JP2005068121A - Quick-acting fine particle herbicide - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a simply usable herbicide having a potent herbicidal activity only against broad leaf plants, which can expand a herbicidal spectrum of a stem/leaf absorption type protoporphyrinogen oxidase inhibitor-based herbicide used by suspending in water. <P>SOLUTION: The expansion of the herbicidal spectrum and simply usable technology are provided by mixing the stem/leaf absorption type protoporphyrinogen oxidase inhibitor-based herbicide with a herbicide having soil-treating effect or a herbicide having penetrating transfer effect, or with both of the herbicide having the soil treatment effect and the herbicide having the penetrating transfer effect and attaching or impregnating them together with a water soluble organic substance having a high boiling point to fine mineral particles. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for efficiently controlling unnecessary and harmful weeds that grow in a living environment.

  Regardless of farmland or non-agricultural land, the growth of weeds brings about a decline in agricultural productivity and the living environment, and herbicides are widely used as countermeasures. Among them, a compound (hereinafter referred to as a foliar absorption type PPOI agent) that is absorbed from a foliage developed recently and inhibits protoporphyrinogen oxidase kills dicotyledonous plants in a very small amount, and is inexpensive and promptly after spraying. Since it has a characteristic that the effect is manifested, it is widely used as a herbicide in wheat fields and as an agent to dry potato leaves.

As with the foliar absorption type PPOI agent, it is a known technique to use a drug that exhibits an effect only by absorption from foliage as a fine granule. For example, a method is shown in which glufosinate is added to attapulgite or the like and used as a fine granule (see Patent Document 1). Moreover, the method of making a granule strong against a weather change by mixing glufosinate or glyphosate and the herbicide which has soil processing activity is shown (for example, refer patent document 2, patent document 3).
Patent 6-78204 JP 2003-192510 A Long-awaited 2003-192511

  Although the foliage-absorbing PPOI agent has extremely high activity, it has almost no effect other than dicotyledonous plants, so the usage scene is limited. Moreover, since the effect expression after falling to soil cannot be expected, only the dosage form used by suspending in water is used. In addition, the transferability in the plant body was poor, and there was a drawback that the plant was regenerated due to lack of effect on large weeds and uneven dispersion. In addition, glyphosate salts that exhibit an effect only by being absorbed from the foliage have a slow reaction rate, and there is a demand for a drug that reacts faster. Furthermore, it is an important issue to reduce the amount of drug dropped into the environment.

  Granules that are sprayed directly onto the target plant can be sprayed without dilution, enabling easy and safe handling. The present inventors have repeatedly studied on the granulation of the foliar absorption type PPOI agent by adhering to a fine mineral of 0.1 to 0.3 mm using a high boiling point organic substance, or by absorbing it into a mineral with high oil supply ability. It was found that the effect can be greatly stabilized even at a low concentration.

  On the other hand, as a general disadvantage of the fine granules, there is a case where dropping to the soil is prioritized by strong wind and rain, and the adhesion to the leaf surface is restricted, so that the herbicidal effect is lowered. In addition, the foliar absorption type PPOI agent has a defect that it is effective only for limited grass species. Therefore, it is possible to stabilize the effect by mixing a soil-treated herbicide that exhibits an effect even after falling on the soil or a herbicide having osmotic transfer activity, or by mixing both a soil-treated herbicide and an osmotic transfer herbicide. It is necessary to plan. At the same time, the herbicidal spectrum can be expanded by mixing different herbicides.

Typical foliage absorption type PPOI agents include carfentrazone ethyl, pyraflufen ethyl, butaphenacyl and the like.
Examples of soil treatment type herbicides to be mixed with these agents are photosynthesis inhibiting herbicides such as isouron, carbylate, diuron, tarbacil, tebuthiuron, bromacil, and metribuzin. By mixing these photosynthesis inhibitors, not only dicotyledonous but also monocotyledonous plants can be quickly killed. Also, ethoxysulfuron, cyclosulfamuron, synosulfuron, nicosulfuron, halosulfuron methyl, pyrazosulfuron ethyl, flazasulfuron, metsulfuron methyl, florasulam, imazaquin, imazapill, which have both soil treatment effect and penetration transfer effect from foliage And acetolactate synthesis inhibiting herbicides such as Among these, when mixed with an acetolactate synthesis inhibitor excluding imazaquin and imazapill, dicotyledonous plants can be selectively killed. On the other hand, if imazaquin, imazapill, etc. are used, a non-selective herbicidal effect can be brought about. Acetolactate synthesis inhibitors generally have a drawback that their effects are slow and their effects on large plants are poor. However, mixing with a foliar absorption type PPOI agent greatly improves these drawbacks. As the osmotic transfer type foliar treatment agent, an herbicide of an amino acid synthesis inhibiting system having high osmotic transfer property and slow effect expression such as glyphosate salts is preferable. On the other hand, when the foliar absorption type PPOI agent is mixed only with these amino acid synthesis inhibitors, the soil treatment effect and the residual effect can hardly be expected. It is necessary to mix with an acetolactate-inhibiting herbicide or the like. By using these herbicides having different functions in combination, it is possible to use each drug below the general usage amount. The content varies depending on the drug, but is 0.005 to 5% by weight.

  To load a foliage-absorbing PPOI agent into minerals, drop or spray a powder, solution, or suspension of a high-boiling organic substance and foliage-absorbing PPOI agent into a stirring mineral carrier. Can be easily manufactured.

  As the mineral carrier to be used, attapulgite, quartzite, calcined diatomaceous earth, zeolite, sepiolite, calcium carbonate, montmorillonite and the like can be used. The finer the particle size of the granule, the higher the adhesion efficiency to the leaf surface. However, when the wind is strong, the fine particles may scatter and cause phytotoxicity to surrounding plants. On the other hand, when it is rough, adhesion to the leaf surface is lowered and it is difficult to obtain a sufficient effect. Accordingly, a particle size of 0.1 to 0.3 mm, which is classified as a fine granule in Japan, is preferable.

  In order to attach the active ingredient to the mineral carrier, it is important to use a high boiling point organic substance. When a low-boiling organic solvent, water or the like is used alone, these solvents are volatilized from the carrier and the agrochemical base is detached from the carrier, which is not preferable. However, these solvents, which can be easily removed by drying, can be used for the purpose of reducing the viscosity of high-viscosity organic substances in the manufacturing process and for the purpose of dissolving other agrochemical ingredients uniformly on the carrier. It is. Examples of high-boiling organic substances include ethylene glycol, higher alcohol, higher fatty acid ester, mineral oil, dimethyl sulfoxide, vegetable oil, propylene glycol, polyethylene glycol, polypropylene glycol, propylene glycol monomethyl ether, 1-methylpyrrolidone and other solvents, carboxymethyl cellulose , Pastes such as dextran, polyvinyl alcohol, and polyvinyl pyrrolidone, and various surfactants can be used. In particular, surfactants not only help adhere the foliar-absorbing PPOI agent to the carrier mineral due to the high viscosity, but also promote the spread of the spread active ingredient on the plant body and the rapid penetration into the plant body. Has the function of stabilizing.

  There are many surfactants. For example, anionic surfactants include alkylbenzene sulfonate, alkylnaphthalene sulfonate, dialkyl sulfosuccinate, dialkyl phosphate, fatty acid salt, polyacrylic acid salt, polycarboxylic acid salt. Acid salts, monoalkyl phosphates, lignin sulfonates and the like. Cationic surfactants include alkyldimethylbenzalkonium chloride, alkyltrimethylammonium chloride, alkylpentamethylpropylenediamine dichloride, alkyl-N-methylpyridinium bromide, benzethonium chloride, polyoxyethylene alkylamine, methyl polyoxyethylene alkylammonium And chloride. Nonionic surfactants include sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl phenyl ether formalin condensate, polyoxyalkylene benzyl phenyl ether, polyoxyethylene fatty acid ester, And polyoxyethylene sorbitan fatty acid ester. Examples of zwitterionic surfactants include alkylbetaines. The water-soluble high-boiling organic substance containing a surfactant is used alone or as a mixture, and the amount used is 0.1 to 10% by weight based on the total weight of the preparation.

  When the granule is easily consolidated by using a high-viscosity organic substance, it can be prevented by adding 0.5 to 5% by weight of fine powder such as porous silicic acid.

  While maintaining the fast-acting effect by mixing the herbicide with a soil-absorbing type protoporphyrinogen oxidase-inhibiting herbicide suspended in water with a herbicide that has a soil treatment effect or an osmotic transfer effect into a fine granule It stabilizes the effect and expands the slaughter spectrum, and at the same time enables easy use.

  Embodiments of the invention will be described based on formulation examples.

Formulation Example 1

Preparation of mixed fine granules of 0.01% pyraflufenethyl and 2.0% bromacil

  While stirring 444.4 g of fine zeolite (Zeogreen Fine Granule No. 8, product of Nippon Zeolite Co., Ltd.) at 350 rpm in a stirring tank of Mechanomyl (granulation coating machine, Okada Seiko Co., Ltd. product) X wettable powder, DuPont Co., Ltd. product) 13 g was added and mixed for 1 minute. Next, 2.6 g of pyraflufenethyl 2% wettable powder (Ecopart Floorable, Nippon Pesticide Co., Ltd.) and dioctyl sulfosuccinate (Jelapon DOS / PC-65, Rhodia Nikka Co., Ltd.) were mixed. Things were added slowly. Subsequently, 10 g of porous silicic acid (Carplex XR, manufactured by Shionogi Pharmaceutical Co., Ltd.) was added and removed after stirring for 1 minute, air-dried and sieved to 0.1 to 0.3 mm particles to obtain 491 g of fine particles. It was.

Formulation Example 2

Preparation of Carfentrazone 0.02%, Bromasil 1.0% mixed fine granules

  While rotating 448 g of fine zeolite at 350 rpm in a mechanomill stirring tank, 6.5 g of bromacil 80% wettable powder was added and mixed for 1 minute. Subsequently, 0.5 ml of carfentrazone ethyl 21.3% emulsion (Quick silver, product of FMC Co., Ltd.), 20 g of 78% polyoxyethylene dodecyl ether (Surfactant WK, product of Kao Corporation) and 15 g of polypropylene glycol were mixed. Things were added slowly. Subsequently, 10 g of porous silicic acid was added, taken out after stirring for 1 minute, and air-dried to obtain 490 g of fine particles obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 3

Preparation of mixed fine granules of 0.01% pyraflufenethyl and 3.0% diuron

  Charge 434.3 g of fine zeolite into a mechano-mill stirring tank, add 20 g of diuron 78.5% wettable powder (Carmex D wettable powder, Nagase Griffin Co., Ltd.) while rotating at 350 rpm, and mix for 1 minute. . Subsequently, 2.6 g of pyraflufenethyl 2% wettable powder, 20 g of polyoxyethylene sorbitan monolauryl ester (product of Tokyo Chemical Industry Co., Ltd.) and 15 g of polypropylene glycol were slowly added. Subsequently, 10 g of porous silicic acid was added, taken out after stirring for 1 minute, taken out and air-dried to obtain 488 g of fine particles obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 4

Preparation of fine powder of pyraflufenethyl 0.01%, terbacil 1%

  A mechano-mill agitation tank was charged with 475.9 g of fine silica (silica sand V7, product of Mikawa Silica Co., Ltd.) and 6.5 g of Turbacil 80% wettable powder (Simber wettable powder, product of DuPont Co., Ltd.) at 350 rpm for 1 minute. Spin to mix. Subsequently, a mixture of 2.6 g of pyraflufenethyl 2% wettable powder with 10 g of polyoxyethylene sorbitan monooleyl ester (product of Tokyo Chemical Industry Co., Ltd.) was slowly added with stirring. Next, 5 g of porous silicic acid was added and the mixture was stirred for 1 minute, then taken out, air-dried, and 486 g of fine particles obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 5

Preparation of fine granules containing 0.01% pyraflufenethyl, 2.0% diuron and 1.0% bromacil

  A mechano-mill stirring tank was charged with 462.4 g of fine zeolite, and a mixture of 2.6 g of pyraflufenethyl 2% wettable powder and 25 g of 78% polyoxyethylene dodecyl ether was slowly added while stirring at 350 rpm. Subsequently, 10 g of porous silicic acid was added, taken out after stirring for 1 minute, taken out and air-dried to obtain 488 g of fine particles obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 6

Preparation of fine powder of 0.01% pyraflufenethyl, 1% lenacyl and 2% diuron

  A mechano-mill stirring tank was charged with 452.9 g of fine zeolite, 6.5 g of Lenacil 80% wettable powder (Lenzer wettable powder, DuPont product) and 13 g of diuron 78.5% wettable powder, and rotated at 350 rpm for 1 minute. Allowed to mix. Subsequently, a mixture of 2.6 g of pyraflufenethyl 2% wettable powder and 15 g of 78% polyoxyethylene dodecyl ether was added. Subsequently, 10 g of porous silicic acid was added, taken out after stirring for 1 minute, and air-dried to obtain 485 g of a fine granule obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 7

Preparation of fine granules of 0.01% pyraflufenethyl and 0.008% metsulfuronmethyl

  A mesomill agitation tank was charged with 475.4 g of fine zeolite and pulverized while rotating at 350 rpm. 60% wet weight of metsulfuron methyl (Saber DF agent, Maruwa Biochemical Co., Ltd.) in 20 times the amount of polyethylene glycol. A mixture of 2 g of the dispersed product and 5 g of 50% polyoxyethylene hexitan fatty acid ester (Approach BI, Kao Corporation product) was slowly added. Subsequently, 2.6 g of pyraflufenethyl 2% wettable powder and 5 g of polyoxyethylene polyoxypropylene lauryl ether (Wonder Surf 100 Aoki Yushi Kogyo Co., Ltd.) were added. Next, 10 g of porous silicic acid was added, and the mixture was stirred for 1 minute, then taken out, air-dried, and 486 g of fine particles obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 8

Preparation of fine powder of pyraflufen ethyl 0.01%, bromacil 1%, metsulfuron methyl 0.008%

  A mechano-mill stirring tank was charged with 458.9 g of fine zeolite and 6.5 g of bromacil 80% wettable powder, and mixed by rotating at 350 rpm for 1 minute. Next, 2 g of pulverized metsulfuron methyl 60% wettable powder dispersed in 20 times amount of polyethylene glycol and 5 g of 50% polyoxyethylene hexitan fatty acid ester were slowly added. Subsequently, a mixture of 2.6 g of pyraflufenethyl 2% wettable powder and 15 g of 78% polyoxyethylene dodecyl ether was slowly added. Next, 10 g of porous silicic acid was added and the mixture was stirred for 1 minute, taken out, air-dried, and 485 g of a fine granule obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 9

Preparation of fine granules of 0.01% pyraflufenethyl, 1% bromacil, 0.15% cyclosulfamuron

  A mechano-mill stirring tank was charged with 448.2 g of fine zeolite, 6.5 g of bromacil 80% wettable powder and 7.7 g of cyclosulfuron 10% wettable powder (double up wettable powder, BASF Agro Co., Ltd. product) at 350 rpm. Rotate for 1 minute to mix. Subsequently, a mixture of 2.6 g of pyraflufenethyl 2% wettable powder and 25 g of 78% polyoxyethylene dodecyl ether was slowly added. Next, 10 g of porous silicic acid was added, and the mixture was stirred for 1 minute, then taken out, air-dried, and 486 g of fine particles obtained by sieving 0.1 to 0.3 mm particles.

Formulation Example 10

Preparation of fine granules of 0.01% pyraflufenethyl, 2.0% glyphosate, 1.0% bromacil

  While stirring 444.5 g of finely divided zeolite at 350 rpm, 6.5 g of bromacil 80% wettable powder was charged in a mechano-mill stirring tank and mixed by rotating at 350 rpm for 1 minute. Next, a mixture of 25 g of glyphosate ammonium salt 41% (round-up high-load solution, Nissan Chemical Industries, Ltd.), 2.6 g of pyraflufenethyl 2% wettable powder, and 10 g of 78% polyoxyethylene dodecyl ether Was added slowly. Next, 10 g of porous silicic acid was added and the mixture was stirred for 1 minute, taken out, air-dried, and 485 g of a fine granule obtained by sieving 0.1 to 0.3 mm particles.

Comparative Formulation Example 1

Preparation of pyraflufenethyl 0.01% fine granules

  To a stirring tank of the mechanomill, 482.4 g of fine silica was rotated at 350 rpm, and a mixture of 2.6 g of pyraflufenethyl 2% wettable powder and 10 g of 78% polyoxyethylene dodecyl ether was slowly added. Subsequently, 5 g of porous silicic acid was added, and the mixture was stirred for 1 minute, taken out, air-dried, and 488 g of fine particles obtained by sieving 0.1 to 0.3 mm particles.

Comparative formulation example 2

Preparation of carfentrazone ethyl 0.01% fine granules

  To a mechano-mill stirring tank, 484.7 g of fine silica was rotated at 350 rpm, and 0.3 ml of carfentrazone-ethyl 21.3% emulsion and 10 g of 78% polyoxyethylene dodecyl ether were slowly added. Next, 5 g of porous silicic acid was added and the mixture was taken out after stirring for 1 minute, air-dried, and 489 g of fine particles obtained by sieving 0.1 to 0.3 mm particles were obtained.

Comparative Formulation Example 3

Preparation of pyraflufen ethyl 0.01%, glyphosate 2.0%, fine granules

  While stirring 447.4 g of fine zeolite at 350 rpm, 25 g of glyphosate ammonium salt solution 25 g, pyraflufenethyl 2% wettable powder 2.6 g, and 78 g of polyoxyethylene dodecyl ether 15 g were mixed in a stirring tank of mechanomyl. Things were added slowly. Next, 10 g of porous silicic acid was added, and the mixture was stirred for 1 minute, taken out, air-dried, and sieved for 0.1 to 0.3 mm particles to obtain 484 g of fine particles.

  The herbicidal effects of the above Formulation Examples 1 to 10, Comparative Formulation Examples 1 to 3, and the control drug on plants were compared in the pot test and the field.

Herbicidal effect test example 1

Pot test

The amount of 20 g per square meter of the fine granules prepared in the above-mentioned preparation examples and comparative preparation examples and the commercially available control drug Bromasil 1.5% granules was sprayed on a 7-12 cm plant length cultivated in a 200 cm ² plastic container. The commercially available control drug Ecopart 2% wettable powder was diluted with water and sprayed in an amount of 150 ml per square meter and an active ingredient amount equivalent to 2 mg. Water was supplied from the bottom for the first week and then sprinkled from the top of the leaves and managed in a warming frame house. The herbicidal effect was evaluated by the degree of reaction to the drug and the presence or absence of regeneration after 3 days and 4 weeks of treatment. The test was performed in duplicate for each plant. The results are shown in Table 1.

Herbicidal effect test example 2

Outdoor test

Fields in the Tonoyama area of Tsukuba City, Ibaraki Prefecture, where Shiraza and Suzuhiyu, which have a height of 30 cm or less, have priority, and Shiroza and Surihiyu of 20 cm or less are separated by a frame of 500 cm ² , 1.5% The granule was sprayed in an amount equivalent to 20 g per square meter in each section. The commercially available control drug Ecopart 2% wettable powder was diluted with water and sprayed in an amount of 150 ml per square meter and an active ingredient amount equivalent to 2 mg. The herbicidal effect was evaluated by the degree of response to the drug per area after 1 week and 6 weeks of treatment. In addition, more than 30% of the grass species remaining in the untreated area was investigated. The test was conducted on June 17, 2003 as two repeats of each agent. The average value of the results is shown in Table 2.

  As is clear from the above test examples, herbicides having a soil treatment effect or herbicides having a osmotic transfer effect on herbicide type protoporphyrinogen oxidase inhibitor herbicides, or herbicides having a soil treatment effect and osmotic transfer By mixing both herbicides that have an effect and adhering or impregnating fine minerals with high-boiling organic substances, it is possible to use herbicide granules that have a simple, fast-acting and stable effect and a broad herbicidal spectrum. I made it.

Claims (4)

  Protoporphyrinogen oxidase-inhibiting herbicides that are absorbed from the foliage and exhibiting effects and photosynthesis-inhibiting herbicides are selected from one or two selected from isouron, carbylate, diuron, tarbacil, tebuthiuron, bromacil, and metribuzin A herbicidal composition mixed and supported on a mineral having a particle size of 0.1 to 0.3 mm.   Protoporphyrinogen oxidase-inhibiting herbicides and acetolactate synthesis-inhibiting herbicides that are absorbed from the foliage and exhibit effects, ethoxysulfuron, cyclosulfamuron, sinosulfuron, nicosulfuron, halosulfuron methyl, pyrazosulfuron ethyl, A herbicidal composition in which one or two selected from flazasulfuron, metsulfuron methyl, flora slam, imazaquin, and imazapill are mixed and supported on a mineral having a particle size of 0.1 to 0.3 mm.   A protoporphyrinogen oxidase-inhibiting herbicide that is absorbed from the foliage and exhibits an effect, and a photosynthesis-inhibiting herbicide according to claim 1, or an acetolactate synthesis-inhibiting herbicide according to claim 2, or an amino acid synthesis-inhibiting herbicide A herbicide composition in which two herbicides selected from glyphosate salts as calligraphic herbicides are mixed and supported on a mineral having a particle size of 0.1 to 0.3 mm.   4. The herbicidal composition according to claim 1, wherein the protoporphyrinogen oxidase-inhibiting herbicide that is absorbed from the foliage and exhibits an effect is pyraflufenethyl, carfentrazone ethyl, or butaphenacyl. .