JPH0977609A - Herbicide phytotoxicity reducer and method for reducing lawn growth damage by herbicide - Google Patents

Abstract

(57) [Abstract] [Solution] A vinyl acetate polymer, an acrylic polymer,
A phytotoxicity-reducing agent for a pre-emergence soil treatment herbicide for turf containing one or more kinds selected from water-soluble acrylic resins and water-soluble alkyd resins as an active ingredient, and the phytotoxicity-reducing agent and pre-emergence soil treatment agent for turf. A method for reducing growth disorders of turf by the use of the herbicide, which comprises spraying the mixture. [Effect] The adsorption of herbicides on the soil can be enhanced, and the migration distance in the soil can be reduced to 1/2 to 1/3 of the conventional migration distance, and a strong thin treatment layer can be formed on the soil surface. It is possible to significantly reduce the lawn growth damage caused by the herbicide.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a phytotoxicity-reducing agent for a pre-emergence soil-treating herbicide for turf and a method for reducing turf growth damage by the herbicide.

[0002]

2. Description of the Related Art Since the climate of Japan is generally warm and rainy, it is said that there are about 100 kinds of weeds that occur in the lawn, and if the lawn is left as it is, the weeds will grow in an instant. In order to prevent such invasion of weeds, a wide variety of herbicides have been developed through many years of research and development, and now,
Over 60 herbicides for turf have been registered as pesticides. In recent years, as the social momentum for environmental protection has increased, it has become important to develop herbicides with less environmental impact in addition to herbicidal effects, safety for humans and animals, economical efficiency, etc. Labor-saving herbicides, such as herbicides mixed with herbicides and fertilizers, have also been developed.

[0003]

In recent years, excellent pre-emergence soil treatment herbicides for preventing weed generation have been developed one after another, but the selectivity between lawn and weed is not physiological selectivity. Most are physically selective based on soil adsorption. That is, there is a possibility that the herbicide may have some influence on the lawn radicles as well as on the weed radicles. Therefore, it is desirable that the treated layer of the pre-emergence soil-treated herbicide (herbicide layer) is as thin and strong as possible near the ground surface. On the other hand, in recent years, a golf course has begun to perform sand graining for the purpose of improving drainage and preventing the occurrence of diseases. For this reason, the sand that is hard to adsorb the herbicide is deposited on the golf course, and the herbicide easily migrates deep into the soil and is easily absorbed from the lawn root. In addition, the grain sand containing a small amount of organic matter and clay has a significant effect not only on the adsorption of the herbicide on the soil but also on the microbial flora in the soil, which reduces the decomposition rate of the herbicide. Furthermore, the lawn system of the lawn does not develop sufficiently and the resistance of the lawn to various stresses decreases, so that it is easily affected by herbicides, and once affected, it is difficult to recover. In addition, golf courses recently developed often have undulations on the fairways,
Under such conditions, even if the herbicide is sprayed uniformly, the herbicide tends to collect in the depression and the lawn is locally affected by the herbicide.

As described above, in recent golf courses, lawns are becoming more susceptible to the effects of herbicides, and the herbicides that have been sprayed are less likely to be adsorbed and decomposed. Soils and topographical structures are becoming a concern, and some measures are needed. However,
Since the year of construction, soil conditions, topography, and management method are different for each golf course and each course, the degree of its influence varies, and it is extremely complicated and difficult to deal with each individual.

[0005]

Means for Solving the Problems Accordingly, the present inventors have
In order to reduce the effect of such a pre-emergence soil-treated herbicide (may be simply referred to as a herbicide below) on such lawns, as a result of various studies, a vinyl acetate polymer, an acrylic polymer, By mixing at least one water-soluble acrylic resin or water-soluble alkyd resin, the adsorption of the herbicide on soil is enhanced, and the migration distance in the soil is reduced from 1/2 to 1/3 of the conventional migration distance. The present invention has been completed by finding that it is possible to reduce the formation of a strong thin treatment layer on the surface of the soil, which can greatly reduce the lawn growth damage caused by the herbicide.

That is, the present invention is, firstly, a pre-emergence soil for turf containing, as an active ingredient, at least one selected from a vinyl acetate polymer, an acrylic polymer, a water-soluble acrylic resin or a water-soluble alkyd resin. Regarding the phytotoxicity-reducing agent for the treated herbicide, secondly, vinyl acetate-based polymer, acrylic-based polymer,
A mixture of a phytotoxicity-reducing herbicide for pre-emergence soil treatment herbicide containing at least one selected from a water-soluble acrylic resin or a water-soluble alkyd resin and a pre-emergence soil treatment herbicide for turf. The present invention relates to a characteristic law for reducing growth disorders of turf.

First, the phytotoxicity reducing agent of the first invention will be described. The phytotoxicity-reducing agent of the present invention contains, as an active ingredient, any one of a vinyl acetate polymer, an acrylic polymer, a water-soluble acrylic resin and a water-soluble alkyd resin, or a mixture of two or more thereof.

The vinyl acetate polymer used in the present invention generally has a molecular weight of about 5,000 which is commercially available.
Up to 300,000 vinyl acetate-based polymers can be used, and if the main component is a vinyl acetate polymer, it may be a copolymer with another resin. Practically, it is preferably contained in the form of an aqueous emulsion, and more preferably in the form of an emulsion containing about 10 to 60% by weight of a vinyl acetate polymer (solid content). Examples thereof include a vinyl acetate polymer emulsion: Boncoat 9305H (containing about 50% of solid content) (Boncoat is a registered trademark of Dainippon Ink and Chemicals, Inc. The description is omitted since it is the same. ), Vinyl acetate / versatiic acid ester / methacrylic acid ester copolymer emulsion: Boncoat 66
20 (contains about 50% of solid content), vinyl acetate / acrylic acid ester copolymer emulsion: Boncoat 9181
(Contains about 50% of solid content) and the like.

Similarly, as the acrylic polymer, there is usually mentioned an acrylic polymer having a molecular weight of about 5,000 to 300,000. If the main component is an acrylic resin, it may be a copolymer with another resin. Practically, it is preferably contained in the form of an aqueous emulsion, and more preferably in the form of an emulsion containing about 10 to 60% by weight of an acrylic polymer (solid content). Examples thereof include acrylic ester / styrene copolymer emulsion: Boncoat EC-740 (containing about 40% of solid content),
Acrylic ester / styrene copolymer emulsion:
Boncoat EC-863 (containing about 50% solid content) and the like can be mentioned.

Similarly, the water-soluble acrylic resin is preferably a solution in practical use, and more preferably a solution containing a solid content of 10 to 60%. For example, generally commercially available Waterzol S744 (containing about 40% of solid content) (Waterzol is a registered trademark of Dainippon Ink and Chemicals, Inc., description is omitted because it is the same below), Waterzol S753 (solid content A preferable content is about 50% content). In addition, as the water-soluble alkyd resin, a solution type is preferable in practical use, and a resin containing a solid content of 10 to 60% is more preferable. For example, generally commercially available Waterzol S311 (containing solid content of about 50%), Waterzol S346 (containing solid content of about 65%) and the like can be mentioned as preferable ones. These solutions may be an aqueous solution, an organic solvent-containing aqueous solution, or an organic solvent solution, but since they are usually diluted with water before use,
It should be compatible with water. The phytotoxicity reducing agent of the present invention is
As the active ingredient, vinyl acetate polymers and acrylic polymers are more preferable, and vinyl acetate polymers are particularly preferable.
When a plurality of active ingredients are contained, as a combination thereof, an aqueous emulsion type, a vinyl acetate polymer and an acrylic polymer as active ingredients, or a solution-form aqueous acrylic resin and aqueous alkyd resin are used. The active ingredient is more preferable.

The pre-emergence soil treatment herbicide referred to in the present invention is
It is a herbicide sprayed before weeds germinate on grass, for example, dithiopyr, prodiamine, bethrosine, pendimethalin, propyzamide, pyributicarb, CAT, cyanadine, atrazine, renacil, napropamide, isoxaben, orthobencarb, bifenox. , Butamiphos, SAP, metolachlor, chlorphthalim, methyl dimuron, cafenstrol and the like. The phytotoxicity-reducing agent of the present invention can contain, if necessary, auxiliary agents or stabilizers used for agricultural chemicals such as solid carriers, liquid carriers, surfactants, spreading agents and binders. Of course, when a commercially available aqueous emulsion or water-soluble resin is used as the active ingredient, an auxiliary agent added in advance may be contained therein.

Next, the second invention of the present invention will be described. A second aspect of the present invention is a method for reducing growth damage of grass caused by a herbicide by mixing and spraying the phytotoxicity-reducing agent and a pre-emergence soil-treatment herbicide for grass. The term "mixed spraying" as used herein means that, when spraying the herbicide, the phytotoxicity-reducing agent of the present invention is added to the pre-emergence soil treatment herbicide for grass directly or together with other auxiliary agents, and the mixture is sprayed. . When used as a mixture with a herbicide, the phytotoxicity reducing agent of the present invention is mixed with a pre-emergence soil treatment herbicide for turf so that the final dilution ratio is usually 10 to 1000 times, preferably 50 to 100 times, Dilute with water. By doing so, the herbicide and the phytotoxicity reducing agent can be applied at one time, which is efficient. In the case of mixed spraying, other chemicals such as a bactericide may be mixed and sprayed. Spraying is a method of spraying mixed herbicides,
It may be carried out according to the spraying timing, spraying amount, etc. Of course, even if the phytotoxicity-reducing agent and the herbicide are separately sprayed, the effect can be exhibited, but it is not preferable because the spraying requires time and effort. By spraying the mixture as described above, the soil adsorption rate of the herbicide is increased, and the herbicide remains on the soil surface.
It becomes possible to grow grass lawn soundly.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The active ingredient in the safener according to the present invention is at least one selected from vinyl acetate polymers, emulsion type acrylic polymers, water-soluble acrylic resins or water-soluble alkyd resins. Particularly preferably, the vinyl acetate polymer and the acrylic polymer are aqueous emulsion type having a solid content of 10 to 60%, and the water-soluble acrylic resin and the water-soluble alkyd resin have a solid content of 10 to 60%.
It is in the form of a 60% solution. Further, as a method for reducing growth disorders of turf by the phytotoxicity-reducing agent of the present invention, when spraying a pre-emergence soil-treating herbicide for turf, for example, put the herbicide in a drum or the like and dilute it to a spraying concentration. , Dilution ratio 10
There is a method of mixing the present drug damage reducing agent so that the amount is about 1000 times and then spraying the mixture. If this herbicide is mixed with a herbicide, the migration distance of the herbicide in the soil can be reduced, so a strong thin treatment layer is formed only on the soil surface, and the herbicide absorbed by the lawn root is absorbed. Since the amount can be reduced, the damage to the growth of grass can be reduced.

[0014]

EXAMPLES Next, the present invention will be specifically described with reference to examples and test examples, but the present invention is not limited to the examples.

Example 1 Vinyl acetate / versatiic acid ester / methacrylic acid ester copolymer emulsion: 70% of Boncoat 6620 (containing about 50% of solid content)
By weight, 5 parts by weight of ethylene glycol and 25 parts by weight of water were mixed with stirring to obtain 100 parts by weight of a chemical damage-reducing agent having an active ingredient concentration of 35%.

Example 2 Vinyl acetate / acrylic acid ester copolymer emulsion: 70 parts by weight of Boncoat 9181 (containing about 50% of solid content), ethylene glycol 5
By weight, 25 parts by weight of water and 100 parts by weight of water were mixed with stirring to obtain 100 parts by weight of a phytotoxicity reducing agent having an active ingredient concentration of 35%.

Example 3 Acrylic ester / styrene copolymer emulsion: 87.5 parts by weight of Boncoat EC-740 (containing about 40% of solid content), 5 parts by weight of ethylene glycol and 7.5 parts by weight of water. Mix under stirring,
100 parts by weight of a phytotoxicity reducing agent having an active ingredient concentration of 35% was obtained.

[Example 4] Acrylic ester / styrene copolymer emulsion: 70 parts by weight of Boncoat EC-863 (containing about 50% of solid content), 5 parts by weight of ethylene glycol and 25 parts by weight of water were mixed with stirring. As a result, 100 parts by weight of a phytotoxicity reducing agent having an active ingredient concentration of 35% was obtained.

Example 5 Water-soluble acrylic resin: Watersol S744 (containing about 40% of solid content) 87.5
By weight, 5 parts by weight of ethylene glycol and 7.5 parts by weight of water were mixed with stirring to obtain 100 parts by weight of a chemical damage-reducing agent having an active ingredient concentration of 35%.

Example 6 Water-soluble alkyd resin: 70 parts by weight of Waterzol S311 (containing about 50% solid content), 5 parts by weight of ethylene glycol and 25 parts by weight of water were mixed with stirring to obtain an effective ingredient concentration. 35% phytotoxicity reducer 10
0 parts by weight were obtained.

[Example 7] Vinyl acetate polymer emulsion: 7 parts of Boncoat 9305H (containing about 50% of solid content)
0 parts by weight, 5 parts by weight of ethylene glycol and 25 parts by weight of water were mixed with stirring to obtain 100 parts by weight of a chemical damage reducing agent having an active ingredient concentration of 35%.

[Example 8] Vinyl acetate polymer emulsion: 3 parts of Boncoat 9305H (containing about 50% of solid content)
0 parts by weight, vinyl acetate / versatic acid ester / methacrylic acid ester copolymer emulsion: Boncoat 6
620 (containing about 50% of solid content) 40 parts by weight, acrylic ester / styrene copolymer emulsion: 30 parts by weight of Boncoat EC-740 (containing about 40% of solid content) were mixed with stirring to prepare an active ingredient. Drug damage reducer with a concentration of 47% 1
00 parts by weight were obtained.

[Example 9] 50 parts by weight of water-soluble acrylic resin: Waterzol S753 (containing about 50% of solid content), water-soluble alkyd resin: Waterzol S346
50 parts by weight (containing about 65% of solid content) were mixed under stirring to obtain 100 parts by weight of a chemical damage-reducing agent having an active ingredient concentration of 57.5%.

(Test Example 1) Examples 1, 2, 3, 4, 5,
6. A safener prepared according to 6 and dithiopyr (32% emulsion), prodiamine (63% wettable granule), CAT (5
0% wettable powder), propizzamide (50% wettable powder), 1: 1 mixture of river sand: field soil, and a pot for migration test (diameter 10 cm, thickness 1 cm PVC pipe 1
0 pieces were stacked, fixed with a vinyl tape, and mixed and sprinkled in a ratio shown in Table 1 and Table 2 to a pot having a non-woven fabric attached to the bottom. After 24 hours from the spraying, an artificial rainfall of 6 mm was performed 5 times every hour, that is, a total of 30 mm of artificial rainfall was applied.
Then wait for the soil moisture to settle down (after 2-3 days),
The soil was sampled every 1 cm from the ground surface and transferred to a plastic pot with a diameter of 5 cm. Seedlings of C. cinerea are sown on this transferred soil, and germination and growth of C. cinerea are 0 (no effect).
Evaluation was carried out on a scale of 5 (complete withering), and the migration distance of the drug into the soil was determined. The results are shown in Tables 1 and 2.

[0025]

[Table 1]

[0026]

[Table 2]

Dithiopyr alone 192 g (active ingredient amount) /
With 10a treatment, the drug showed 2-3 cm migration into soil. On the other hand, when the phytotoxicity-reducing agent shown in Example 1 was mixed so as to be diluted 70 times, the migration into soil was 1-2 cm, which was about 2/3 to 1/2 of that in the case of the single treatment. .
Similarly, when the phytotoxicity-reducing agents shown in Examples 2, 5, and 6 were mixed so as to be diluted 70-fold, migration into soil was 1-2 cm.
It became about 2/3 to 1/2 of the case of the single treatment. Furthermore, in the phytotoxicity-reducing agents shown in Examples 3 and 4, 70
Not only double dilution but also mixed treatment such as 700-fold, dithiopyr transfer to soil is 1-2 cm,
It became about ⅔ to ⅔ of the single use. When a herbicide other than dithiopyr was used, the transfer of the herbicide to the soil was reduced by mixing the phytotoxicity-reducing agent, as in the case of using dithiopyr.

(Test Example 2) A safener and a dithiopyr (32% emulsion), prodiamine (63% granular wettable powder), CAT (50% wettable powder), propyzamide prepared according to Examples 1, 2 and 4. (50% wettable powder) was mixed and sprayed at a ratio shown in Tables 3 and 4 to a migration test pot filled with soil in which river sand: field soil was mixed 3: 1. 5 hours of artificial rainfall of 6 mm every hour from 24 hours after spraying, that is, a total of 3
An artificial rainfall treatment of 0 mm was applied. After waiting for the soil moisture to settle down, soil was sampled from the ground surface every 1 cm and transferred to a plastic pot having a diameter of 5 cm. The crabgrass was sown on the transferred soil, and the germination and growth of the crabgrass were evaluated on a scale of 6 from 0 (no effect) to 5 (complete withering) to determine the migration distance of the drug into the soil. The results are shown in Tables 3 and 4.

[0029]

[Table 3]

[0030]

[Table 4]

Dithiopyr alone 192 g (active ingredient amount) /
With 10a treatment, the drug showed a migration in soil of 3-4 cm. On the other hand, when the phytotoxicity-reducing agent shown in Example 1 was mixed so as to be diluted 35 times, the migration into soil was 1-2 cm, which was about 1/2 to 1/3 that in the case of the single treatment. .
Similarly, when the phytotoxicity-reducing agent shown in Example 4 is mixed in such a manner that it is diluted 35 times, migration into soil is 1-2 cm,
It was about one-third to one-third that of the single treatment. Furthermore, in the phytotoxicity-reducing agent shown in Example 2, dithiopyr transfer to the soil was 1-2 cm even when mixed treatment was performed not only for 35-fold dilution but also for 70-fold dilution, which is about half that of single use. It became one-third. When a herbicide other than dithiopyr was used, the transfer of the herbicide to the soil was reduced by mixing the phytotoxicity-reducing agent, as in the case of using dithiopyr.

(Test Example 3) The safeners prepared according to Examples 1, 2 and 4 and herbicides (dithiopyr (32% emulsion), prodiamine (63% granule wettable powder), pen, which are used in amounts higher than usual, are used. Dimethalin (45% flowable), propyzamide (50% wettable powder), bethrosin (58% granular wettable powder)) was cultivated by sticking it on sandy soil (cut the sod thickness to 3 cm in advance) It was sprinkled together). After spraying, 100 mm artificial rain treatment was applied, and thereafter cultivation was carried out for 3 months. After 3 months, the growth condition of the underground part and the appearance of the above-ground part of Koroshishiba were examined, and the growth was evaluated in 6 stages from 0 (no effect) to 5 (no growth at all). The results are shown in Tables 5 and 6.

[0033]

[Table 5]

[0034]

[Table 6]

As a result of treating Kojishiba with about 5 times the usual dose of any of the reagent agents including dithiopyr, the growth of the underground part was suppressed. However, although the effect of the herbicide was not completely eliminated by the mixed treatment of Examples 1, 2, and 4 so that the mixture was diluted 35 times, compared to the case of the herbicide alone treatment, the growth of the underground portion was suppressed. Significantly reduced.

[0036]

The phytotoxicity-reducing agent for pre-emergence soil treatment herbicide for turf of the present invention enhances soil adsorption of the herbicide by mixing and spraying with the herbicide, so that the migration distance in the soil can be reduced by the conventional method. It can reduce the migration distance from 1/2 to 1/3, can form a strong thin treatment layer on the soil surface, and can reduce the amount of herbicide absorbed by the lawn root. The lawn growth damage caused by the above herbicides can be significantly reduced.

Claims (6)

[Claims] 1. A vinyl acetate polymer, an acrylic polymer,
A phytotoxicity-reducing agent for a pre-emergence soil treatment herbicide for turf, which comprises at least one selected from water-soluble acrylic resins or water-soluble alkyd resins as an active ingredient. 2. The phytotoxicity reducing agent according to claim 1, wherein the vinyl acetate polymer and the acrylic polymer are aqueous emulsions. 3. The phytotoxicity-reducing agent according to claim 1, wherein the water-soluble acrylic resin and the water-soluble alkyd resin are in solution. 4. A vinyl acetate polymer, an acrylic polymer,
A mixture of a phytotoxicity-reducing herbicide for pre-emergence soil treatment herbicide containing at least one selected from a water-soluble acrylic resin or a water-soluble alkyd resin and a pre-emergence soil treatment herbicide for turf. A characteristic law for reducing growth disorders. 5. The method for reducing growth disorders of turf according to claim 4, wherein the vinyl acetate polymer and the acrylic polymer are aqueous emulsions. 6. The method for reducing growth disorders of turf according to claim 4, wherein the water-soluble acrylic resin and the water-soluble alkyd resin are in a solution form.