JPH06157213A - Herbicidal emulsion for paddy field and scattering method for the emulsion - Google Patents

Abstract

PURPOSE:To provide a herbicidal emulsion for paddy field, effective at an extremely low rate of application compared with conventional herbicide, easily applicable to the field and exhibiting high herbicidal effect comparable to the effect of conventional granular herbicide. CONSTITUTION:The herbicidal emulsion for paddy field contains a herbicidal component exhibiting liquid state at normal temperature, a sulfonylurea herbicide component and a surfactant. The present invention also relates to its application process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel herbicidal emulsion for paddy fields and a method for applying the same.

[0002]

2. Description of the Related Art As a pesticide formulation form that has been conventionally used in flooded sewage fields, granules and emulsions (emulsions for pre-rice planting and undiluted solution) are mainly used because of the advantage that they can be easily sprayed as they are. Has been done. Granules are generally applied in an amount of 3 to 4 kg per 10 ares, but in recent years, demand for labor-saving spraying of agricultural chemicals has been increasing, and a small amount of spraying agent for reducing the application amount of the formulation has been required.

On the other hand, for example, an oxadiazone emulsion (generic name) is known as an emulsion (emulsion for spraying a stock solution before rice planting), and this emulsion is directly sprayed on the water surface of a paddy field without being diluted with water. 50 per 10 ares
Used as a small amount spray for 0 ml application. However, conventional emulsions have problems such as chemical damage and ignition due to the contained organic solvent.

From these viewpoints, aqueous suspension preparations have been developed in recent years. (JP-A-62-8
7501, JP-A-62-289502, JP-A-63-107901)

Since water is used as a medium in the above-mentioned aqueous suspension preparation, there is no problem of phytotoxicity, flammability, odor and toxicity to humans and small animals due to organic solvent like emulsion, but long-term storage. Separation, hard caking, etc. easily occur, the formulation is difficult to be completely discharged from the container due to its high viscosity, and the herbicidal active ingredient is solid at room temperature, has low water solubility, and is soluble in water. There is a problem in that it is limited to those that are chemically stable.

[0006]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention The present inventors have used a spraying machine and a special device for the purpose of solving the drawbacks of conventionally used preparations, and reducing the amount of preparations and saving labor during spraying. By spraying directly on the flooded sewage paddy without any action, the herbicidal active ingredient was rapidly emulsified and dispersed in water to uniformly increase the concentration in the paddy water, and found a novel emulsion that exhibits an excellent herbicidal effect. The invention was completed.

[0007]

The present invention will be described in detail below. A herbicidal emulsion for paddy fields characterized by containing a herbicidal active ingredient that is liquid at room temperature, a sulfonylurea herbicidal active ingredient, and a surfactant, and spraying the herbicidal emulsion for paddy fields directly onto the submerged paddy field. And a method for spraying a herbicide for paddy fields.

One of the features of the emulsion of the present invention is that the organic solvent (benzene, toluene, xylene, etc.) which is required in the conventional emulsion is not necessary or required, but the content thereof may be extremely small. .

The emulsion of the present invention can be easily produced by mixing and dissolving a herbicidal active ingredient which is liquid at room temperature, a sulfonylurea herbicidal active ingredient and a surfactant. Further, since the emulsion of the present invention exhibits its excellent self-emulsifying property when contacted with water, it can be sprayed directly at one point or several points on the water surface of the paddy field without the user entering the paddy field. In addition, when spraying this emulsion directly, in consideration of safety such as adhesion to hands and clothes, and chemical damage when the emulsion comes into contact with rice leaves, a bag in which the emulsion is packaged with a water-soluble film is taken into consideration. The same herbicidal effect can be expected when the powdery preparation or capsule is directly sprayed on the flooded paddy field.

Examples of the water-soluble film used in the bag-shaped preparation include polyvinyl alcohol, methyl cellulose,
A polymer film made of a polyethylene glycol derivative or the like can be used, and a film that can be rapidly dissolved in water is suitable. Using these films, the above emulsion can be obtained by packaging, heat sealing or the like.

As the capsule, for example, gelatin or the like can be mentioned as a coating component, and it can be manufactured by a rotary method or the like. Further, the emulsion of the present invention is diluted with a small amount of water, and the diluted solution is used in an amount of 250 to 100 per 10 ares.
It is also possible to spray it directly onto the flooded paddy field so that the amount becomes 0 ml. The herbicidal active ingredient which is liquid at room temperature in the present invention is not particularly limited, but examples thereof include the following.

(1) 2-chloro-2'-6'-diethyl-N- (butoxymethyl) acetanilide (generic name: butachlor), (2) 2-chloro-2 ', 6'-diethyl-N- ( 2-propoxyethyl) acetanilide (generic name: pretilachlor), (3) S- (4-chlorobenzyl) -N, N-diethylthiocarbamate (generic name: ventiocarb), (4) S-benzyl 1,2-
Dimethylpropyl (ethyl) thiocarbamate (generic name: esprocarb),

(5) S-ethylhexahydro-1H-azepine-1-carbothioate (generic name: molinate), (6) O-ethyl-O- (3-methyl-6-nitrophenyl) secondary butylphospho Roamidothioate (generic name: butamiphos), (7) (1RS, 2S
R, 4SR) -1,4-Epoxy-p-mens-2-yl 2-methylbenzyl ether (generic name: cinmethrin) (8) (Z) -N-but-2-enyloxymethyl-2-chloro- 2 ', 6'-Diethylacetanilide (generic name: butenachlor)

Further, the sulfonylurea herbicidal active ingredient of the present invention is not particularly limited, but examples thereof include the following. (1) Ethyl 5- (4,6-dimethoxypyrimidine-
2-ylcarbamoylsulfamoyl) -1-methylpyrazole-4-carboxylate (generic name: pyrazosulfuron-ethyl), (2) methyl α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -O-toluate (generic name: bensulfuron-methyl), (3) 1- (4,6-dimethoxy-1,3,5-
Triazin-2-yl) -3- [2- (2-methoxyethoxy) phenylsulfonyl] urea (generic name: cinosulfuron), (4) N- (2-chloroimidazo [1,2
-A] pyridin-3-ylsulfonyl) -N '-(4
6-dimethoxy-2-pyrimidinyl) urea (generic name:
Imazosulfuron) (5) 1-{[ο- (cyclopropylcarbonyl) phenyl] sulfamoyl} -3-
(4,6-Dimethoxy-2-pyrimidinyl) urea Generally, most of the sulfonylurea herbicidal active ingredients are solid at room temperature, but the herbicidal activity is extremely high as compared with other herbicidal active ingredients, and the amount added to the emulsion is small. Therefore, it is possible to dissolve it in a herbicidal active ingredient which is liquid at room temperature to form an emulsion.

The surfactant in the present invention is not particularly limited, but for example, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene resin acid ester, polyoxyethylene alkyl ether, polyoxyethylene. Fatty acid ester, polyoxyethylene vegetable oil, polyoxyethylene fatty acid amide, polyoxyethylene alkylamine,
Polyoxyethylene polyoxypropylene glycol,
Polyoxyethylene alkylphenyl ether, polyoxyethylene alkylphenyl ether polymer, polyoxyalkylene benzylated phenyl (or phenylphenyl) ether, polyoxyalkylene styrylized phenyl (or phenylphenyl) ether, alkylbenzene sulfonate, dialkyl sulfosuccinate, alkyl Naphthalene sulfonate, naphthalene sulfonate formalin condensate, alkyl sulfate (or phosphate), polyoxyethylene alkyl ether sulfate (or phosphate), polyoxyethylene alkylphenyl ether sulfate (or phosphate), polyoxyalkylene benzylated phenyl (or phenylphenyl) Ether sulfate (or phosphite) Over G), polyoxyalkylene styryl phenyl (or phenyl phenyl) ether sulfate (or phosphate), polyoxyethylene polyoxypropylene glycol sulfate (or phosphate), and the like.

These surfactants may be used alone or in combination of two or more.

The content of the herbicidal active ingredient which is liquid at room temperature is preferably 50 to 98% by weight, more preferably 75 to 95% by weight. The content of the sulfonylurea herbicidal active ingredient is preferably in the range of 0.01 to 20% by weight, more preferably 0.1 to 5%.
It is in the range of% by weight. The content of surfactant is 2
The range is preferably 30 to 30% by weight, more preferably 5
Is in the range of up to 15% by weight.

[0018]

EXAMPLES Next, examples of the present invention will be described, but the present invention is not limited to these examples. All parts are parts by weight.

Example 1 Mix 90.0 parts of Benchocarb (generic name), 0.7 part of pyrazosulfuron-ethyl (generic name), 6.5 parts of polyoxyethylene styryl phenyl ether, and 2.8 parts of calcium alkylbenzene sulfonate. It melt | dissolved and the emulsion of this invention was obtained. Example 2 90.0 parts of butachlor (generic name), 1.3 parts of pyrazosulfuron-ethyl, 6.1 parts of polyoxyethylene styryl phenyl ether, 2.6 parts of calcium alkylbenzene sulfonate were mixed and dissolved to obtain the emulsion of the present invention. Got

Example 3 90.0 parts of esprocarb (generic name), 0.9 part of pyrazosulfuron-ethyl, 6.4 parts of polyoxyethylene styryl phenyl ether, and 2.7 parts of calcium alkylbenzene sulfonate were mixed and dissolved to prepare a mixture. An inventive emulsion was obtained. Example 4 90.0 parts of pretilachlor (generic name), 3.2 parts of pyrazosulfuron-ethyl, 4.8 parts of polyoxyethylene styryl phenyl ether, and 2.0 parts of calcium alkylbenzene sulfonate were mixed and dissolved to obtain the emulsion of the present invention. Got

Comparative Example 1 Bentocarb (general name) 10.0 parts, pyrazosulfuron-ethyl (general name) 0.07 parts, bentonite 30 parts,
58.13 parts of clay, 0.8 part of sodium dialkylsulfosuccinate, 1.0 part of sodium tripolyphosphate, and 15 parts of water were mixed and kneaded with a universal mixer (Dalton Co., Ltd.), and a screen with a diameter of 0.9 mm was attached. Granulation was performed using an extrusion type granulator (BR-200 manufactured by Fuji Paudal Co., Ltd.). The granules were dried at 50 ° C. to obtain granules.

Comparative Example 2 Butachlor (general name) 5.0 parts, pyrazosulfuron-ethyl (general name) 0.07 parts, bentonite 30 parts, clay 63.13 parts, sodium dialkylsulfosuccinate 0.8 parts, tripolyphosphate Sodium 1.0 part, water 15
The parts were mixed and kneaded with a universal mixer (Dalton Co., Ltd.), and then granulated using an extrusion type granulator (BR-200 manufactured by Fuji Paudal Co., Ltd.) equipped with a screen having a diameter of 0.9 mm. The granules were dried at 50 ° C. to obtain granules.

Comparative Example 3 Esprocarb (generic name) 7.0 parts, pyrazosulfuron-ethyl (generic name) 0.07 parts, bentonite 30 parts, clay 61.13 parts, sodium dialkylsulfosuccinate 0.8 parts, tripolyphosphate Sodium 1.0 part, water 1
Five parts were mixed and kneaded with a universal mixer (Dalton Co., Ltd.), and then granulated using an extrusion granulator (BR-200 manufactured by Fuji Paudal Co., Ltd.) equipped with a screen having a diameter of 0.9 mm. The granules were dried at 50 ° C. to obtain granules.

Comparative Example 4 2.0 parts of pretilachlor (generic name), 0.07 part of pyrazosulfuron-ethyl (generic name), 30 parts of bentonite,
66.13 parts of clay, 0.8 part of sodium dialkylsulfosuccinate, 1.0 part of sodium tripolyphosphate, and 15 parts of water were mixed and kneaded with a universal mixer (Dalton Co., Ltd.), and a screen with a diameter of 0.9 mm was attached. Granulation was performed using an extrusion type granulator (BR-200 manufactured by Fuji Paudal Co., Ltd.). The granules were dried at 50 ° C. to obtain granules.

Next, the herbicidal effect of the preparations obtained in the Examples and Comparative Examples and the safety test against paddy rice were tested by the following methods. Test Example 1 Paddy soil was packed in a plastic container of 47 × 40 × 18 cm, and after the soil was scraped, a flooding condition of 4 cm was set. Here, the seeds of Novier, eel, yellow cypress, firefly, and Urikawa, tubers of Mizugaya are planted, and
Six rice seedlings were transplanted. On day 3 after seeding (before development), the formulations of Examples 1, 2, 3 and 4 were applied. For the formulation of the example, a predetermined amount was weighed on a glass plate and treated on the water surface, and for the formulation of the comparative example, granules were uniformly dispersed. On the 42nd day after sowing, observation and investigation were performed according to the following criteria. 0 is no effect, and 9 is a 10-point evaluation showing complete death. The results are shown in Table 1.

In the following Table 1, A to G represent the following plants. A: Paddy rice E: Nectar B: Novier F: Firefly C: Konagi G: Urikawa D: Mizugaya

[0027]

[Table 1] Table 1 ──────────────────────────────────── Formulation dose A B C D EF G g / all ───────────────────────────────────── Example 1 33. 3 0 9 9 9 9 9 9 9 2 16.7 0 9 9 9 9 9 9 9 3 23.3 0 9 9 9 9 9 9 9 4 6.67 0 9 9 9 9 9 9 9 9 Comparative example 1 300 0 9 9 9 9 9 9 9 2 300 0 9 9 9 9 9 9 3 3 300 0 9 9 9 9 9 9 9 9 4 300 0 9 9 9 9 9 9 9 9 ───────────────────── ───────────────

[0028]

INDUSTRIAL APPLICABILITY The herbicidal emulsion for paddy fields according to the present invention has an extremely small amount of application as compared with the conventional ones, is easy to apply, and has the same high herbicidal effect as conventional granules.

Claims (2)

[Claims] 1. A herbicidal emulsion for paddy fields, which comprises a herbicidal active ingredient that is liquid at room temperature, a sulfonylurea herbicidal active ingredient, and a surfactant. 2. A method for spraying a paddy field herbicide, which comprises directly spraying the paddy field herbicidal emulsion according to claim 1 onto a flooded paddy field.