JPS59144704A - Mixed herbicide - Google Patents

Abstract

PURPOSE:A herbicide that contains 3-chloro-4,5,6,7-tetrahydro-2H-indazole derivative and N-(alpha,alpha-dimethylbenzyl)-alpha'-bromo-t-butylacetamide, thus showing its effect with low amount application. CONSTITUTION:The objective herbicide contains a compound of formula I (R is isopropyl, propargyl) and N-(alpha,alpha-dimethylbenzyl)-alpha'-bromo-t-butylacetamide at a weight ratio of (0.005-0.1):1. The resultant herbicide develops synergism in herbicidal effect to enable low amount application. It shows excellent herbicidal effect against weeds in rice plant paddies such as TAINUBIE, monochoria, toothcup, MIZUGAYATSURI or arrowhead as well as weeds in fields such as nutgrass, moreover it causes no chemical injury to rice plant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compound of the general formula [where k represents an isopropyl group or a propargyl group]. ] This is referred to as an 8-chloro-4,5,6,7-tetrahydro-2H-indazole derivative (hereinafter referred to as compound CI'). ) and N-(α,α-dimethylbenzyl)-αI-
The present invention relates to a herbicidal composition (hereinafter referred to as the composition of the present invention) containing bromo-tert-butylacetamide (hereinafter referred to as the compound) as an active ingredient.

When using herbicides to control weeds in rice fields, fields, orchards, etc., if you do not kill all the various types of weeds as much as possible, the remaining weeds will flourish and inhibit the growth of crops, fruit trees, etc. The full pest control effect will not be achieved. Furthermore, if a large amount of herbicide is applied, more weeds can be killed, but this is not very preferable since it increases phytotoxicity to crops, fruit trees, etc. and causes problems of environmental pollution due to the chemicals.

The characteristics of weed control are that herbicides have a wide range of herbicidal spectrum and are effective against weeds because there are many types of weeds to control and their emergence lasts for a long period of time. , and safe crops are required.

As a result of extensive research to develop herbicides that meet these objectives, the present inventors discovered the compound [■] and the compound [l].
The present invention has been completed based on the discovery that the composition of the present invention containing as an active ingredient has a synergistic herbicidal effect compared to when they are used alone, and can be applied at a lower dosage. did.

The composition of the present invention can be used to eliminate various weeds that are a problem in paddy fields.
For example, weeds of the grass family such as Japanese grass, broad-leaved weeds such as Japanese cabbage, acetifolia, Japanese chickweed, Japanese chickweed, Japanese chickweed, Japanese cypresses such as Tama ga Yatsuri, Hotarui, Pinus spp.
Omodaka exclusive weed weeding [This has an excellent weeding effect and does not cause chemical damage that can cause problems such as moss of rice.

In addition, 1) It also has an excellent weeding effect on upland weeds such as Cyperaceae (grass), which grows up to 1tii m in land.

Compound (I) and compound [
Although the mixing ratio with [I] can be varied within a relatively wide range, it is usually 0.005 to 0.01 parts by weight of compound 1 [I] to 1 part by weight of compound [I].

Table 1 f and the composition of the present invention, the compound which is the active ingredient of the product [■
] is shown.

Table 1 When using the composition of the present invention as a herbicide, it is usually used in the form of emulsions, wettable powders, suspensions, granules, etc. using solid carriers, liquid carriers, surfactants, and other formulation auxiliaries. Formulate.

The emulsion contains 5 to 80 parts by weight of an active ingredient, 5 to 20 parts by weight of a surfactant as an emulsifier, and the remaining amount of a liquid carrier, and if necessary, a rust preventive agent and the like are added. Wettable powder moss, 25 to 90 parts of active ingredient 5-, 5 to 90 parts of surfactant as a dispersant
It contains a 30-fold pupil and a remaining amount of solid carrier, and formulation auxiliaries such as a retention colloid, a thixotropic agent, and an antifoaming agent are added as necessary. The suspension contains 10% of the active ingredient.
Contains ~40 parts by weight, 11 parts by weight, 1 to 20 parts of a surfactant as a wetting agent, and the remaining amount of water. If necessary, formulation auxiliaries such as a protective colloid agent and a thixotropic agent are added.

One granule contains 1 to 35 parts by weight of the active ingredient, 05 to IO parts by weight of a surfactant as a dispersant, and the remaining amount of solid carrier.

Solid carriers include kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite,
There are fine powders or granules such as talc, diatomaceous earth, calcite, walnut powder, urea, ammonium sulfate, and synthetic hydrated silicon oxide, and liquid carriers include aromatic hydrocarbons such as xylene and methylnaphthalene, isopropanol, and ethylene glycol. , alcohols such as cellosolve, ketones such as acetone, cyclohexanone and isophorone, vegetable oils such as soybean oil and cottonseed oil, dimethyl sulfoxide, acetonitrile, water and the like.

Surfactants used for emulsification, dispersion, wet carbonization, etc. include negative salts such as alkyl sulfate salts, alkyl (aryl) sulfonate salts, dialkyl sulfosuccinate salts, and polyoxyethylene alkylaryl ether phosphate salts. ionic surfactant, polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether,
Examples include nonionic surfactants such as polyoxyethylene polyoxypropylene block copolymers, sorbitan fatty acid esters, and polyoxyethylene sorbitan fatty acid esters. Formulation adjuvants include lignin sulfonate, alginate, polyvinyl alcohol, Arabica, C.
Examples include MC (carboxymethyl cellulose) and PAP (isopropyl acid phosphate).

Examples of formulations are shown below. In addition, the active ingredient compound (I)
is indicated by the compound number in Table 1.

Parts indicate parts by weight.

Formulation Example 1 1 part of Compound (1), 49 parts of Compound (IT), 45 parts of synthetic hydrous silicon oxide, 2 parts of sodium lauriul sulfate, and 8 parts of calcium ligninsulfonate are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 Parts of the compound (g o, ), 116 parts of the compound, 1 part of synthetic hydrated silicon oxide, 2 parts of calcium lignosulfonate, 30 parts of bentonite and 60.9 parts of kaolin clay were thoroughly ground and mixed, and water was added. After kneading, the mixture is granulated and dried to obtain granules.

Formulation Example 3 Compound (2) 0.1 part, Compound (11) 20 parts, FoI
J t-1-diethylenestyrylphenyl ether 14
1 part, 6 parts of calcium dodecylbenzenesulfonate, 399 parts of xylene, and 20 parts of cyclohexanone are thoroughly mixed to obtain an emulsion.

These preparations can be used as is or diluted with water, etc., and treated with foliage or soil.

Irrigate.

Furthermore, by mixing it with a herbicide such as Shin, it can be expected that the herbicidal efficacy will be enhanced. In addition, insecticides, acaricides,
It can also be used in combination with nematicides, fungicides, plant growth regulators, fertilizers, soil conditioners, etc.

The application amount of the composition of the present invention varies depending on weather conditions, soil conditions, the formulation form of the composition, the mixing ratio of the active ingredients, the target weeds and crops, etc., but it is usually per 1 are of compound CI) and compound [mouth]. The total amount is 5-252. Emulsions, hydrating agents,
V? Clouding agents etc. are diluted with water before application, while granules etc. are applied as is without any dilution.

The compound of the present invention can be used as an active ingredient in herbicides for wet fields, fields, orchards, pastures, lawns, forests, non-agricultural lands, etc., and the main crops to which it can be applied include corn, These include wheat, rice, soybean, cotton, and sugar beet.

Next, the herbicidal efficacy of the herbicide of the present invention will be specifically illustrated by giving test examples.

Test Example 1 Paddy field soil treatment test A cylindrical plastic pot with a diameter of 14 crn and a depth of 19 cm was filled with soil, and seeds of Japanese millet, broad-leaved weeds (Azaena, Aspergillus japonica, Japanese cypress), Japanese grasshopper, and firefly were added to a depth of 1 to 2 crn. mixed into. After flooding the rice field, add 1 to 2 tubers of Urikawa and Mizugaya spp.
The rice was implanted to the depth of the crn, and then rice at the 8-leaf stage was transplanted and grown in a phylon house at 25 to 80°C. At the first leaf stage of Japanese millet, the test compound was made into an emulsion according to Formulation Example 8, a predetermined amount of the emulsion was diluted with water, and the mixture was dropped onto the water surface at a rate of 10 ml per 1 pot. The herbicidal efficacy was investigated.The results are shown in Table 2.

The herbicidal efficacy is determined by visually observing the degree of germination and growth inhibition of the test plants during the survey, and ``0'' indicates that there is no or almost no difference from when the compound is not used. Those whose growth was completely inhibited were classified into 11 stages from 0 to IO and evaluated as 11O.

The chemical damage to rice was indicated using a 6-level numerical system based on visual observation at the final observation. In this case, the case where the growth is completely or almost the same as that of the untreated area is set as "0", and the case where the growth is withered or completely inhibited is set as "5".
, l, 2, 8, 4. , drug damage was indicated by the number 5.

11-18- Trial example 2 Water] 1 Stem leaf and soil treatment test 115000α
A paddy field was filled with paddy soil in a Wagner bonoto, sowed with Japanese millet and flooded to form a paddy field, which was then cultivated in a 7-iron house at 25 to 30°C. The test compound was made into a wettable powder according to Formulation Example 1, diluted with water, and poured onto the water surface at a rate of 10 mm per pot for 71 Ei.

After being grown in a phylon house for 25 days after dropping, the fresh weight of a portion of the dead and remaining Japanese millet was measured, and the ratio (residue of Japanese millet, grass percentage %) with respect to the case where the compound was not sampled was calculated. The suppression rate (goods) was calculated by subtracting this remaining grass rate (goods) from 100 (goods).The results are shown in Table 3.

Table 3 The results shown in Table 3 were calculated using the isoeffect line method (Hide Chisaka Silk Weed Research 14).
(1972) 12-18),
It is clear that there is a synergistic effect between the two compounds, and the results are shown in Figure 1. This is a method of determining the interaction between the two components of the mixture (in this example, compound [mouth] and compound (1) or (2)) using the line obtained by plotting the combination of Assuming that only additive effects are working during this period, it is assumed that the combination of drug doses necessary to provide a specific level of effect (in this example, the effect of suppressing pine millet by 90%) is based on a theoretical framework. and plot this to obtain the "line of additive effect".

Next, plot the combinations of drug doses that actually caused 90% inhibition to obtain the ``90% isoeffect line''. The content will be judged.

In Figure 1, the 90% isoeffect line is located far below the line of additive 15- effect, indicating that the compound [15-
] and Compounds (1) and (2), it is concluded that there is a synergistic effect.

[Brief explanation of drawings]

The drug amount per are of (2), the horizontal axis shows the drug amount per are of the compound (IT).

Claims (1)

[Claims] General formula [wherein k represents an isopropyl group or a propargyl group]. ] Containing the 3-chloro-4,5,6,7-tetrahydro-2H-indazole derivative represented by and N-(α,α-dimethylbenzyl)-α-bromo-tert-butylacetamide as active ingredients. A herbicidal composition characterized by: