JP2990599B2 - Weeding method of flooded sewer field - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to a method of spraying a suspended herbicide stock solution directly onto a flooded sewage paddy field as it is for weeding.
It is about the law . More specifically, the general formula (I) (Wherein R represents a hydrogen atom or a methyl group;
As sprayed herbicidal concentrate composition containing the pyrazole compound is represented by the phenacyl group or p- methylphenacyl group respectively) as pesticide bulk
And to provide a method for weeding . The present invention is an aqueous <br/> herbicidal concentrate composition, that before planting the flooded Underwater paddy
It is an invention applied by spraying as it is , and has an extremely high herbicidal effect on Urikawa. [0004] In recent years, for the purpose of labor saving of paddy field weeding,
Oxadiazone emulsions (trade name "Lonestar emulsion") and oxadiazon-butachlor emulsions (trade name "Delcut emulsion") have been developed and rapidly spread as pre-planting pre-treatment emulsions that are sprayed from containers as undiluted solutions during scraping work. This weeding method is extremely labor-saving in that it uses a substitute work, which is an essential work in paddy fields. However, these emulsions show a high herbicidal effect from annual weeds such as Nobie, Cyperus japonicus, Konagi, Azena and Kikasugusa to perennial weeds such as fireflies, pine trees and sedges, but are completely effective against perennial broadleaf weeds such as Urikawa, Omodaka and Hirumushiro. There is a drawback that does not show. [0005] On the other hand, these perennial broadleaf weeds are increasing nationwide. In particular, according to a survey conducted in 1982, Urikawa had an area of 37% on average nationwide, and Tokai In the west, it is over 50%. Therefore, in paddy fields where urikawa frequently occurs, systematic treatment with a middle-term herbicide such as a phenothiol / simethrin agent or a simethrin / MCPB agent is required, and a situation is occurring in which the power-saving effect of the pretreatment agent for rice transplantation is greatly reduced. Naproanilide (trade name "Urivest Granule") recently developed to cope with the increased outbreak of Urikawa is effective against Urikawa, but due to phytotoxicity to rice seedlings,
It cannot be used as a rice transplant pretreatment agent. [0006] Against this background, the inventors of the present invention have conducted intensive studies on a pretreatment agent for rice transplanting that can control perennial broadleaf weeds, especially urikawa, at the time of puddling work. A pyrazole compound represented by the general formula (I) is used as a component, and an aqueous suspension
Flooded Underwater paddy herbicidal concentrate composition selected beauty, as the method of application
It has been found that the intended purpose can be achieved by spraying the undiluted liquid composition as it is, and the present invention has been completed. The present invention relates to the following: "1. (A) General formula: (Wherein R represents a hydrogen atom or a methyl group,
Z represents a phenacyl group or a p-methylphenacyl group), and 10 to 50% by weight of a pyrazole compound represented by the formula (B) is used in (C) water using 0.1 to 20% by weight of a surfactant. A bottle in which an aqueous suspension herbicide stock solution composition obtained by suspending the composition is directly filled into a paddy rice field.
Shake by hand while walking, or spread on a tractor, etc.
A method for weeding submerged sewage fields, characterized by spraying with a spreader worn . DETAILED DESCRIPTION OF THE INVENTION Aqueous Suspended Herbicide Used in the Present Invention
The pyrazole-based compound used as the component (A) in the stock solution composition is represented by the general formula (I): (Wherein R represents a hydrogen atom or a methyl group,
Z represents a phenacyl group or a p-methylphenacyl group, respectively.
-28885, JP-A-54-70269, JP-A-57-72
No. 903. Specific examples of the compound represented by the general formula (I) include those represented by the general formula (I): (Hereinafter abbreviated as Compound A), (Hereinafter abbreviated as compound B), and these are preferred. [0016] use in herbicidal concentrate <br/> composition used in the present invention (B) a surfactant of the component, anionic surfactants, there are nonionic surface active agents. Examples of the anionic surfactant include polyoxyethylene alkyl allyl phosphate, polyoxyethylene alkyl allyl ether sulfate, polyoxyethylene styryl phenyl ether sulfate, alkyl allyl sulfonate, lignin sulfonate, alkyl sulfate, dialkyl sulfosuccinate and the like. As nonionic surfactants, for example, polyoxyethylene allyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, sorbitan Examples include, but are not limited to, alkyl esters and the like. These may be used alone or in combination of two or more. It can also be used. The aqueous suspension herbicide stock solution composition used in the present invention is a suspension in which the component (A) is dispersed in the water as the component (C) by the component (B). Aqueous suspension herbicide stock solution which is a stable suspension of
In order to stabilize and / or adjust the viscosity of the product (D)
As a component, a water-soluble polymer or a protective colloid agent can be used. Examples of the water-soluble polymer or protective colloid agent include gum arabic, guar gum, sodium alginate, gelatin, casein, carboxymethylcellulose, xanthan gum, polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone, maleic anhydride-styrene copolymer, hydroxy Ethyl cellulose, methyl cellulose and the like are used. These can be used alone or in combination of two or more. Aqueous suspension herbicide stock solution used in the present invention
The solvent as the component (C) of the product is mainly water and may be water alone. However, when it is necessary to consider physicochemical properties such as cold resistance, heat resistance, viscosity and specific gravity, methyl alcohol, ethyl A hydrophilic solvent such as alcohol, isopropyl alcohol, ethylene glycol, glycerin, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and propylene glycol, or, in some cases, a single solvent selected from hydrophobic solvents such as xylene, toluene, kerosene, and liquid paraffin Alternatively, two or more kinds of organic solvents may be added. In addition, the aqueous suspension herbicide stock solution composition used in the present invention may contain, in addition to the above components, an antifoaming agent such as a silicone-based antifoaming agent and a swelling agent such as bentonite. You may mix. The aqueous suspension herbicide stock solution composition used in the present invention contains the above-mentioned ingredients in an amount of 10 to 50% by weight, preferably 20 to 40% by weight, and 0.1 to 10% by weight, respectively. 20 wt%, preferably 1 to 10 wt%, component (C): balance, component (D): 0 to 10 Wt%, preferably 0.01 to 5 wt%. Preparation of the aqueous suspension herbicide stock solution composition used in the present invention is described in JP-B-46-2051.
9, 58-24401, JP-A-57-58601, 57-159703, 58-124702, 58-
162504 can be carried out by the method described in each of the publications. For example, the solid pesticidal active ingredient (A) is pulverized in advance by a pulverizer such as a jet optimizer, and then the surfactant (B), the water (C), and (D) ) The components or other additives are blended, and the mixture is stirred and mixed with a homogenizer for 10 to 60 minutes to obtain a uniform aqueous suspension of a herbicide stock solution composition. Or, for example, using a high-speed stirrer (A), (B)
And component (C) and, if necessary, component (D) in an amount of 30 to
After mixing for 90 minutes, these mixtures are finely pulverized with a wet pulverizer such as a sand grinder to obtain an aqueous suspension herbicide stock solution composition. Aqueous suspension herbicidal product thus produced
The agent stock solution composition is used by spraying 300 to 1000 ml / 10a of the stock solution in a container as it is at the time of the scraping operation as follows. In the case of hand spraying, in a turbid water state immediately before or immediately after shaking, the bottle is sprayed by hand while shaking while walking. In the case of mechanical spraying, a tractor or the like is equipped with a special spraying machine used for oxadiazone emulsions and the like, and spraying is performed simultaneously with the scraping work. That is, according to the present invention, when treating soil before rice transplanting, (A) general formula (I), general formula (I) (Wherein R represents a hydrogen atom or a methyl group,
Z represents a phenacyl group or a p-methylphenacyl group), and 10 to 50% by weight of a pyrazole compound represented by the formula (B) is used in (C) water using 0.1 to 20% by weight of a surfactant. The suspended aqueous suspension of herbicide stock solution composition was directly poured into a paddy rice field, and a bottle filled with the composition was placed in a paddy field.
Spray by shaking with your hand or attach it to a tractor, etc.
The present invention provides a method for weeding in which soil is buried before rice transplanting by spraying with a sprayer . The formulation of the aqueous suspension herbicide stock solution composition used in the present invention is mainly for weeding perennial broadleaf weeds such as urikawa as a pretreatment agent for rice transplanting in flooded paddy rice fields, but simultaneously weeding a wide range of paddy weeds. In this case, it is effective to spray simultaneously with emulsions such as oxadiazone, butachlor and pretilachlor. Next, a description will be given of an example of the preparation of a stock solution of an aqueous suspension of herbicide used in the present invention , an example of a herbicidal method, and the herbicidal effect . In addition, in each example, a part shows a weight part. Production Example 1 Compound A: 30 parts, ethylene glycol 5 parts, surfactant (polyoxyethylene styryl phenyl ether, dialkyl sulfosuccinate, 1: 1: 1 mixture of polyoxyethylene alkyl ether, respectively): 5 Department,
0.5 parts of xanthan gum and 59.5 parts of water were weighed and added, and mixed with a homogenizer for 40 minutes.
The mixture was wet-milled for 2 hours with a sand grinder to obtain 100 parts of a homogeneous aqueous suspension of herbicide stock solution composition. Production Example 2 Compound B: 30 parts, surfactant (phosphate salt of polyoxyethylene phenyl phenol ether): 2
Part, polyacrylic acid: 0.5 part, bentonite: 1 part,
66.5 parts of water are weighed and added, respectively, mixed by a homogenizer for 40 minutes, and then wet-milled with a sand grinder for 2 hours to obtain a uniform aqueous suspension herbicide stock solution composition:
100 parts were obtained. [0027] Using the paddy fields partitioned in Example 1 (soil incorporation treatment) 1 ° ^{10m 2 (2m × 5 m)} , 1
Weeding was performed in the following manner in three replicates of the test plot .
Weed is good uniform germination in the rough generation oyster One day after to generate barnyardgrass, Rotala indica, vaginalis, one by a certain amount of seeds of bulrush Maki, furthermore, arrowhead, is embedded, the tubers of Cyperus by 20 pieces in one district. One day later, the herbicide stock solution composition prepared in Preparation Example 1 was flooded with water to 3 to 4 cm, and
ml (corresponding to 500 ml / 10a) and immediately stirred with a rake to a depth of about 10 cm from the surface of the soil. Two days after the application of the drug, rice plants at the 2.5 leaf stage were transplanted. Thereafter, water was immersed to a depth of 3 to 4 cm and managed until the survey date. As for the herbicidal effect, 30 days after the chemical treatment, surviving weeds were extracted, and their dry weights were measured and compared with the untreated group. At that time, phytotoxicity to rice was also observed. The results were as shown in Table 1 (displayed as an average of three sections). Simultaneous treatment with a butachlor emulsion was performed in the same manner as in Test Example 1 as a reference example, and the results are shown in Table 1. [Table 1] [0029] Prepare the paddy treated weeds in the same manner as in Example 2 (turbid water treatment) Example 1, Part 1
After 3 days, the water is flooded to 3 to 4 cm and raked from the surface of soil to 10 cm.
Stir to a depth of about cm. Immediately thereafter, 5 ml (50 ml ) of the herbicide stock solution composition prepared in Production Example 1 was directly used.
(Corresponding to 0 ml / 10a). Two days after the application of the drug, rice plants at the 2.5 leaf stage were transplanted. 3-4c afterwards
m and buried until the day of the survey. Herbicidal effect was investigated in the same manner as in <br/> Example 1. The results were as shown in Table 2. [Table 2] That is, when a pyrazole compound represented by the general formula (I) is used as an aqueous suspension herbicide stock solution composition and the stock solution is sprayed as it is at the time of paddling under paddy fields, Although the herbicidal effect on grass weeds such as nobies, fireflies, pine trees, and sedges was significantly reduced, broadleaf weeds such as urikawa, omodaka, hirumshiro, azena, and kikasigusa were extremely high. The effect was recognized.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kiyoshi Sugaya 8-3-1 Chuo, Ami-cho, Inashiki-gun, Ibaraki Pref. Tsukuba Research Laboratory, Mitsubishi Chemical Corporation (56) References JP-A-58-79905 (JP, A) JP-A-54-41872 (JP, A) JP-A-54-70269 (JP, A) JP-B-5-30801 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01N 43/56 A01N 25/04 102 CAPLUS (STN) REGISTRY (STN) WPIDS (STN)

Claims (1)

(57) [Claims] (A) General formula (Wherein R represents a hydrogen atom or a methyl group, and Z represents a phenacyl group or a p-methylphenacyl group, respectively).
(B) a bottle in which 0.1% to 20% by weight of a surfactant is used, and (C) an aqueous suspension herbicide stock solution composition which is suspended in water is directly filled into a flooded submerged paddy field. While walking
Spray by hand or sprayer attached to tractor
A method for weeding a flooded sewage paddy field, characterized by spraying with water.