amount of paraquat is 0.1 to 50 parts by weight, preferably 0.2 to 40 parts by weight, per 111 parts by weight of the compound [111 parts by weight] Department.

The chemical structural formulas of compound [I] and paraquat are shown in Table 1.

Table 1 1. Examples of salts of 1'-dimethyl-4,4'-bipyridinium ion include dichloride, dimethyl sulfate, and the like.

When the composition of the present invention is used as a herbicide, it is usually mixed with a solid carrier, a liquid carrier, a surfactant, and other formulation auxiliaries, and formulated into an emulsion, wettable powder, suspension, or the like.

These preparations contain the active ingredient at a ratio of 1 to 9 (1, preferably 2 to 80%).

Examples of solid carriers include fine powders or granules such as kaolin clay, attapuldi odoriferous clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut powder, urea, ammonium sulfate, and synthetic hydrous silicon oxide; Examples of carriers include aromatic hydrocarbons such as xylene and methylnaphthalene, alcohols such as Impropatol, ethylene glycol, and cellosolve, ketones such as acetone, cyclohexanone, and inholone, vegetable oils such as soybean oil and cottonseed oil, and dimethylsulphate. Examples include oxide, acetonitrile, water, etc.

Surfactants used for emulsification, dispersion, wet carbonization, etc. include anionic surfactants such as alkyl sulfate salts, alkylaryl sulfonate salts, dialkyl sulfosuccinic acid salts, and polyoxyethylene alkylaryl ether phosphate salts. , polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene polyoxypropylene block copolymer, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and other nonionic surfactants. As formulation aids, lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), P
Examples include AP (isopropyl acid phosphate).

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

Formulation Example 1 (244 Hi ↑ Small) ≠ 1,125 parts of kanhiro compound, 11 parts of Paraco 1:1, 3 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate, and 45 parts of synthetic hydrated silicon oxide were thoroughly ground and mixed. to obtain a hydrating agent.

1 part of polyoxyethylene sorbitan monooleate, 3 parts of CMC, and 69 parts of water were mixed and wet-pulverized until the particle size became 5 microns or less to obtain a suspension 1laI agent.

The composition of the present invention prepared in this manner is applied to the foliage of weeds after they emerge. 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 treating the soil with the composition of the present invention, it is possible to control the growth of weeds after treatment, and furthermore, it does not cause problematic phytotoxicity to crops such as soybeans, cotton, corn, and wheat. Furthermore, by mixing it with other herbicides, it can be expected to increase the herbicidal efficacy. Furthermore, it can also be used as a kernel that is mixed with insecticides, acaricides, nematicides, fungicides, plant growth 811 moderators, and the like.

The composition of the present invention can be used as a herbicide for fields, fallow fields, orchards, pastures, lawns, forested areas, non-agricultural lands, and the like. Particularly in upland fields, no-tillage cultivation is used in addition to the usual processing methods.
ng) can also be used.

The application g of the composition of the present invention depends on the mixing ratio of the active ingredients, the formulation form,
Although it varies depending on the type of target weed, weather conditions, etc., the total amount of active ingredients per are is usually 1y to 50g, preferably 32 to 25f, and emulsions, wettable powders, suspensions, etc. The specified amount is 1 liter to 10 per are.
Dilute with a liter of water (added with adjuvants such as spreading agents if necessary) and process.

In addition to the above-mentioned surfactants, the spreading agents include polyoxyethylene resin acid (ester), lignin sulfonate,
Examples include abietate, dinaphthylmethane disulfonate, and paraffin. Next, test examples will be given to specifically demonstrate the herbicidal effect of the composition of the present invention.

The herbicidal efficacy is determined by the growth suppression rate (%) calculated by the following formula by measuring the main mass of the above-ground parts of the test plants that remained dead at the time of the survey.
Indicated by

lf:, Stomach inhibition rate (%) = Test Example 1 Field soil, stem, and leaf treatment test area: 33 x 23 d % A vat with a depth of 11ω was filled with field soil, and the shortened stems of Creasa and the rhizomes of Mugwort were transplanted and grown for 35 days. . Thereafter, the sample was made into a wettable powder according to Formulation Example 1.

A predetermined amount of the solution was diluted with water equivalent to 5 liters per are containing a spreading agent, and the mixture was uniformly applied from the top of the plant to the entire stem and leaf area using a small sprayer. At this time, the growth status of weeds and crops differs depending on the grass plate, but at the 5-9 leaf stage, the plant height is 2
It was 0 to 60 crn. The herbicidal efficacy was investigated 20 days after the treatment. The results are shown in Table 2.

This test was conducted in a greenhouse throughout the entire period.

jf! 2 The results in Table 2 were analyzed using the iso-effect line method [Fukami order-1 Yasuhiko Uesugi, Shinzo Ishizuka, Choji Tomizawa (eds.) "Pesticide Experimental Methods" Volume 3 Herbicide Edition No. 1
109-111 (1981, published by Soft Science)]. The results are shown in FIGS. 1 and 2. It is clear from the figures that the composition of the present invention has a torturous effect.

Test Example 2 Field soil stem leaf treatment spectrum test area 33x2
3m, depth 11c! Fill an I4 vat with field soil, sow goldenberry, foxtail grass, red grass, commonweed, Japanese sorghum, black-and-white fern, American golden deer, Japanese physalis, Japanese fir, sunflower, whiteweed, and green bean, and transplant the Seiban sorghum rhizomes. , grown for 35 days.

Thereafter, the sample was made into a hydrating powder according to Formulation Example 1, a predetermined amount of it was diluted with water equivalent to 5 liters per are including a spreading agent, and a small sprayer was applied from above the plant body to the whole surface of the stems and leaves. was uniformly processed. At this time, the growth status of each plant and crop varies depending on the grass species, but the 3-8 leaf stage and the plant height are 5-60 cm.
It was α. Herbicidal efficacy was investigated 28 days after treatment. The results are shown in Table 3.

This test was conducted in a greenhouse throughout the entire period.

[Brief explanation of drawings]

1) Figure 1 was drawn using the iso-effect line method based on the herbicidal efficacy against sclera in Table 2 in Test Example 1. ia! 1iIb is the dose of paraquat (dichloride) (f/
a), and the horizontal axis represents the drug 1t (f/a) of compound [I], respectively. Moreover, the broken line represents the line of additive effect, and the solid line represents the line of equal effect with a growth inhibition rate of 70%. 2) Figure 2 is a diagram drawn by the iso-effect line method based on the herbicidal efficacy against mugwort of the second pump in Test Example 1. The vertical axis represents the dose (l/a) of paraquat (dichloride), and the horizontal axis represents the dose (f/a) of compound [). Also, the dashed line is the line of additive effect, and the solid line is the raw mushroom suppression $709
6 isoeffect lines are respectively represented. Compound [I] (a, dish,, f/a) Compound [I] (a, i,, y) Figure 2

Claims (1)

[Claims] 2-(4-chloro-2-fluoro-5-probargyloxyphenyl)-5,6,7,8-tetrahydro-1H
-1,2,4-triazolo-(1,2-a)-pyridazine-1,3-2H-dione and 1,1'-dimethyl-4
, 4'-bipyridinium ion or a salt thereof as an active ingredient.