JP2016216450A - Pollen inhibitor and pollen inhibition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical and practical pollen inhibitor capable of suppressing the formation of the pollen of plants such as cedar and cypress to prevent scattering and not exerting adverse effect on the plants, and to provide a pollen inhibition method using the pollen inhibitor.SOLUTION: Provided is a pollen inhibitor containing an acetolactic acid synthesis enzyme inhibitor, and a pollen inhibition method using the pollen inhibitor.SELECTED DRAWING: None

Description

  The present invention relates to a pollen formation inhibitor that suppresses the formation of pollen of plants such as cedar and cypress that cause hay fever, and a method for suppressing pollen formation using the pollen formation inhibitor.

  Pollen disease caused by cedar pollen and cypress pollen occurs from February to May in early spring and is one of the representative allergic diseases in Japan. The incidence of hay fever is increasing year by year and is a major problem. At present, cedar varieties with less pollen formation have been developed as countermeasures against hay fever, and some of them have been replanted. However, it is calculated that it takes more than 100 years to replant all cedars, so it is not realistic as an immediate measure.

So far, various studies have been conducted for the purpose of suppressing the formation and prevention of scattering of cedar pollen and cypress pollen. For example, vegetable oils such as oleic acid or linoleic acid (Patent Document 1) and polyhydric alcohols of fatty acids. There has been reported a method in which an ester (see Patent Document 2) is used as a pollen scattering inhibitor and the pollen scattering inhibitor is sprayed. However, in the methods of Patent Documents 1 and 2, the pollen scattering inhibitor must be sprayed, and it may be difficult to spray depending on the size of the target plant and the habitat environment. Furthermore, there is a possibility that other plants existing in the target area may be affected by the application of the pollen scattering inhibitor.
Patent Document 3 discloses a method for killing male flowers using a pollen scattering inhibitor containing cedar male flower parasitic fungi. However, the method of Patent Document 3 has a high manufacturing cost, and its effect is influenced by weather conditions and environmental conditions, so that it has not been put into practical use.

  By the way, an acetolactate synthase inhibitor such as imazamox has been conventionally used as an active ingredient of herbicides such as weeds (see Patent Document 4). However, it has not been known whether an acetolactate synthase inhibitor has a pollen formation inhibitory effect on plants such as cedar and cypress.

JP-A-5-238902 JP 2012-92174 A JP 2011-52039 A Special table 2003-528117

  The problem to be solved by the present invention is to prevent pollen formation by suppressing the formation of pollen of plants such as cedar and cypress, and to have an adverse effect on the plant, and more economical and practical pollen. It is to provide a formation inhibitor. Another object of the present invention is to provide a method for inhibiting pollen formation using the pollen formation inhibitor.

  In order to solve the above-mentioned problems, the inventors have conducted intensive studies. It was found that it can be suppressed.

That is, the present invention has the following contents.
1. A pollen formation inhibitor comprising an acetolactate synthase inhibitor.

Preferred embodiments of the pollen formation inhibitor of the present invention are as follows.
2. 2. The pollen formation inhibitor as described in 1 above, comprising an acetolactate synthase inhibitor as an active ingredient.

3. 3. The pollen formation inhibitor according to 1 or 2 above, which contains imazamox, imazapic, imazapill, or imazaquin as the acetolactate synthase inhibitor.

4). 4. The pollen formation inhibitor according to any one of 1 to 3, wherein imazamox or imazapic is included as the acetolactate synthase inhibitor.

5. 5. The pollen formation inhibitor according to any one of 1 to 4 above, which suppresses the formation of cedar pollen or cypress pollen.

Moreover, according to this invention, the pollen formation suppression method comprised by the following content is provided.
6). The pollen formation suppression method using the pollen formation inhibitor in any one of said 1-5.

Preferred embodiments of the pollen formation suppressing method of the present invention are as follows.
7). 7. The method for inhibiting pollen formation according to 6 above, wherein the pollen formation inhibitor is supplied to the inside of a cedar tree trunk or a hinoki tree trunk.

8). 7. The method for inhibiting pollen formation according to 6 above, wherein the pollen formation inhibitor is applied to a cedar tree trunk or a hinoki tree trunk.

9. 7. The method for inhibiting pollen formation according to 6 above, wherein the pollen formation inhibitor is sprayed on cedar branches and cypress branches and leaves.

10. 7. The method for inhibiting pollen formation according to 6 above, wherein the pollen formation inhibitor is sprayed or irrigated on soil in which cedar roots or cypress roots are distributed.

11. 8. The pollen formation inhibitor is supplied into the trunk of a cedar or cypress so that the amount of an acetolactate synthase inhibitor per tree is 0.05 μg to 2000 mg. Pollen formation inhibitor.

12 The amount of an acetolactate synthase inhibitor per tree with a height of 20 m or more is 1 mg to 20
12. The pollen formation inhibitor as described in 11 above, wherein the pollen formation inhibitor is supplied to the inside of a cedar or cypress tree trunk so as to be 00 mg.

13. 9. The pollen according to 8 above, wherein the pollen formation inhibitor is applied to a cedar or cypress tree trunk so that the amount of an acetolactate synthase inhibitor per tree is 2 μg to 5000 mg. Formation inhibitor.

14 The amount of acetolactate synthase inhibitor per tree with a height of 20 m or more is 2 mg to 50
14. The pollen formation inhibitor as described in 13 above, wherein the pollen formation inhibitor is applied to a tree trunk of cedar or cypress so as to be 00 mg.

15. The pollen formation according to 9 above, wherein the pollen formation inhibitor is sprayed on a cedar or cypress forest so that the amount of an acetolactate synthase inhibitor per 1 ha of the forest is 10 g to 500 g. Inhibitor.

16. The pollen formation inhibitor is sprayed or irrigated on the soil where cedar or cypress roots are distributed so that the amount of acetolactate synthase inhibitor per forest ha is 100 to 5000 g. The pollen formation inhibitor as described in 10 above.

  The present invention has an important feature in that an acetolactate synthase inhibitor is used. About an acetolactate synthase inhibitor, for example, as disclosed in Patent Document 4, it is known that it can function as a herbicide because it can weaken weeds and thereby suppress weeding of weeds. It was. However, surprisingly, according to the study by the present inventors, this acetolactate synthase inhibitor can prevent pollen scattering by suppressing the formation of pollen of plants such as cedar and cypress, Moreover, it was found that the plant itself does not wither. That is, according to the present invention, pollen formation can be selectively suppressed without impairing the growth state of plants such as cedar and cypress. Furthermore, in the present invention, other means can be adopted as well as spraying, the production cost is low, and the pollen formation preventing effect is stably exhibited, which is excellent in terms of economy and practicality. . In addition, in particular, when a means for supplying a pollen formation inhibitor to the inside of a tree trunk is adopted, the pollen formation inhibitor can be given only to the target plant to minimize the influence on the surrounding environment.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, this invention is not limited to the following embodiment, It can implement by changing variously within the range of the summary.

<Pollen formation inhibitor>
The pollen formation inhibitor of the present invention contains an acetolactate synthase inhibitor. An acetolactate synthase inhibitor has an activity to stop plant growth by inhibiting acetolactate synthase involved in amino acid biosynthesis. In the present invention, any known inhibitor can be used as long as it has such activity. Specifically, sulfonylurea compounds such as bensulfuron methyl, azimusulfuron, ethoxysulfuron, pyrazosulfuron ethyl, imazosulfuron ethyl, cyclosulfamuron; imazamox {for example, represented by the following formula (1)}, imazapic { For example, represented by the following formula (2)}, imazapyr {for example, represented by the following formula (3)}, imazametabenzmethyl, imazaquin {for example, represented by the following formula (4)}, imidazo such as imazetapill Linon-based compounds; pyrimidyloxybenzoic acid-based compounds such as pyriminobac-methyl, bispyribac-sodium salt, penoxsulam, and florathram; and the like can be used. These can be used alone or in combination of two or more.

(1)
(2)
(3)
(4)

  The acetolactate synthase inhibitor is preferably an imidazolinone compound, more preferably imazamox, imazapic, imazapill, or imazaquin, particularly preferably imazamox or imazapic. In this specification, imazamox, imazapic, imazapill and imazaquin include salts such as ammonium salts and amine salts, and structural isomers.

  By containing the acetolactate synthase inhibitor, the pollen formation inhibitor according to the present invention can suppress flowering of male flowers and suppress the formation of plant pollen. The type of plant is not particularly limited as long as it is a plant that forms pollen, and specifically, cypress family such as cedar, cypress, and mouse; Gramineae, such as genus, sparrows, camodia, sparrows, and other species; Asaidae, such as canamgras; Rosaceae such as pears and cherry; Taceae; Pinaceae such as red pine and black pine; Nettles; Elmaceae such as zelkova; Walnuts; Ginkgoceae; Legumes; Willowaceae; Plants such as Brassicaceae; Brassicaceae; Citrus; Lily; Ceratoceae; Oleaceae; Yew; And the like. As a plant to which the present invention is applied, from the viewpoint of maximizing the effects of the present invention, a plant having an airborne flower (flower that pollen moves and pollinates mediated by wind), such as cypress, mugwort, Ragweed, gramineous, beech, birch, pine, pine, ginkgo, nettle, elm, walnut, solanaceae, cypress are preferred, cypress are more preferred, and cedar or cypress are particularly preferred.

  The pollen formation inhibitor according to the present invention is usually used in the form of a solid preparation, a liquid preparation, or a semi-solid preparation.

  In the present invention, the acetolactate synthase inhibitor is preferably contained as an active ingredient, that is, the inhibitor is preferably contained in an amount capable of functioning effectively. Specifically, the lower limit of the content is preferably 0.1% by weight with respect to the total amount of the pollen formation inhibitor. More preferably, the lower limit in the case of a solid preparation is 5% by weight, and the lower limit in the case of a liquid preparation or a semi-solid preparation is 0.1% by weight, particularly 0.3% by weight. On the other hand, from the viewpoint of avoiding phytotoxicity, the upper limit of the content of the acetolactate synthase inhibitor is preferably 80% by weight with respect to the total amount of the pollen formation inhibitor. More preferably, the upper limit in the case of a solid preparation is 80% by weight, and the upper limit in the case of a liquid preparation or a semi-solid preparation is 50% by weight, in particular 20% by weight.

  Examples of solid preparations include granules (average particle size: 710 μm or more), powders (average particle size: 45 μm or less), powders (average particle size: 45 to 710 μm), wettable powder, aqueous solvent, tablets, and the like. Can be given.

  Examples of liquid preparations include liquid agents, emulsions, flowable (sol) agents, emulsion agents, and oil agents.

  Examples of semisolid preparations include pastes and gels.

  The pollen formation inhibitor of this invention can be manufactured using a well-known method. For example, it is produced by appropriately selecting and mixing an acetolactate synthase inhibitor, a carrier such as a solid carrier or a liquid carrier, and a surfactant or other auxiliary agent.

  Examples of solid carriers include natural materials such as kaolin clay, silica clay, wax stone clay, bentonite, acid clay, talc, diatomaceous earth, zeolite (zeolite), silicon oxide, silicate, carbonate, sulfate, and other various salts. Alternatively, fine powder or granular materials of synthetic minerals can be used. These can be used alone or in combination of two or more. As the solid carrier, a previously pulverized one may be used.

  Examples of the liquid carrier include water; hydrocarbons such as aliphatic hydrocarbons, aromatic hydrocarbons, kerosene and machine oil; alcohols; ketones such as cyclohexanone; esters such as fatty acid methyl esters; coconut oil, Vegetable oils such as soybean oil and rapeseed oil; organic solvents such as dimethyl sulfoxide and acetonitrile; These can be used alone or in combination of two or more. As the liquid carrier, water is preferably used in consideration of the influence on the environment. Further, the liquid carrier may be used by mixing the solid carrier.

  Examples of the surfactant include anionic surfactants such as dialkyl sulfosuccinate salts, alkylaryl sulfonate salts, polyoxyethylene alkyl ether phosphate salts; alkyl glucosides, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, Nonionic surfactants such as sorbitan fatty acid esters; cationic surfactants such as polyoxyethylene alkylmethylammonium salts and alkylamidoamine salts; and the like. These can be used alone or in combination of two or more.

  Other adjuvants include, for example, a grinding aid, a powdering aid, a binding aid, a slip aid, an emulsifier, a thickener, a pH adjuster, a coating aid, an antifoaming agent, a dissolution aid or Suspension and dispersion aids are listed, and specific examples include sugars, lignin sulfonates, alginates and other salts, polyvinyl alcohol, carboxymethyl cellulose, stearic acid, gum arabic, organic bentonite, phenylxylylethane, and polyethylene. Examples include glycol, vinyl acetate, and petroleum jelly. These can be used alone or in combination of two or more.

  More specifically, when the form of the pollen formation inhibitor of the present invention is a solid preparation, for example, an acetolactate synthase inhibitor and a pulverized solid carrier And, if necessary, an auxiliary agent can be mixed using a stirrer, and the acetolactate synthase inhibitor can be adsorbed on the surface of the solid support. Also, it is manufactured by mixing an acetolactate synthase inhibitor, a solid carrier, a liquid carrier, a surfactant, and an auxiliary agent such as a binding aid, and then shaping, drying and granulating the mixture. You can also.

  When the form of the pollen formation inhibitor of the present invention is a liquid preparation, it can be produced, for example, by mixing an acetolactate synthase inhibitor and a surfactant in a liquid carrier.

  When the form of the pollen formation inhibitor of the present invention is a semi-solid preparation, for example, a liquid preparation is prepared by the above-mentioned method, and then the obtained liquid preparation and the above-mentioned coating agent auxiliary agent such as organic bentonite And can be mixed.

  In any of the above production methods, as a device used for operations such as mixing, for example, a known device suitable for each step such as pulverization, classification, kneading, stirring, and granulation can be used.

  The formulation form of the pollen formation inhibitor according to the present invention can be appropriately selected according to the treatment method described later.

<Pollen formation suppression method>
The pollen formation suppression method using the pollen formation inhibitor according to the present invention (hereinafter sometimes referred to as the pollen formation suppression method of the present invention) will be specifically described. Specific examples of the treatment method in the pollen formation suppressing method of the present invention include the following.
(1) Method of supplying pollen formation inhibitor directly into the trunk (trunk internal supply)
(2) Method of applying pollen formation inhibitor to tree trunk (tree trunk application)
(3) Method of spraying pollen formation inhibitor on plants (spraying)
(4) Method of spraying or irrigating pollen formation inhibitor on soil where roots are distributed (soil treatment)

(1) Internal trunk supply In the case of internal trunk supply, the pollen formation inhibitor is preferably a liquid preparation or a semi-solid preparation, and more preferably a liquid preparation. As a specific treatment method, for example, there is a method of making a hole in a trunk before forming pollen, and injecting a pollen formation inhibitor from the hole using an injector such as a dropper, pipette or syringe. Further, instead of supplying by an injector, a nail in which a pollen formation inhibitor-containing liquid is soaked at the tip or a pin to which a capsule containing the liquid is attached may be inserted into the hole. Although the pollen formation inhibitor may be used as it is, the pollen formation inhibitor is diluted or dissolved in advance to an appropriate concentration using a liquid carrier, and the obtained diluted solution or solution is put into an injector. Also good.

  The amount of the acetolactate synthase inhibitor required for the internal supply of the trunk is determined in consideration of the tree height and the like. For example, in the case of cedar or cypress, 0.05 μg to 2000 mg, more preferably 1 μg to 1 tree. What is necessary is just to determine a supply amount in consideration of tree height etc. out of the range of 2000 mg, particularly preferably 5 μg to 1000 mg. Specifically, for example, in the case of cedar or cypress having a tree height of about 2 m, 1 to 2000 μg is preferable, and 5 to 1000 μg is more preferable per tree. For example, in the case of cedar or cypress having a tree height of 20 m or more, 1 to 2000 mg is preferable per tree, and 5 to 1000 mg is more preferable.

(2) Tree application In the case of tree application, the pollen formation inhibitor is preferably a liquid preparation or a semisolid preparation, and more preferably a semisolid preparation. As a specific treatment method, for example, a method of peeling a bark outside the trunk and applying a pollen formation inhibitor can be mentioned. The pollen formation inhibitor may be applied as it is, but may be diluted or dissolved in advance using a liquid carrier, and the resulting diluted solution or solution may be applied.

  The amount of the acetolactate synthase inhibitor required for tree application is determined in consideration of tree height and the like. For example, in the case of cedar or cypress, the range is preferably 2 μg to 5000 mg, more preferably 10 μg to 3000 mg per tree. What is necessary is just to determine supply amount considering tree height etc. from among. Specifically, for example, in the case of cedar or cypress having a tree height of about 2 m, the amount is preferably 2 to 5000 μg, more preferably 10 to 3000 μg per tree. For example, in the case of cedar or cypress having a tree height of 20 m or more, 2 to 5000 mg is preferable per tree, and 10 to 3000 mg is more preferable.

(3) Application In the case of application, the pollen formation inhibitor is preferably a liquid preparation or a solid preparation, and more preferably a liquid preparation. Specific treatment methods include, for example, a human-powered or powered sprayer or spreader such as a spray, shower, sprinkler, mist machine, etc., and a pollen formation inhibitor is added to branches, stems, stems, flowers, etc. The method of spraying on the plant surface. From the viewpoint that the active ingredient is efficiently absorbed, it is preferably applied to the branches and leaves. The pollen formation inhibitor may be sprayed as it is, but it may be diluted, dissolved or dispersed in advance using a liquid carrier, and the resulting diluted solution, solution or dispersion may be sprayed.

  The amount of the acetolactate synthase inhibitor required for the spraying treatment is, for example, preferably 10 to 500 g per 1 ha of cedar or cypress forest, and more preferably 25 to 250 g.

(4) Soil treatment In the case of soil treatment, the pollen formation inhibitor is preferably a liquid preparation or a solid preparation. Specific treatment methods include, for example, a method of spraying or irrigating a pollen formation inhibitor on soil where plant roots are distributed using an apparatus such as a sprayer, a spreader or an irrigator. Examples of the sprayer and the spreader include the same devices as those described in (3) Spreading process. Although the pollen formation inhibitor may be used as it is, it is diluted, dissolved or dispersed in advance using a liquid carrier, and the resulting diluted solution, dissolved solution or dispersion is used as a sprayer, spreader or irrigator. It may be put into equipment and used.

  In the present specification, “spreading” means that a liquid or solid pollen formation inhibitor is dispersed in an application target (plant, soil, etc.) of the pollen formation inhibitor. In addition, “irrigation” means pouring a liquid pollen formation inhibitor into the application target.

  The amount of the acetolactate synthase inhibitor required for soil treatment is, for example, preferably 100 to 5000 g, more preferably 250 to 2500 g per cedar or cypress forest.

  The application time of the pollen formation suppressing method of the present invention is appropriately determined according to the treatment method, the type of target plant, the treatment target area, and the like, but generally it is preferably up to June.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to a following example.

<Formulation Example 1: Preparation of imazamox solution>
Imazamox solution was prepared by blending imazamox ammonium salt (imazamox) as an active ingredient, polyoxyethylene alkyl ether as a surfactant, and water as a liquid carrier in the composition shown in Table 1.

<Formulation Example 2: Preparation of imazapic solution>
An imazapic solution was prepared by blending imazapic ammonium salt (imazapic) as an active ingredient, polyoxyethylene alkyl ether as a surfactant, and water as a liquid carrier in the composition shown in Table 2.

<Formulation Example 3: Preparation of imazamox solution>
Imazamox solution was prepared by blending imazamox ammonium salt (imazamox) as an active ingredient, polyoxyethylene alkyl ether as a surfactant and water as a liquid carrier in the composition shown in Table 3.

<Example 1: Pot test>
In a glass greenhouse, a cedar seedling with a tree height of about 0.6 m planted in a pot is used as a test plant, and a hole (diameter: about 1 mm, depth) is drilled in a trunk (about 10 mm in diameter) about 50 mm from the ground. Two pieces of about 5 mm) were opened. The imazamox solution of Formulation Example 1 and the imazapic solution of Formulation Example 2 were each diluted with water so that the drug concentration of the active ingredient was 5 ppm, 15 ppm, 50 ppm, 150 ppm or 500 ppm to prepare a total of 10 types of solutions. did. Three cedar seedlings were prepared for each of the prepared solutions, and 10 μL of these solutions were each injected into the holes of three seedlings. In July, about 3 months after injection, a 100 ppm gibberellin aqueous solution was sprayed on the entire leaf surface of a cedar seedling to induce male flower formation (about 30 mL / line). Six months after the gibberellin application, the degree of flowering and phytotoxicity of male flowers was investigated for each cedar seedling.

  The degree of flowering of male flowers was determined by observing each cedar seedling with the naked eye. Specifically, the presence or absence of male flowers in each branch of the seedling was determined, and the ratio (%) of the number of flowering branches to the total number of branches of one cedar seedling was calculated as [Flowering index]. Table 4 shows the average value of the flowering index (%) obtained for each of the seedlings.

The degree of phytotoxicity was determined by observing the branches and leaves of each cedar seedling with the naked eye. Specifically, the degree of branch leaf discoloration and leaf withering was compared with the cedar seedlings that were not treated with the pollen formation inhibitor, and was expressed as the [phytotoxicity index] of 0 to 5 below. Table 4 shows the average value of the phytotoxicity index obtained for each seedling.
[Drug Hazard Index]
0: No chemical damage 1: Slightly discolored (withered less than 5%)
2: Partial discoloration (5% to 20% withering)
3: Many discoloration and leaf withering (20% or more and less than 50% withering)
4: Many discoloration and leaf wilt but not dead (50% or more and less than 90% withered)
5: Withering (90% or more withering)

  As shown in Table 4, it was found that the pollen formation inhibitor of the present invention containing imazamox or imazapic has an effect of suppressing the generation of pollen by suppressing the flowering of male flowers of cedar. Moreover, it turned out that the pollen formation inhibitor of this invention has little phytotoxicity with respect to a cedar.

<Example 2: Field test>
In a field in Shimotsuma City, Ibaraki Prefecture, a 5-year-old cedar tree with a height of about 2m was used as a test tree, and it was placed in two to three places on the trunk (trunk diameter of about 80mm) 0.3 to 0.5m from the ground. A hole (diameter: about 6 mm, depth: about 20 mm) was made with a cone. The imazamox solution of Formulation Example 1 was diluted with water so that the drug concentrations of the active ingredients were 5.7 ppm, 57 ppm, and 570 ppm, respectively, to prepare three types of solutions. In addition, the imazapic solution of Formulation Example 2 was diluted with water so that the active ingredient drug concentrations were 17.1 ppm, 57 ppm, and 171 ppm, respectively, to prepare three types of solutions. 1 mL of each of these solutions was injected into 5 test trees. In July, one month after the injection, a 100 ppm gibberellin aqueous solution was sprayed over the cedar leaf surface (100 to 200 mL / line) to induce male flower formation. Table 5 shows the results of investigating the flowering index and phytotoxicity index of male flowers by the same method as in Example 1 six months after the gibberellin application.

  As shown in Table 5, it was found that the pollen formation inhibitor of the present invention containing imazamox or imazapic has an effect of suppressing the generation of pollen by suppressing the flowering of male flowers of cedar. Moreover, it turned out that the pollen formation inhibitor of this invention has little phytotoxicity with respect to a cedar.

<Example 3: Field test>
In May, in a cedar forest in Iga City, Mie Prefecture, a cedar tree with a height of 20 ± 5 m (average of about 20 m) was used as a test tree, and a tree trunk with a height of 0.3 to 0.5 m from the ground (average trunk diameter of about 280 mm (200 to 500 mm)), a hole (diameter of about 6 mm, depth of about 60 mm) was drilled with a cone. Formula Imazamox solution of Example 3 was injected into 12 test trees of 1.4 mL, 2.8 mL, and 5.6 mL each per cedar. Table 6 shows the results of investigating the flowering index and phytotoxicity index of male flowers in March of the following year by the same method as in Example 1.

  As shown in Table 6, it was found that the pollen formation inhibitor of the present invention containing imazamox has an effect of suppressing the generation of pollen by suppressing the flowering of male flowers of cedar. Moreover, it turned out that the pollen formation inhibitor of this invention has little phytotoxicity with respect to a cedar.

  From the above results, it was found that the pollen formation inhibitor of the present invention containing an acetolactate synthase inhibitor can efficiently suppress pollen formation of plants such as cedar without causing phytotoxicity.

  By using the pollen formation inhibitor of the present invention, it becomes possible to suppress the formation of pollen of plants such as cedar or cypress, to prevent scattering, and to contribute to the prevention of hay fever, which is now a social problem. it can.

Claims (16)

  A pollen formation inhibitor comprising an acetolactate synthase inhibitor.   The pollen formation inhibitor according to claim 1, comprising an acetolactate synthase inhibitor as an active ingredient.   The pollen formation inhibitor according to claim 1, wherein the acetolactate synthase inhibitor includes imazamox, imazapic, imazapill, or imazaquin.   The pollen formation inhibitor according to any one of claims 1 to 3, comprising imazamox or imazapic as the acetolactate synthase inhibitor.   Pollen formation inhibitor as described in any one of Claims 1-4 which suppresses formation of a cedar pollen or a hinoki pollen.   The pollen formation suppression method using the pollen formation inhibitor as described in any one of Claims 1-5.   The method for inhibiting pollen formation according to claim 6, wherein the pollen formation inhibitor is supplied into a cedar tree trunk or a cypress tree trunk.   The method for inhibiting pollen formation according to claim 6, wherein the pollen formation inhibitor is applied to a cedar tree trunk or a hinoki tree trunk.   The method for inhibiting pollen formation according to claim 6, wherein the pollen formation inhibitor is sprayed on cedar branches and cypress branches and leaves.   The method for inhibiting pollen formation according to claim 6, wherein the pollen formation inhibitor is sprayed or irrigated on soil in which cedar roots or cypress roots are distributed.   The pollen formation inhibitor is supplied into the trunk of a cedar or cypress tree so that the amount of an acetolactate synthase inhibitor per tree is 0.05 μg to 2000 mg. The pollen formation inhibitor described.   The pollen formation inhibitor is supplied into the trunk of a cedar or cypress so that the amount of an acetolactate synthase inhibitor per tree having a tree height of 20 m or more is 1 mg to 2000 mg. 11. Pollen formation inhibitor according to 11.   The pollen according to claim 8, wherein the pollen formation inhibitor is applied to the trunk of a cedar or cypress so that the amount of an acetolactate synthase inhibitor per tree is 2 µg to 5000 mg. Formation inhibitor.   The pollen formation inhibitor is applied to a cedar or cypress tree trunk so that the amount of an acetolactate synthase inhibitor per tree having a tree height of 20 m or more is 2 mg to 5000 mg. The pollen formation inhibitor described in 1.   The pollen formation according to claim 9, wherein the pollen formation inhibitor is sprayed on the branches and leaves of cedar or cypress so that the amount of the acetolactate synthase inhibitor per 1 ha of the forest is 10 g to 500 g. Inhibitor.   The pollen formation inhibitor is sprayed or irrigated on soil where cedar or cypress roots are distributed so that the amount of an acetolactate synthase inhibitor per 1 ha of forest is 100 g to 5000 g. The pollen formation inhibitor of Claim 10.