JP2002293706A - Agent for preventing purple blotch of lawn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agent for preventing purple blotch of lawn, capable of preventing the purple blotch generating on lawn, especially on bent green in a cold season from late autumn to winter and provide a method for preventing the purple blotch by using the purple blotch preventing agent. SOLUTION: The agent for preventing purple blotch of lawn contains a near ultraviolet absorbing agent absorbing near ultraviolet rays of 300-400 nm wavelength (excluding iron oxide and zinc oxide). The invention also provides a method for preventing the purple blotch of lawn by using the purple blotch preventing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an agent for preventing turf purpura and a method for preventing turf purpura using the turf purpura inhibitor. For details, from late autumn to winter, turf such as golf courses and parks,
In particular, the present invention relates to a turf purpura preventive agent for preventing the appearance of uneven purpura observed in bentgrass and a method for preventing turf purpura using the purpura inhibitor.

[0002]

2. Description of the Related Art Bent glasses used for golf course greens and the like produce so-called purple spots that become partially or entirely purple in color from late autumn to winter.
The problem is that the appearance is significantly impaired.

[0003] Bentgrass originally has a strain that expresses purpura (anthocyan dye) and a strain that does not express it. A strain that expresses purpura is called an anthocyan strain, and a strain that does not express purpura is called a non-anthocyan strain. Non-Anthocyan turf is being built. However, even in the case of using non-Anthocyan-type bentgrass, the golf course usually manages the green with overseed, so in a few years, the anthocyanin type often comes out due to genetic factors, and the problem has not been solved .

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to prevent the occurrence of purple spots, which appear in turf, especially bent green, in the low-temperature season from late autumn to winter without inhibiting the growth of turf. And a method for preventing turf purpura using the purpura inhibitor.

[0005]

Means for Solving the Problems The present inventors have conducted various studies in order to solve the problems. As a result, the purple spots of the turf that occur from late autumn to winter, in particular, are exposed to sunlight during the period when the metabolic function of the turf decreases. To prevent tissue damage caused by ultraviolet rays,
We found that turf is caused by producing anthocyan pigments. In order to prevent the occurrence of purple spots, a method of covering the grass surface with a nonwoven fabric or a near-ultraviolet-cut vinyl sheet is conceivable, but it is impossible to cover the green fabric of a golf course with a nonwoven fabric or vinyl sheet during the day due to play. is there.

On the other hand, in order to impart light resistance and weather resistance to industrial plastics, resins, films, paints, and the like,
Iron oxide (Fe ₂ O ₃ ), zinc oxide, cerium oxide, and various ultraviolet absorbers are used as additives. Therefore, we considered spraying these UV absorbers on turf.For example, when spraying inexpensive iron oxide on turf,
It was found that the phytotoxicity to turf was great, and that all of these ultraviolet absorbers could not always be used.

[0007] In view of these, the present inventors have conducted various studies, and as a result, some of these ultraviolet absorbers have excellent near-ultraviolet absorption and blocking properties, and have little phytotoxicity to turf. It has been found that the purpuration phenomenon can be effectively prevented, and some of them surprisingly have an effect of promoting the growth of the turf rather than inhibiting the growth of the turf, and have completed the present invention.

That is, the present invention provides a turf purpura inhibitor comprising a near-ultraviolet absorber (excluding iron oxide and zinc oxide) that absorbs near-ultraviolet light having a wavelength of 300 to 400 nm. .

The present invention also provides a method for preventing purple spots on turf, which comprises spraying near-ultraviolet absorbers (excluding iron oxide and zinc oxide) for absorbing near-ultraviolet light having a wavelength of 300 to 400 nm on turf. provide.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The near-ultraviolet absorber having a wavelength of 300 to 400 nm which can be used for the turf purpura inhibitor of the present invention preferably has little phytotoxicity to turf, except for iron oxide and zinc oxide. Benzotriazole UV absorber, triazine UV absorber, benzophenone UV absorber,
Examples thereof include a salicylate-based ultraviolet absorber, a cyanoacrylate-based ultraviolet absorber, an oxalic amide-based ultraviolet absorber, and titanium oxide having an average particle diameter of 0.01 to 0.1 μm.

For example, as a benzotriazole type ultraviolet absorber, 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy- 5'-t-octylphenyl) benzotriazole, 2- (2'-hydroxy-
3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5 '
-T-butylphenyl) benzotriazole, 2-
(2'-hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole, 2- (2'-hydroxy-
3′-t-butyl-5′-methylphenyl) benzotriazole,

2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) benzotriazole;
(2'-hydroxy-4'-octoxyphenyl) benzotriazole, 2- (2'-hydroxy-3'-
(3,4,5,6-tetrahydrophthalimidomethyl)
-5'-methylphenyl) benzotriazole, 2-
(2′-hydroxy-3 ′, 5′-dinonylphenyl)
Benzotriazole, iso-octyl-3- (3- (benzotriazol-2-yl) -5-t-butyl-4-
Hydroxyphenyl propionate,

2- (2'-hydroxy-3 ', 5'-di (1,1-dimethylbenzyl) phenyl) benzotriazole, 2- (2'-hydroxy-3'-dimethylbenzyl-5'-(1 , 1,3,3-tetramethylbutyl)
Phenyl) benzotriazole, methyl-3- [3-t
-Butyl-5- (2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate, isooctyl-3- (3 (2H-benzotriazole-2-
Yl) -5-t-butyl-4-hydroxyphenylpropionate and the like.

The triazine-based UV absorbers include 2-
[4-[(2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- (4 , 6-Diphenyl-1,3,5-trizin-2-yl) -5 [(hexyl) oxy] -phenol.

As the benzophenone-based ultraviolet absorber,
2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2,4
-Dihydroxybenzophenone, 2-hydroxy-4-
Dodecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-methoxybenzophenone, 2, -hydroxy-4-methoxy-5-sulfobenzophenone, and the like.

Examples of the salicylate-based ultraviolet absorber include phenyl salicylate, 4-n-octylphenyl salicylate, 2-ethylhexyl salicylate, and homomesityl salicylate. Examples of the cyanoacrylate-based ultraviolet absorber include ethyl-2-cyano-3,3-diphenylacrylate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, and the like.

As the oxalic acid amide-based ultraviolet absorber,
2-ethyl-5'-t-butyl-2'-ethoxy-N,
N'-diphenyloxalamide, 2-ethyl-2'-ethoxy-N, N'-diphenyloxalamide, 4-dodecyl-2'-ethoxy-N, N'-diphenyloxalamide and the like No.

Further, the average particle diameter is 0.01 to 0.1 μm
Can also be cited as a near-ultraviolet absorber that absorbs near-ultraviolet light having a preferred wavelength of 300 to 400 nm. Titanium oxide having these average particle diameters is extremely fine particles, and is transparent and transmits light.
It seems to absorb or block near-ultraviolet light of 400 nm to some extent. One or more of these near-ultraviolet absorbers having a wavelength of 300 to 400 nm are appropriately mixed and used in the purpura inhibitor of the present invention.

The turf purpura inhibitor of the present invention may be optionally used
A coloring agent may be contained for the purpose of maintaining the natural color of the turf even if the purpuration inhibitor adheres. As the coloring agent,
Green to blue pigments or pigment dispersion compositions, for example, as the pigment, any of organic pigments such as phthalocyanine blue, phthalocyanine green, Hansa Yellow, imidazolone, lake red, and quinacridone can be used. As the composition, Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.), Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.), Ryudai W Black RC (manufactured by Dainippon Ink and Chemicals, Inc.), Liu Any pigment dispersion composition such as Daigreen F4G (manufactured by Dainippon Ink and Chemicals, Inc.) can be used, and a desired color can be adjusted by mixing one or two or more of these. Also,
Generally commercially available aqueous pigments can also be used.

Further, the turf purpura inhibitor of the present invention may contain a surfactant, if necessary. As the surfactant, a nonionic surfactant or an anionic surfactant is used. Nonionic surfactants include silicone surfactants, polyoxyethylene aryl phenyl ethers, polyoxyethylene / polyoxypropylene block polymers, sorbitan fatty acid esters, polyoxyethylene alkyl phenyl ethers, polyoxyethylene alkyl phenyl ether , Polyoxyethylene castor oil ethers, polyoxyethylene sorbitan esters, polyglycerin fatty acid esters, sorbitol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and the like. Among them, silicone surfactants It is preferably used.

Examples of the anionic surfactant include dialkyl sulfosuccinate surfactants, alkyl naphthalene sulfonate surfactants, alkyl naphthalene sulfonate surfactants, polyoxyethylene tristyryl phenyl ether sulfate, Polyoxyethylene tristyryl phenyl ether phosphate, polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene alkyl phenyl ether phosphate,
Alkyl benzene sulfonate surfactants and the like can be mentioned, and among them, dialkyl sulfosuccinate surfactants are preferably used. These surfactants can be used alone or in combination of two or more.

The turf purpura-preventing agent of the present invention may contain a fixing agent, if necessary. Examples of the fixing agent used in the present invention include a water-dispersible emulsion resin and a water-soluble resin which form a hydrophobic coating in a dry state.

More specifically, examples of the aqueous dispersion type emulsion resin include an ethylene-vinyl acetate copolymer resin emulsion, a vinyl acetate-veova copolymer resin emulsion, a vinyl acetate-acryl copolymer resin emulsion, and acetic acid. Vinyl resin emulsion, urethane-acryl copolymer resin emulsion, acrylic resin emulsion,
Styrene-acrylic copolymer resin emulsion, silicon-acrylic copolymer resin emulsion and the like can be mentioned.

More specifically, the water-dispersion type emulsion resin is, for example, Evadic EV-15 (ethylene-vinyl acetate copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.), trade name: Eva Dick EV-
2 (ethylene-vinyl acetate copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.), trade name: Boncoat 6620 (vinyl acetate-veova copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.),

Trade name: Boncoat 9160 (vinyl acetate-acryl copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.); trade name: Boncoat 2610S (vinyl acetate resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.); Name: Boncoat EC818 (acrylic resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.) Trade name: Boncoat EC863 (styrene-acrylic copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.), trade name: Boncoat U-40 ( Vova-acryl copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc., trade name: Boncoat CG-5010 (urethane-acryl copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.), trade name: Boncoat SA- 5100
(Silicone-acryl copolymer resin emulsion, manufactured by Dainippon Ink and Chemicals, Inc.).

Specific examples of the water-soluble resin include a water-soluble acrylic resin, a water-soluble alkyd resin, celluloses such as polyvinyl alcohol and carboxymethyl cellulose, and polysaccharides such as polyvinyl pyrrolidone and pullulan. Specifically, trade name: Watersol S753 (water-soluble acrylic resin, manufactured by Dainippon Ink and Chemicals, Inc.), trade name: Watersol S311
(A water-soluble alkyd resin, manufactured by Dainippon Ink and Chemicals, Inc.) and the like, and one or more of these fixing agents can be used in combination.

The turf purpura inhibitor of the present invention has a wavelength of 300 to
It is preferably an in-water dispersion-type preparation obtained by dispersing or dissolving a 400 nm near-ultraviolet absorber in an organic solvent or dispersing in water with a dispersant. In the case of dispersing in water, if the near ultraviolet absorber having a wavelength of 300 to 400 nm is already in a fine powder state of about 0.01 to 1.0 μm, it may be merely dispersed in water with a homogenizer or the like. In the case of performing dispersion or emulsification by dispersing in water, micronization or emulsification is performed using a homogenizer, a high-pressure emulsifier, an ultrasonic emulsifier, a wet pulverizer, or the like to prepare an in-water dispersion-type preparation. The coloring agent, the surfactant, the fixing agent, and the additive may be added at the time of preparing or preparing the dispersion in water.

Examples of the wet pulverizer include a method in which a mixed slurry is stirred at a high speed with fine spherical rigid beads (glass, ceramic, etc.) to pulverize the mixture. For example, Dynomill KDL type, WILLY A. BACHOFEN
AG Maschinenfabrik Basel
Manufactured by Ashizawa LMZ type, manufactured by Ashizawa Co., Ltd., sand grinder, manufactured by Imex Co., Ltd., and the like.

The turf purpura inhibitor of the present invention has a wavelength of 300 to 4
A near-ultraviolet absorber that absorbs near-ultraviolet light of 00 nm is an essential component, and the near-ultraviolet absorber, for example, having an average particle diameter of 0.1 nm.
It is a dispersion of titanium oxide of 01 to 0.1 μm in water, and the compounding ratio of the near-ultraviolet absorber is 20 to
It is 60% by weight, more preferably 30 to 50% by weight, and the mixing ratio of water and / or an organic solvent as another component is 40 to 80% by weight, more preferably 50 to 70% by weight.

It is preferable to further add a surfactant to the turf purpura inhibitor of the present invention in order to enhance the stability of the preparation. In the purpura inhibitor containing a surfactant, the blending ratio of the near-ultraviolet absorber is 20 to 60% by weight, more preferably 30 to 50% by weight, and the blending ratio of the surfactant is 1 to 10% by weight, more preferably 3-7% by weight
It is. The mixing ratio of water and / or an organic solvent as another component is 30 to 79% by weight, more preferably 4 to 79% by weight.
3 to 67% by weight.

Further, it is also preferable to add a coloring agent to the turf purpura inhibitor of the present invention in order to cover the discoloration of the turf due to the spraying agent and to keep the turf beautiful. For example, when a surfactant and a colorant are blended, the blending ratio of the near ultraviolet absorber is 10 to 40% by weight, more preferably 15 to 3% by weight in the purpura inhibitor.
At 5% by weight, the surfactant is 1-10% by weight, more preferably 3-7% by weight, and the colorant is 5-20% by weight, more preferably 10-15% by weight. In addition, water and / or an organic solvent as another component is 30 to 84% by weight, more preferably 43 to 72% by weight.

Further, it is also preferable to add a fixing agent to the turf purpura inhibitor of the present invention in order to efficiently attach the near-ultraviolet absorber to the turf. For example, when a surfactant, a colorant and a fixing agent are blended, the blending ratio of the near-ultraviolet absorber is 5 to 38% by weight, more preferably 7 in the purpura inhibitor.
%, The surfactant is 0.5-4% by weight, more preferably 1.5-3.5% by weight, and the colorant is 5-18%.
% By weight, more preferably 7.5 to 15% by weight, and the fixing agent is 0.05 to 33% by weight, more preferably 0.1 to 30% by weight.
% By weight. In addition, water and / or an organic solvent as other components is 7 to 89.45% by weight, more preferably 1 to 89.45% by weight.
5.5 to 83.9% by weight.

The compounding ratio described here is an example of a preferable compounding example, and the turf purpura-preventing agent of the present invention is not limited to, for example, a compound of a near-ultraviolet absorber, a surfactant and a fixing agent. It may be.

The type of turf to which the purpura inhibitor of the present invention is applied is not particularly limited as long as the turf causes purpuration.
Generally includes all turf used in golf courses, stadiums, gardens, etc., specifically, for example, red top, creeping bentgrass, velvet bentgrass, tall fescue, perennial ryegrass, Italian ryegrass, Kentucky bluegrass, Buffalo glass,
Bermudagrass, weeping lovegrass, nosyba,
Black rice, centipede glass, carpet glass,
Darisgrass, Kikuyugrass, St. Augustinegrass, etc. (all are common names) are mentioned.

The turf purpura preventive agent of the present invention prevents turf purpura, which could not be prevented without covering the turf with a nonwoven fabric or a near-ultraviolet-cut vinyl sheet, only by spraying in the form of a spray liquid. It is possible and labor-saving. At this time, the spray liquid is usually diluted 10 times to 100 times,
Sprinkled on the grass.

The method of spraying is not particularly limited, but it may be sprayed using a sprayer or the like usually used for pesticides. When spraying with a sprayer, etc., the amount of spray varies depending on the dilution ratio of the purpura inhibitor used, the content of the UV inhibitor in the preparation, etc. agent 0.01 to 20 g / ^{m 2,} preferably 0.05 to 10 g / ^{m 2,} more preferably 0.1
What is necessary is just to spray so that it may be set to ５5 g / m ² . For example, 1
10 times to 10 if it is filled in a ~ 40L container
It may be diluted to 0-fold, and about 1 container per 1000 m ² may be sprayed on the grass surface.

The time of application of the purpura inhibitor of the present invention is from autumn to winter. Spraying is performed 1 to 10 times, preferably 2 to 5 times at the time of spraying. Since the spraying interval varies depending on the number of sprayings, it cannot be specified uniformly.
It is carried out at intervals of between days and 50 days, preferably between 7 and 40 days.

The turf purpura inhibitor of the present invention sprays a diluting solution on a turf surface with a spraying device, so that the UV inhibitor adheres to the turf leaf surface, and provides a sufficient purpura-preventing effect. In addition, the turf purpura preventive agent of the present invention does not cause serious phytotoxicity even if it adheres to turf because the ultraviolet absorber has a low physiological activity on turf.

As described above, the turf purpura inhibitor of the present invention comprises:
(A) Even if the purpura-preventing agent adheres to turf, no phytotoxicity occurs,
(B) Prevention or suppression of turf purpura by spraying a purplish inhibitor to satisfactorily absorb or block the near-ultraviolet region having a wavelength of 300 to 400 nm poured onto turf leaves;
Even if it adheres to the turf, it retains the natural color of the turf and does not impair the beauty of the turf. (D) The adhesion to the turf is high, and the chemicals adhere evenly, effectively preventing purple spots on the turf. It is possible.

[0040]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples of the present invention, but the present invention is not limited to these ranges.

[Example 1] The primary particle size was 0.03 to 0.
40 parts by weight of 05 μm titanium oxide (trade name: ST-440, manufactured by Titanium Industry Co., Ltd.) is added to 54 parts by weight of water and alkyl naphthalene sulfonate condensate (trade name: SUPRA)
GIL MNS / 90, manufactured by Rhone Poulin Co., Ltd.) 6
Parts by weight are dispersed in the dissolved solution, and the mixture is dispersed at 10,000 rpm with a TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.).
The mixture was dispersed for 1 minute to obtain a purpura inhibitor.

[Example 2] The primary particle diameter was 0.03 to 0.
40 parts by weight of 05 μm titanium oxide (trade name: ST-495M, manufactured by Titanium Industry Co., Ltd.) is added to 54 parts by weight of water and alkyl naphthalene sulfonate condensate (trade name: SUPRA)
GIL MNS / 90, manufactured by Rhone Poulin Co., Ltd.) 6
Parts by weight are dispersed in the dissolved solution, and the mixture is dispersed at 10,000 rpm with a TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.).
The mixture was dispersed for 1 minute to obtain a purpura inhibitor.

Example 3 The primary particle size was 0.03 to 0.3.
40 parts by weight of 05 μm titanium oxide (trade name: ST-65C-S, manufactured by Titanium Industry Co., Ltd.) is added to 54 parts by weight of water and alkyl naphthalene sulfonate condensate (trade name: SUPR)
AGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd.)
6 parts by weight were dispersed in the dissolved solution, and the mixture was dispersed at 10,000 rpm with a TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.).
The mixture was dispersed for 1 minute to obtain a purpura inhibitor.

Example 4 58.58 parts by weight of water, 3.4 parts by weight of polyoxyethylene tristyryl phenyl ether sulfate (trade name: SORPOL 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl Ether (trade name: SOPROPHOR)
1.1 parts by weight of BSU, manufactured by Rhone Poulin Co., Ltd., alkylnaphthalene sulfonate condensate (trade name: SUP)
RAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd.) (1.1 parts by weight) and antifoaming agent SM5512 (Toray Dow Corning Silicone Co., Ltd.), 0.02 parts by weight, were mixed and dissolved in 2- (2′-hydroxy). -3 ',
5'-di-t-amylphenyl) benzotriazole 3
5.8 parts by weight were added and dispersed, and the mixture was pulverized with a wet pulverizer to obtain a purpuration inhibitor.

Example 5 58.58 parts by weight of water, 3.4 parts by weight of polyoxyethylene tristyryl phenyl ether sulfate (trade name: SORPOL 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl Ether (trade name: SOPROPHOR)
1.1 parts by weight of BSU, manufactured by Rhone Poulin Co., Ltd., alkylnaphthalene sulfonate condensate (trade name: SUP)
RAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd.) (1.1 parts by weight) and antifoaming agent SM5512 (Toray Dow Corning Silicone Co., Ltd.), 0.02 parts by weight, were mixed and dissolved in 2- (2′-hydroxy). -3'-t
-Butyl-5'-methylphenyl) -5-chlorobenzotriazole was added and dispersed, and the mixture was pulverized with a wet pulverizer to obtain a purpuration inhibitor.

Example 6 24.78 parts by weight of water, sodium dioctylsulfosuccinate (trade name: Airroll C)
T-1L, 2 parts by weight, manufactured by Toho Chemical Industry Co., Ltd., polyoxyethylene tristyryl phenyl ether (trade name:
0.6 parts by weight of SOPROPHOR BSU, manufactured by Rhone-Poulin Co., Ltd., 0.6 parts by weight of an alkyl naphthalene sulfonate condensate (trade name: SUPRAGIL MNS / 90, manufactured by Rhone-Poulenc Co., Ltd.), defoamer SM55
12 (Toray Dow Corning Silicone Co., Ltd.)
2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) was added to a solution obtained by mixing and dissolving 0.02 parts by weight.
7 parts by weight of -5-chlorobenzotriazole were added and dispersed, and this was pulverized by a wet pulverizer.

In the obtained dispersion solution, 4.8 parts by weight of ethylene glycol was used as an antifreezing agent, and Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.) 1 was used as a coloring agent.
2 parts by weight, 15 parts by weight of Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.) and 3 parts by weight of Ryudai W Black RC (manufactured by Dainippon Ink and Chemicals, Inc.)
30 parts by weight of Boncoat 6620 (manufactured by Dainippon Ink and Chemicals, Inc.) as a fixing agent and 0.2 parts by weight of Bestside 1000 (manufactured by Dainippon Ink and Chemicals, Inc.) as an antiseptic were added to obtain a purpuration inhibitor.

Example 7 47.78 parts by weight of water, 2 parts by weight of a silicon-based surfactant (trade name: Silwet L-77, manufactured by Nippon Unicar Co., Ltd.), polyoxyethylene tristyryl phenyl ether (trade name: SOPROPHOR B
SU, 0.6% by weight of Rhone-Poulenc Co., Ltd., alkyl naphthalene sulfonate condensate (trade name: SUPR)
AGILMNS / 90, manufactured by Rhone Poulin Co., Ltd.)
A solution prepared by mixing and dissolving 0.6 part by weight of an antifoaming agent SM5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.) in an amount of 0.02 part by weight was mixed with 2- (2′-hydroxy-3′-t-butyl-5′-). Methylphenyl) -5-chlorobenzotriazole (14 parts by weight) was added and dispersed, and this was pulverized by a wet pulverizer.

In the obtained dispersion solution, 4.8 parts by weight of ethylene glycol was used as an antifreezing agent, and Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.) 1 was used as a coloring agent.
2 parts by weight, 15 parts by weight of Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.) and 3 parts by weight of Ryudai W Black RC (manufactured by Dainippon Ink and Chemicals, Inc.)
0.2 parts by weight of Bestside 1000 (manufactured by Dainippon Ink and Chemicals, Inc.) was added as a preservative to obtain a purpuration inhibitor.

Example 8 33.78 parts by weight of water, sodium dioctylsulfosuccinate (trade name: Airroll C)
T-1L, 2 parts by weight, manufactured by Toho Chemical Industry Co., Ltd., polyoxyethylene tristyryl phenyl ether (trade name:
0.6 parts by weight of SOPROPHOR BSU, manufactured by Rhone-Poulin Co., Ltd., 0.6 parts by weight of an alkyl naphthalene sulfonate condensate (trade name: SUPRAGIL MNS / 90, manufactured by Rhone-Poulenc Co., Ltd.), defoamer SM55
12 (Toray Dow Corning Silicone Co., Ltd.)
2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) was added to a solution obtained by mixing and dissolving 0.02 parts by weight.
28 parts by weight of -5-chlorobenzotriazole were added and dispersed, and this was pulverized by a wet pulverizer.

In the obtained dispersion solution, 4.8 parts by weight of ethylene glycol was used as an antifreezing agent, and Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.) 1 was used as a coloring agent.
2 parts by weight, 15 parts by weight of Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.) and 3 parts by weight of Ryudai W Black RC (manufactured by Dainippon Ink and Chemicals, Inc.)
0.2 parts by weight of Bestside 1000 (manufactured by Dainippon Ink and Chemicals, Inc.) was added as a preservative to obtain a purpuration inhibitor.

Example 9 31.78 parts by weight of water, 4 parts by weight of a silicone surfactant (trade name: Silwet L-77, manufactured by Nippon Unicar Co., Ltd.), polyoxyethylene tristyryl phenyl ether (trade name: SOPROPHOR B
SU, 0.6% by weight of Rhone-Poulenc Co., Ltd., alkyl naphthalene sulfonate condensate (trade name: SUPR)
AGILMNS / 90, manufactured by Rhone Poulin Co., Ltd.)
A solution prepared by mixing and dissolving 0.6 part by weight of an antifoaming agent SM5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.) in an amount of 0.02 part by weight was mixed with 2- (2′-hydroxy-3′-t-butyl-5′-). (Methylphenyl) -5-chlorobenzotriazole (28 parts by weight) was added and dispersed, and the mixture was pulverized by a wet pulverizer.

In the obtained dispersion solution, 4.8 parts by weight of ethylene glycol was used as an antifreezing agent, and Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.) 1 was used as a coloring agent.
2 parts by weight, 15 parts by weight of Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.) and 3 parts by weight of Ryudai W Black RC (manufactured by Dainippon Ink and Chemicals, Inc.)
0.2 parts by weight of Bestside 1000 (manufactured by Dainippon Ink and Chemicals, Inc.) was added as a preservative to obtain a purpuration inhibitor.

Example 10 29.78 parts by weight of water, 6 parts by weight of sodium dioctylsulfosuccinate (trade name: AIROL CT-1L, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl ether (trade name: 0.6 parts by weight of SOPROPHOR BSU, manufactured by Rhone Poulin Co., Ltd., an alkyl naphthalene sulfonate condensate (trade name: SUPRAGIL MNS / 90,
0.6 parts by weight of Rhone Poulin Co., Ltd., defoamer SM
2- (2 ′) was added to a solution obtained by mixing and dissolving 0.02 parts by weight of 5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.).
-Hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole (28 parts by weight) was added and dispersed, and this was pulverized by a wet pulverizer.

In the obtained dispersion solution, 4.8 parts by weight of ethylene glycol was used as an antifreezing agent, and Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.) 1 was used as a coloring agent.
2 parts by weight, 15 parts by weight of Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.) and 3 parts by weight of Ryudai W Black RC (manufactured by Dainippon Ink and Chemicals, Inc.)
0.2 parts by weight of Bestside 1000 (manufactured by Dainippon Ink and Chemicals, Inc.) was added as a preservative to obtain a purpuration inhibitor.

Example 11 59.33 parts by weight of water, 3.4 parts by weight of polyoxyethylene distyryl phenyl ether polymer sulfate (trade name: Solpol 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl Phenyl ether (trade name: SOPROPHO)
R BSU, manufactured by Rhone Poulin Co., Ltd.) 1.1 parts by weight, polyvinylpyrrolidone (trade name: sokalan)
HP53, manufactured by BASF) 0.1 part by weight, defoamer SM5
512 (manufactured by Tore Dow Corning Silicone Co., Ltd.), 0.02 parts by weight, preservative (trade name: Best Side 1)
2,000, manufactured by Dainippon Ink and Chemicals, Inc.).
36 parts by weight of 3′-t-butyl-5′-methylphenyl) -5-chlorobenzotriazole was added and dispersed, and the mixture was pulverized with a wet pulverizer to obtain a purpuration inhibitor.

Example 12 30.53 parts by weight of water, 2.2 parts by weight of sodium dioctylsulfosuccinate (trade name: Airroll CT-1L, manufactured by Toho Chemical Industry Co., Ltd.)
1.1 parts by weight of polyoxyethylene tristyryl phenyl ether (trade name: SOPROPHOR BSU, manufactured by Rhone Poulin Co., Ltd.), polyvinylpyrrolidone (trade name: sokalan HP53, manufactured by BASF) 0.1
Parts by weight, 0.02 parts by weight of an antifoaming agent SM5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.) and 0.05 parts by weight of an antiseptic (trade name: Bestside 1000, manufactured by Dainippon Ink and Chemicals, Inc.) 2-
36 parts by weight of (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole was added and dispersed, and this was pulverized by a wet pulverizer.

In the obtained dispersion solution, as a coloring agent, 12 parts by weight of Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.), 15 parts by weight of Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.) and Ryudai W
3 parts by weight of Black RC (manufactured by Dainippon Ink and Chemicals, Inc.) were added to obtain a purpuration inhibitor.

Example 13 29.33 parts by weight of water, 3.4 parts by weight of polyoxyethylene distyryl phenyl ether polymer sulfate (trade name: Solpol 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl Phenyl ether (trade name: SOPROPHO)
R BSU, manufactured by Rhone Poulin Co., Ltd.) 1.1 parts by weight, polyvinylpyrrolidone (trade name: sokalan)
HP53, manufactured by BASF) 0.1 part by weight, defoamer SM5
512 (manufactured by Tore Dow Corning Silicone Co., Ltd.), 0.02 parts by weight, preservative (trade name: Best Side 1)
2,000, manufactured by Dainippon Ink and Chemicals, Inc.).
36 parts by weight of 3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole was added and dispersed, and this was pulverized by a wet pulverizer.

In the obtained dispersion solution, as a coloring agent, 12 parts by weight of Ryudai Green FBK (manufactured by Dainippon Ink and Chemicals, Inc.), 15 parts by weight of Ryudai Yellow KGL (manufactured by Dainippon Ink and Chemicals, Inc.) and Ryudai W
3 parts by weight of Black RC (manufactured by Dainippon Ink and Chemicals, Inc.) were added to obtain a purpuration inhibitor.

Example 14 50 parts by weight of the composition of the purpura inhibitor of Example 12 and a vinyl acetate resin emulsion (trade name: Evadic EV-15, manufactured by Dainippon Ink and Chemicals, Inc.) 50 as a fixing agent By adding parts by weight, a purpura inhibitor was obtained.

Example 15 25 parts by weight of the composition of the purpura inhibitor of Example 12 and 50 parts by weight of a vinyl acetate resin emulsion (trade name: Boncoat 6620, manufactured by Dainippon Ink and Chemicals, Inc.) as a fixing agent were used. In addition, a purpura inhibitor was obtained.

Example 16 58.58 parts by weight of water, 3.4 parts by weight of polyoxyethylene tristyryl phenyl ether sulfate (trade name: SORPOL 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl Ether (trade name: SOPROPHOR)
BSU, manufactured by Rhone Poulin Co., Ltd.) 1.1 parts by weight,
Alkyl naphthalene sulfonate condensate (Product name: SU
2- (4,6-) was prepared by mixing and dissolving 1.1 parts by weight of PRAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd. and 0.02 parts by weight of an antifoaming agent SM5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.). Diphenyl-1,
35.8 parts by weight of 3,5-trizin-2-yl) -5 [(hexyl) oxy] -phenol was added and dispersed, and the mixture was pulverized with a wet pulverizer to obtain a purpuration inhibitor.

Example 17 58.58 parts by weight of water, 3.4 parts by weight of polyoxyethylene tristyryl phenyl ether sulfate (trade name: SORPOL 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl Ether (trade name: SOPROPHOR)
BSU, manufactured by Rhone Poulin Co., Ltd.) 1.1 parts by weight,
Alkyl naphthalene sulfonate condensate (Product name: SU
PRAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd.) (1.1 parts by weight) and an antifoaming agent SM5512 (Toray Dow Corning Silicone Co., Ltd.), 0.02 parts by weight, were mixed and dissolved in 2,2′-dihydroxy- 4, 4
35.8 parts by weight of '-dimethoxybenzophenone was added and dispersed, and the mixture was pulverized with a wet pulverizer to obtain a purpuration inhibitor.

[Example 18] 58.58 parts by weight of water, 3.4 parts by weight of polyoxyethylene tristyryl phenyl ether sulfate (trade name: SORPOL 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl Ether (trade name: SOPROPHOR)
BSU, manufactured by Rhone Poulin Co., Ltd.) 1.1 parts by weight,
Alkyl naphthalene sulfonate condensate (Product name: SU
4-n-octylphenylsali is added to a solution in which 1.1 parts by weight of PRAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd. and 0.02 parts by weight of an antifoaming agent SM5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.) are mixed and dissolved. 35.8 parts by weight of chelate was added and dispersed, and this was pulverized with a wet pulverizer to obtain a purpuration inhibitor.

[Example 19] 58.58 parts by weight of water, 3.4 parts by weight of polyoxyethylene tristyryl phenyl ether sulfate (trade name: SORPOL 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl Ether (trade name: SOPROPHOR)
BSU, manufactured by Rhone Poulin Co., Ltd.) 1.1 parts by weight,
Alkyl naphthalene sulfonate condensate (Product name: SU
Ethyl-2-cyano-3 in a solution prepared by mixing and dissolving 1.1 parts by weight of PRAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd. and 0.02 parts by weight of an antifoaming agent SM5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.). 35.8 parts by weight of 3,3-diphenyl acrylate were added and dispersed,
This was pulverized by a wet pulverizer to obtain a purpuration inhibitor.

Example 20 58.58 parts by weight of water, 3.4 parts by weight of polyoxyethylene tristyryl phenyl ether sulfate (trade name: SORPOL 7556, manufactured by Toho Chemical Industry Co., Ltd.), polyoxyethylene tristyryl phenyl Ether (trade name: SOPROPHOR)
BSU, manufactured by Rhone Poulin Co., Ltd.) 1.1 parts by weight,
Alkyl naphthalene sulfonate condensate (Product name: SU
4-dodecyl-2'- in a solution prepared by mixing and dissolving 1.1 parts by weight of PRAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd. and 0.02 parts by weight of an antifoaming agent SM5512 (manufactured by Toray Dow Corning Silicone Co., Ltd.). Ethoxy
35.8 parts by weight of N, N'-diphenyloxalamide was added and dispersed, and the mixture was pulverized with a wet pulverizer to obtain a purpura inhibitor.

[Example 21] The primary particle diameter was 0.03 to 0.03.
40 parts by weight of 0.05 μm titanium oxide (trade name: ST-440, manufactured by Titanium Industry Co., Ltd.) is dispersed in 60 parts by weight of water, and the mixture is dispersed at 10,000 rpm with a TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.). The mixture was dispersed for 1 minute to obtain a purpura inhibitor.

Comparative Example 1 The primary particle diameter was about 0.04 μm
30 parts by weight of iron oxide (Fe ₂ O ₃ ) was dissolved in 63 parts by weight of water with 7 parts by weight of a surfactant alkylnaphthalenesulfonate condensate (trade name: SUPRAGIL MNS / 90, manufactured by Rhone Poulin Co., Ltd.). Disperse in solution
10,000 homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.)
The mixture was dispersed at 00 rpm for 3 minutes to obtain a purpura inhibitor.

[Comparative Example 2] The primary particle diameter was about 0.15 μm.
Of zinc naphthalene sulfonate condensate (trade name: SUPRAGIL) in 29 parts by weight of zinc oxide and 64 parts by weight of water
MNS / 90, manufactured by Rhone Poulin Co., Ltd.) was dispersed in a solution in which 6 parts by weight were dissolved, and dispersed with a TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) at 10,000 rpm for 3 minutes to obtain a purpura inhibitor.

(Test Example 1) Relationship between near-ultraviolet ray cut rate and purpura: A bent glass having an area of 0.25 m ² (0.5 m × 0.5)
m) into several compartments. In this section, wavelength 3
A near-ultraviolet absorbing film of 00 to 400 nm (each cut ratio is shown in Table 1) was covered, and the degree of purple spots on the turf two weeks after the winter season was evaluated according to the following five grades.

A: No purple spots on the turf were observed. A: Very slight turf purple spots were observed. Δ: slight turf purpura was observed, but no problem occurred. ×: Purple spots on turf were observed. XX: Significant turf purple spots were observed.

[0073]

[Table 1]

As shown in Table 1, the higher the near-ultraviolet ray cut rate, the higher the effect of preventing turf purpura. However, if the cut rate is practically 40% or more, it can be determined that the turf purplish-preventive effect is obtained.

(Test Example 2) Lawn phytotoxicity test Bentgrass was cut into an area of 0.25 m ² (0.5 m × 0.5
m) into several compartments. In this section, the reagents of Examples 1 to 8 and Comparative Examples 1 and 2 were 10 times and 50 times.
After diluting the solution twice, 62.5 ml of the diluted solution was sprayed using a sprayer, and one week later, the growth status of the turf was evaluated according to the following five grades. Spraying was tested in duplicate with two replicates.

-: There was no effect on turf growth. ±: The growth of grass was slightly affected. +: The growth of turf was affected. (Leaf tip withered) ++: Significant effect on turf growth. (70 ~
+++: Significantly affected turf growth and completely died.
(Whole dies)

[0077]

[Table 2]

As shown in Table 2, it can be seen that the purpura-preventing agents of Examples 1 to 8, 14 and 15 have a lower degree of phytotoxicity than Comparative Examples 1 and 2. For Comparative Example 1, 10
Yellowing of leaves at 1/50 and 1/50 dilution, 1 for Comparative Example 2
Growth effects such as leaf withering were observed at 0-fold and 50-fold dilutions.

(Test Example 3) Near-ultraviolet ray cut rate measurement test A bent glass was sized to have an area of 0.25 m ² (0.5 m × 0.5).
m) into several compartments. A non-woven fabric of 0.135 mx 0.135 m is laid at the center of this one section, and the reagents of Examples 1 to 8 and 14 and 20 are diluted 10-fold, and 62.5 ml of the diluent is sprayed. And the ultraviolet ray cut rate of the nonwoven fabric to which the drug was attached was measured. The measurement is performed using an ultraviolet intensity meter UM-1 (UM-36), the measurement wavelength is 310 to 400 nm, and the peak wavelength is 365.
Measured at ± 5 nm. The near-ultraviolet ray cut rate (%) of the drug was calculated by the following equation.

Near-ultraviolet ray cut rate (%) of drug = [near-ultraviolet ray cut rate of nonwoven fabric to which drug is attached (%) − near-ultraviolet ray cut rate of nonwoven fabric (%)]

Further, from the relationship between the near-ultraviolet ray cut rate and the purple spot in Test Example 1, the test agent was evaluated for the purple spot prevention in the following five stages. A: Sufficient prevention of turf purple spots was possible. ：: Effective prevention of turf purple spots was possible. C: Prevention of turf purple spots was possible. X: Almost no turf purple spot prevention effect was observed. XX: No effect of preventing turf purple spots.

[0082]

[Table 3]

As shown in Table 3, it can be seen that the purpura-preventing agents of Examples 1 to 8 and 14 to 21 have practically a near-ultraviolet ray cut rate at which purpura can be prevented.

Test Example 4 Turf Spray Coloring Test Bentgrass was sized to have an area of 0.25 m ² (0.5 mx 0.5).
m) into several compartments. Example 6
８8 of the reagents were diluted 10-fold and 50-fold, and diluted solution 6
2.5 ml was sprayed using a spraying machine, and the coloring state of the turf was investigated.

[0085]

[Table 4]

As shown in Table 4, the purpura preventives of Examples 6 to 7 can maintain the natural color of the turf even after they adhere to the turf. It was found that it adhered to.

(Test Example 5) Adhesion Effect Test Bent glass was weighed with an area of 0.25 m ² (0.5 mx 0.5).
m) into several compartments. Example 8
The test reagents of Comparative Examples 1 to 2 and Comparative Examples 1 and 2 were diluted 50-fold, and 62.5 ml of the diluted solution was sprayed using a sprayer to examine the state of adhesion to grass.

[0088]

[Table 5]

As shown in Table 5, the purpura inhibitors of Examples 8 to 10 had high adhesion to turf and adhered uniformly to turf.

(Test Example 6) Effect test with green spraying Bent glass was applied in an area of 1.0 m ² (1.0 mx 1.0 m).
Divided into The reagents of Examples 11 and 12 were diluted 50-fold in this section, and 200 ml of the diluted solution was sprayed using a sprayer. The bent glass used was Providence, S
R-1020 and Cobra were used, respectively, and spraying was carried out for each medicine in three sections, and the average was obtained.

The first spraying (November 17, 2000), the second
Times (November 28, 2000), the third (December 19, 2000), the fourth
Four times (January 17, 2001), and on March 20, 2001, the greenness, uniformity, and purpura index were investigated.

Greenness: Visual hue of green as a whole [(light) 1 to 5 (dark)] Uniformity: degree of occurrence of purple spots on green surface [(uniform) 1 to 5 (uneven)] Purple spot index: Purple spot area (%) × purple spot color tone [(light) 1
-5 (dark)]

[0093]

[Table 6]

As shown in Table 6, it can be seen that the purpura-preventing agents of Examples 11 and 12 show a high purpura-preventing effect on the untreated section. In addition, in Example 12 in which a near-ultraviolet absorber and a coloring agent were used in combination, it can be seen that two synergistic effects were obtained, and the purpura prevention effect was further enhanced. From these results, it was found that when the purpura inhibitor of the present invention was used in actual green, a sufficient purpura-preventing effect was obtained.

[0095] Growth of (Test Example 7) purpura inhibitor, upright stems number Influence anthocyans system and non anthocyans system bentgrass cultivating it is 1 / 5000a (0.02 m ²⁾ Wagner pots, as in Example 12 The 13 reagents were diluted 50-fold, and 4 ml of the diluted solution was sprayed using a sprayer. For spraying, three pots were tested for each drug, and the average was determined.

The first application (November 6, 2000), the second application
(November 27, 2000), Third (December 18, 2000), Fourth
Four times (January 15, 2001), and on May 15, 2001, the weight of the above-ground mowing and the number of upright stems were investigated.

[0097]

[Table 7]

As shown in Table 7, the purpuration inhibitors of Examples 12 and 13 showed an increase in both the weight of the above-ground portion and the number of upright stems in the anthocyanic and non-anthocyanic bentgrass compared to the untreated plot. As a result, it was confirmed that the purpura inhibitor had an effect of promoting growth, rather than inhibiting growth.

[0099]

Industrial Applicability The present invention can prevent purple spots on turf, especially in bent greens, which cause a deterioration in aesthetic appearance without damaging the turf in the season when the temperature becomes low from late autumn to winter without damaging the turf. And a method for preventing turf purpura using the agent.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) A01N 25/30 A01N 25/30 35/04 35/04 37/18 37/18 Z 37/34 107 37/34 107 37 / 40 37/40 43/64 104 43/64 104 43/647 43/647 F term (reference) 2B022 AA01 AB02 EA10 4H011 AB04 BA01 BA05 BB05 BB06 BB09 BB18 BC03 BC07 BC16 BC18 BC19 DA15 DC04 DD07 DH02 DH03

Claims (8)

[Claims] 1. A turf purpura inhibitor comprising a near-ultraviolet absorber (excluding iron oxide and zinc oxide) for absorbing near-ultraviolet light having a wavelength of 300 to 400 nm. 2. The near-ultraviolet absorber is a benzotriazole-based ultraviolet absorber or has an average particle size of 0.01 to 0.1 μm.
2. The turf purpura inhibitor according to claim 1, which is titanium oxide of m. 3. The turf purpura inhibitor according to claim 1, further comprising a coloring agent. 4. The turf purpura inhibitor according to claim 1, further comprising a surfactant. 5. The turf purpura inhibitor according to claim 4, wherein the surfactant is at least one of a silicone-based surfactant and a dialkyl sulfosuccinate-based surfactant. 6. The turf purpura inhibitor according to claim 1, further comprising a fixing agent. 7. The turf purpura inhibitor according to claim 1, 3, 4 or 6, wherein the turf purpura inhibitor is a water-dispersible preparation. 8. A method for preventing purple spots on turf, which comprises spraying near-ultraviolet absorbers (excluding iron oxide and zinc oxide) for absorbing near-ultraviolet light having a wavelength of 300 to 400 nm on turf.