JP2012126754A - Herbicide for lawn reducing harmful side effect of medicine to japanese lawn grass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a herbicide having high safety to Japanese lawn grasses, which reduces harmful side effects of medicine to Japanese lawn grasses and has herbicidal effect to weeds growing in Japanese lawn grasses while using a triazine herbicide having no selectivity to Japanese lawn grasses.SOLUTION: The herbicide for a lawn contains cyanazine as an active constituent, and has the form of a granule with a grain size of 0.5 to 1.0 mm.

Description

  The present invention relates to a method for reducing phytotoxicity against Japanese turf by making a granule or fine granule, which is a preparation containing a triazine herbicide and completely treating soil.

  As a lawn herbicide, a lawn weed control composition containing a triazole derivative as an active ingredient has been reported for turf and Japanese turf (see, for example, Patent Document 1). Lawn herbicides for Japanese turf that control grass annual weeds and broad-leaved weeds and contain isoproturon as an active ingredient have also been reported (for example, see Patent Document 2). In the examples in these patent documents, the preparation forms are all liquids such as wettable powders, flowables, emulsions, and suspoemulsions.

  Triazine herbicides that have physiological selectivity for Japanese turf, such as atrazine and simazine, are used in large quantities regardless of the time of use because they have no phytotoxicity to Japanese turf. For this reason, there are areas where usage is restricted or prohibited.

  On the other hand, while having the same basic chemical structure, it has a high weeding effect on weeds in the turf, but because it is not safe enough for Japanese turf, cyanadine treats low doses in late autumn when Japanese turf witheres in the winter. It is used in extremely restricted ways to control annual broadleaf weeds in Japanese turf.

  A turf pre-emergence soil treatment herbicide for reducing phytotoxicity has also been reported (see, for example, Patent Document 3). Although the migration distance of the herbicide in the soil is decreased by spraying the vinyl acetate polymer emulsion, there is a concern that a part of the polymer remains in the soil.

JP-A-9-124417 JP 2001-199814 A JP-A-9-77609

  The present invention occurs in Japanese turf by using an active ingredient that has no physiological selectivity among Japanese triazine herbicides and is a granule or fine granule that is a soil treatment preparation. The object of the present invention is to provide a herbicide with high safety against Japanese turf that has a herbicidal effect on weeds and has reduced phytotoxicity against Japanese turf.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention completely treated an active ingredient having no physiological selectivity with respect to Japanese turf among triazine herbicides, It was found that by absorbing from the roots of turf and weeds in the turf, physiological selectivity to Japanese turf appeared, there was no phytotoxicity to Japanese turf, and weeds in the turf could be controlled, and the present invention was completed.

  That is, the present invention is a lawn herbicide which contains cyanazine as an active ingredient and has a form of granules having a particle size of 0.5 to 1.0 mm.

  The content of cyanazine in the lawn herbicide of the present invention is 0.1% to 10%. The herbicide of the present invention is one of monochlorotriazine herbicides. The monochlorotriazine herbicide is a herbicide having a chloro group at the 2-position and a substituted amino group at the 4-position and the 6-position of the triazine skeleton. Among the herbicide active ingredients of monochlorotriazine herbicides that do not have physiological selectivity for Japanese turf, preferred are cyanazine, the chemical name 2- (4-chloro-6-ethylamino-1,3,5- Triazin-2-yl) amino-2-methylpropionitrile.

  As a preparation for the complete soil treatment of the present invention, the active ingredient is absorbed from the roots of Japanese turf and weeds in the turf by formulating into granules or fine granules and converted into a complete soil, thereby making it physiological to Japanese turf. Despite being an active ingredient of monochlorotriazine herbicides that do not have selectivity, physiological selectivity to Japanese turf appears, there is no phytotoxicity to Japanese turf, and weeds in turf can be controlled. is there.

  According to the present invention, a monochlorotriazine herbicide, which is a wettable powder by spraying a granule or fine granule containing an active ingredient having no physiological selectivity to Japanese turf into the turf. Or it can reduce phytotoxicity against Japanese turf compared with sol, has excellent safety against Japanese turf, and shows high herbicidal effect against annual grasses and annual broad-leaved weeds in turf. can do.

  As a herbicide formulation, a granule or fine granule is used in which the formulation does not adhere to the Japanese turf stalk and leaves and most of the treated formulation falls to the soil.

  As a carrier of granules and fine granules, bentonite, diatomaceous earth, dry clay, wet clay, talc, zeolite, quartzite, quartz sand, calcium carbonate, olivine sand, vermiculite, shirasu attapuljanite, wax stone, acid clay, activated clay, Although there is fly ash etc., it can be used alone or in combination of two or more.

  As surfactants to be mixed with granules and fine granules, specifically as an activator for granules and fine granules, in anionic systems, alkyl sulfates, polyoxyethylene alkyl ether sulfates, sulfosuccinates are generally used. Acid salt, phosphate ester type, alkylbenzene sulfonate, and naphthalene sulfonate formalin condensate can be used. In the nonionic system, polyoxyethylene alkyl ether type, polyoxyethylene fatty acid ester type, polyoxyethylene sorbitan fatty acid ester type, and polyoxyethylene polyoxypropylene alkyl ether type can be used.

  The addition amount of the surfactant is anionic or nonionic, or a combination of two or more, and 0.5 to 10 parts of the surfactant is selected and added according to the physical and chemical characteristics of the active ingredient. .

Example 1
[Production of granules]
First, powdered cyananadine active substance 5.0 parts, bentonite-Na 30 parts, Katsumiyama clay 62 parts, sodium tripolyphosphate 1.0 part, activator Solpol 5060 (sulfonate type / phosphate combination product). 0 parts were charged, and a table type double arm kneader (PNV-5 type: manufactured by Irie Shokai) was rotated at about 25-51 rpm / minute to thoroughly mix the powder, and then the liquid activator Peganol TH-6 (POE tridecyl ether: manufactured by Toho Chemical Co., Ltd.) 1.0 part, 10-20% of water as a water content was added and kneaded sufficiently. When it became a moist dumpling, it was taken out from the kneader and set to a dome gran DG-L1 type (manufactured by Fuji Powder Co., Ltd.) with a dome die screen diameter of 0.8 mm and extruded and granulated. The granulated wet granule is spread on a vat and naturally dried for 10 to 60 minutes, and then the granulated granule is sized and dried for 3 hours at 70 ° C or less using a circulating thermostatic dryer. did. After drying, a sieve shaker 300-MM2 type (manufactured by Tsutsui Rikagaku Co., Ltd.) is placed on a 1000-micron, 500-micron tray, and shaken to give a lump of 1000 to 500 microns. Foreign matter and powder were removed to obtain a cyanazine 5% granule with a yield of 95%.

(Example 2)
[Preparation of fine granules]
Add 3 parts of cyananadine powder which is micronized to 10 microns or less to 93.5 parts of fine zeolite carrier within the range of 180 to 710 microns, and make a New Gramachine mixer (SEG-350 type Seisin Enterprise Co., Ltd.) While rotating the rotating blade at about 200 to 300 rpm / min, 1.0 part of the activator Peganol TH-8 (POE lauryl ether: manufactured by Toho Chemical Co., Ltd.) and 2.0 parts of propylene glycol were added dropwise or sprayed. Then, after uniformly adsorbing and adsorbing on the surface of the fine particles, 0.5 part of Carplex was further added to impart fluidity to the fine particles. This fine granule is placed on a sieve shaker 300-MM2 platform with 1000 and 180 micron trays placed on top of each other and shaken to remove particles of 1000 to 180 microns and yield rate. A 95% cyanazine 3% fine granule was obtained.

(Example 3)
[Production of spray granules]
90 parts of galeonite kneaded granular particles with a particle diameter of 500 to 1000 microns are charged into an Eirich Intitive Mixer Mixer (RV02E model made by Nihon Eirich Co., Ltd.), and the rotating blades of the mixer are set at about 100 to 150 rpm. An aqueous suspension dispersion of cyanazine (component amount 50%) that was wet-pulverized to a particle size of 1 to 3 microns with a separate wet-type pulverizer (Dynomill KDL type Shinmaru Enterprises Co., Ltd.) 10 parts were sprayed and adsorbed and impregnated on granular empty balls to obtain sprayed cyananadine 5% granules with a yield of 98%.

Example 4
[Drug injury test of triazine herbicides against Pleurotus edulis]
In Ibaraki Prefecture, a 1m x 1m section was prepared in the Koraishiba field, which is being managed for customary growth in June, and seedlings were seeded in the section.
Using the cyananadine 5% preparation prepared by the method according to Examples 1, 2, and 3, the prescribed application rate was uniformly sprayed in the compartment at the beginning of June when the bark was grown to 2 leaves.
As a comparative agent, a commercially available cyananadine wettable powder (trade name: Gramex wettable powder) was diluted with 200 ml of tap water sprayed per square meter and sprayed uniformly in the compartment with an electric sprayer.
11, 20, and 38 days after the drug treatment, the degree of phytotoxicity against cucumber shiba and the herbicidal effect against barnyard grass was observed and investigated to examine the effectiveness of this drug. At the same time, we investigated the degree of herbicidal effect on the broadleaf weed, Konishisou.
The results are as shown in Table-1.

The weeding effect on the weeds in the turf was performed according to the following observation criteria.
0: No herbicidal effect is observed as in the untreated area.
1: The control effect of about 20% is shown with respect to an untreated area.
2: Shows a control effect of about 40% with respect to the untreated section.
3: About 60% of control effect is shown with respect to an untreated area.
4: Shows a control effect of about 80% with respect to the untreated area.
5: Completely dead.

The investigation of the degree of phytotoxicity on Japanese turf was conducted according to the following observation criteria.
0: Same as untreated zone (no effect)
1: There are slight phytotoxic symptoms 2: To the extent that phytotoxic symptoms are observed and judged to be impractical 3: To the extent that moderate phytotoxic symptoms are observed and judged to be impractical 4: The phytotoxic symptoms are enormous and impractical Degree 5: Degree of complete death due to phytotoxic symptoms

(Example 5)
[Pharmacotoxicity test against Noshiba]
In Ibaraki Prefecture, a 1m x 1m plot was made in a Noshiba field, which is undergoing customary growth management in June, and barnyard grass was seeded in the plot.
Using a cyananadine 5% preparation prepared by a method according to Examples 1, 2, and 3, a predetermined application rate was uniformly sprayed in the compartment at the beginning of June, when the bark was grown to 2 leaves.
As a comparative agent, a commercially available cyananadine wettable powder (trade name: Gramex wettable powder) was diluted with 200 ml of tap water sprayed per square meter and sprayed uniformly in the compartment with an electric sprayer.
11, 20, and 38 days after the drug treatment, the degree of phytotoxicity to horned buckwheat and the level of herbicidal effect on bark beetle were observed and investigated, and the efficacy of this drug was investigated. At the same time, we investigated the degree of herbicidal effect on the broadleaf weed, Konishisou.
The results are as shown in Table-2.

According to the present invention, even a monochlorotriazine herbicide that is an active ingredient having no physiological selectivity for Japanese turf is sprayed into the lawn as a granule or fine granule, Can reduce phytotoxicity against Japanese turf compared to Japanese or sols, has superior safety against Japanese turf, and has high weeding against annual grasses and broad-leaved weeds in grass. Demonstrate the effect.

The present invention relates to a herbicide for lawn that reduces the phytotoxicity to Japanese turf by making it a granule having a particle size of 0.5 to 1.0 mm, which is a preparation containing cyananadine and completely treating soil.

The present invention uses active ingredients with no physiological selectivity to Japanese lawn among triazine herbicides, by the granules is soil treatment formulation, herbicidal effect against weeds growing in the Japanese lawn The purpose of the present invention is to provide a herbicide with high safety against Japanese turf that has reduced phytotoxicity against Japanese turf.

The present inventors have made extensive and intensive studies to solve the problems described above, the cyanazine an active ingredient having no physiological selectivity to Japanese lawn among triazine herbicides completely soil treatment, cyanazine Has been found to be able to control the weeds in the turf without causing any phytotoxicity to the Japanese turf due to the absorption of the turf from the roots of the Japanese turf and the weeds in the turf. It was.

The content of cyanazine in the lawn herbicide of the present invention is 0.1% to 10%. The herbicide of the present invention is one of monochlorotriazine herbicides. The monochlorotriazine herbicide is a herbicide having a chloro group at the 2-position and a substituted amino group at the 4-position and the 6-position of the triazine skeleton. Among the herbicide active ingredients of monochlorotriazine herbicides that have no physiological selectivity to Japanese turf , in the present invention, cyanazine, chemical name 2- (4-chloro-6-ethylamino-1,3,5) -Triazin-2-yl) amino-2-methylpropionitrile is used .

As a preparation for the complete soil treatment of the present invention, it is formulated into a granule with a particle size of 0.5 to 1.0 mm and treated with a complete soil, thereby absorbing cyananadine from the roots of Japanese turf and turf weeds. despite the effective component have a have a physiological selectivity to grass, physiological selectivity appeared on Japanese turf, no phytotoxicity against the Japanese lawn, it is possible to control weeds in turf It is.

According to the present invention, there is provided a monochlorotriazine herbicides containing cyanazine as an active ingredient having no physiological selectivity to Japanese lawn, a particle size 0.5 to 1.0mm granules, grass It can reduce the phytotoxicity against Japanese turf by spraying in the ground compared to wettable powder or sol, has excellent safety against Japanese turf, 1st year grass weed and 1st year broadleaf High herbicidal effect can be exerted on weeds.

As a herbicide formulation, a granule with a particle size of 0.5 to 1.0 mm, which is a formulation in which most of the treated formulation does not adhere to the turf of Japanese turf and falls to the soil, is employed. The

The carrier granules, bentonite, diatomaceous earth, dry clay, wet clay, talc, zeolite, silica, silica sand, calcium carbonate, olivine sand, vermiculite, shirasu attapulgite Ja Knight, pyrophyllite, acid clay, activated clay, fly ash and the like However, it can be used alone or in combination of two or more.

As the surfactant to be mixed with the granule, specifically as an activator for the granule , generally in the anionic system, alkyl sulfate, polyoxyethylene alkyl ether sulfate, sulfosuccinate, phosphate ester type, Alkyl benzene sulfonate and naphthalene sulfonic acid formalin condensate can be used. In the nonionic system, polyoxyethylene alkyl ether type, polyoxyethylene fatty acid ester type, polyoxyethylene sorbitan fatty acid ester type, and polyoxyethylene polyoxypropylene alkyl ether type can be used.

The addition amount of the surfactant is anionic, nonionic separately or in two or more thereof, and added pressure to the surfactant 0.5 to 10 parts.

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. Example 2 is a reference example.
Example 1
[Production of granules]
First, powdered cyananadine 5.0 parts, bentonite-Na 30 parts, Katsumiyama clay 62 parts, sodium tripolyphosphate 1.0 part, activator Solpol 5060 (sulfonate type / phosphate combination product ) 0 parts were charged, and a table type double arm kneader (PNV-5 type: manufactured by Irie Shokai) was rotated at about 25-51 rpm / minute to thoroughly mix the powder, and then the liquid activator Peganol TH-6 (POE tridecyl ether: manufactured by Toho Chemical Co., Ltd.) 1.0 part, 10-20% of water as a water content was added and kneaded sufficiently. When it became a moist dumpling, it was taken out from the kneader and set to a dome gran DG-L1 type (manufactured by Fuji Powder Co., Ltd.) with a dome die screen diameter of 0.8 mm and extruded and granulated. The granulated wet granule is spread on a vat and naturally dried for 10 to 60 minutes, and then the granulated granule is sized and dried for 3 hours at 70 ° C or less using a circulating thermostatic dryer. did. After drying, a sieve shaker 300-MM2 type (manufactured by Tsutsui Rikagaku Co., Ltd.) is placed on a 1000-micron, 500-micron tray, and shaken to give a lump of 1000 to 500 microns. Foreign matter and powder were removed to obtain a cyanazine 5% granule with a yield of 95%.

[ Drug injury test of triazine herbicides against Pleurotus edulis]
In Ibaraki Prefecture, a 1m x 1m section was prepared in the Koraishiba field, which is being managed for customary growth in June, and seedlings were seeded in the section.
Examples 1, 2, and with 3 of Shianaji emissions made agents, crabgrass early June grown to 2 leaf was uniformly sprayed a predetermined application rate in the compartment.
As a comparative agent, a commercially available cyananadine wettable powder (trade name: Gramex wettable powder) was diluted with 200 ml of tap water sprayed per square meter and sprayed uniformly in the compartment with an electric sprayer.
11, 20, and 38 days after the drug treatment, the degree of phytotoxicity against cucumber shiba and the herbicidal effect against barnyard grass was observed and investigated to examine the effectiveness of this drug. At the same time, we investigated the degree of herbicidal effect on the broadleaf weed, Konishisou.
The results are as shown in Table-1.

[ Pharmacotoxicity test against Noshiba]
In Ibaraki Prefecture, a 1m x 1m plot was made in a Noshiba field, which is undergoing customary growth management in June, and barnyard grass was seeded in the plot.
Examples 1, 2, and with 3 of Shianaji emissions made agents, crabgrass was uniformly sprayed a predetermined application rate in the compartment in early June grown to 2 leaf.
As a comparative agent, a commercially available cyananadine wettable powder (trade name: Gramex wettable powder) was diluted with 200 ml of tap water sprayed per square meter and sprayed uniformly in the compartment with an electric sprayer.
11, 20, and 38 days after the drug treatment, the degree of phytotoxicity to horned buckwheat and the level of herbicidal effect on bark beetle were observed and investigated, and the efficacy of this drug was investigated. At the same time, we investigated the degree of herbicidal effect on the broadleaf weed, Konishisou.
The results are as shown in Table-2.

According to the present invention, even if a monochlorotriazine-based herbicide using cyananadine, which is an active ingredient having no physiological selectivity for Japanese turf, has a particle size of 0.5 to 1. by spraying into the grass as a 0mm granules, compared to wettable powder or sol agents injury can reduce the relative Japanese lawn, it has excellent safety to the Japanese lawn, generated in the turf High herbicidal effect on annual weeds and annual broadleaf weeds.

Claims (2)

  A herbicide for lawn which contains cyanazine as an active ingredient and has a form of granules having a particle size of 0.5 to 1.0 mm.   The lawn herbicide according to claim 1, wherein the content of cyanazine in the lawn herbicide is 0.1% to 10%.