JP2639409B2 - How to control grass disease - Google Patents

Description

The present invention is used as a fungicide for agricultural and horticultural use before or at the onset of soil diseases of turf, to prevent the occurrence of various diseases that impair the growth of turf, Alternatively, it relates to a method for preserving lawn by treating.

Conventional technology Large patches, brown patches,
Spring baldness etc. occurs on grasses such as golf courses and green areas,
The withering of the lawn is a major factor impairing the aesthetics of the lawn. Once these diseases occur, they settle in the grassy rhizosphere soil and are known as diseases that are extremely difficult to control.

At present, as a method for controlling these lawn soil diseases, a method of spraying a chlorothalonil agent, a thiuram agent, a captan agent, a benomyl agent or the like is widely used.

However, in terms of crop safety, workability due to a short spray interval, and the control effect itself, it cannot be said that a complete control means has yet been provided. At present, these fungicides are sprayed 10 to 16 times a year, and it is a fact that the occurrence is barely suppressed by spraying them at intervals of about one week, especially when disease is likely to occur.

In addition, as a method of economically controlling general diseases, there is a method of spraying an inorganic copper agent at a concentration of 300 to 600 ppm, but this method has almost no effect on controlling lawn soil diseases, It is not used at all because of the risk of causing phytotoxicity.

Furthermore, when these existing control measures are used, the lesions that have already occurred are suppressed, but the lesions themselves remain, so it takes a long time to recover the aesthetics that have been damaged once. It has become. For this reason,
There has been a strong demand for the development of control means for suppressing the occurrence of disease over a long period of time, exhibiting a therapeutic effect even on existing lesions, and promptly restoring and maintaining the appearance.

Problems to be Solved by the Invention The present invention eliminates the drawbacks of the conventional techniques as described above, and prevents the occurrence of various diseases that impair the growth of lawn without impairing the aesthetic appearance of the lawn, or eliminates the disease that has occurred. The aim is to provide an effective way of treating.

Means and Action for Solving Problems Copper 8-oxyquinoline is a yellow-green crystal in which water and organic solvents are insoluble. Due to its low toxicity, it is designated as a safe pesticide under the Poisonous and Deleterious Substances Control Law.

However, since 8-oxyquinoline copper has a characteristic yellow color, it has a drawback that leaves a clear drug spot on the foliage of the sprayed plant and contaminates the plant with yellow. From the viewpoint of contamination of this plant, the concentration of copper 8-oxyquinoline used has been used at most in the range of 400 to 700 ppm, but at this concentration, it has no effect on lawn brown patches, large patches, etc. I couldn't.

The present inventors have eliminated the use of 8-oxyquinoline copper at such a low concentration, and have studied a method of using a high concentration that was not conceived hitherto. Furthermore, regarding the contamination of plants at the time of using such a high concentration, in consideration of taking new measures, as a result of studying improvement of various preparations, it was found that a blue dye / pigment was contained in a preparation of 8-oxyquinoline copper. As a result, the inventors have found that the problem of yellow contamination is also solved, and completed the present invention.

That is, 8-oxyquinoline copper has a characteristic yellow color. When the copper is sprayed at a high concentration on the lawn, the entire surface of the lawn is colored yellow, which considerably impairs the aesthetic appearance of the lawn. After the quinoline copper adheres to the spray liquid and the turf and is dried, the quinoline copper exhibits a beautiful green color due to the coloring effect of the blue color of the dye and pigment and the yellow color of 8-oxyquinoline copper. Therefore, by spraying 8-oxyquinoline copper to which blue dye is added at a high concentration of 1,600 to 3,200 ppm on a lawn, disease can be prevented for 2 to 3 weeks without yellowing the lawn in appearance. Furthermore, when sprayed on existing lesions, it not only prevents the spread of the disease, but also promotes the regeneration of new leaves from the rhizome of the diseased part, and compared with conventional control methods. We found that we could restore the beauty of the lawn in a very short day.

When high concentration treatment is performed with an inorganic copper agent such as basic copper chloride, the medicinal effect is considerably improved, but it is impossible to exhibit an extremely high therapeutic effect such as high concentration treatment of copper 8-oxyquinoline, and The advantages of the method of using copper 8-oxyquinoline according to the present invention are very obvious in view of causing severe phytotoxicity.

As described above, the method of the present invention in which a bactericidal composition containing 8-oxyquinoline copper and a blue dye / pigment is applied to a lawn at a high concentration reduces the number of times of controlling the number of diseases in a field such as an environment greening area or a golf course. The present invention provides a lawn disease control method that reduces and stably protects lawn from disease for a long period of time and is extremely useful from the viewpoint of user safety and economy.

Among the dyes and pigments used in the practice of the present invention, the blue pigment may be any of inorganic pigments and organic pigments such as lake pigments and cyanine blue, but navy blue and ultramarine are particularly preferred. The blue dye may be, for example, a blue dye such as Food Blue No. 1, Food Blue No. 2, or the like.
When a water-soluble blue dye is used, 8-oxyquinoline copper and the blue dye are separated during the drying process of the spray liquid and color unevenness may occur locally, so that blue pigments are generally superior. . For example, an aqueous dispersion obtained by adding the above blue pigment to 8-oxyquinoline copper in 1/40 to 3/40 (parts by weight based on 8-oxyquinoline copper) exhibits a very favorable green color tone. Spraying the aqueous dispersion on the lawn gives the lawn a beautiful green aesthetic after drying. Water-insoluble dyes can be used in the same manner as the pigments described above.

1600~3200ppm in preventing scatter lawn disease, by 1 spray per lawn 1 m ² of the 8-oxyquinoline copper solution 3200ppm concentrations to treat incurred lesions, turf brown patch, large patches, spring bald diseases Etc. can be controlled very effectively.

Next, a formulation example of a bactericidal composition containing 8-oxyquinoline copper and a blue dye / pigment, and a test example in which the bactericidal composition containing 8-oxyquinoline copper and a blue dye / pigment were used for controlling a lawn disease were described. Show.

Examples Formulation Example 1. Hydrating agent 88 parts of 8-oxyquinoline copper, 2 parts of ultramarine blue, 4 parts of sodium ligninsulfonate and 3 parts of polyoxyethylene alkyl allyl ether as a dispersing and wetting agent, and 3 parts of white carbon as a grinding aid , And the mixture is thoroughly mixed and then pulverized to obtain a wettable powder.

Formulation Example 2. Flowable agent 40 parts of 8-oxyquinoline copper, 1.5 parts of navy blue and 3 parts of polyoxyethylene alkylphenol phosphate ester salt and 1 part of polyoxyethylene alkyl ether as a dispersant were mixed well with 43.5 parts of water, After 7 parts of a 3% aqueous suspension of xanthan gum prepared in advance and 4 parts of ethylene glycol are added and mixed, wet pulverization is performed to obtain a flowable agent.

Test Example 1. Test for controlling turf brown patch A 1m solution of a drug solution diluted to a predetermined concentration immediately before the onset of turf (variety: Pencross Bentgrass) where brown patches occur regularly
Sprayed at a rate of one per ^two . Spray every week,
A total of four applications were made. 5 cubic meters of ² wards per district.

One week after the final spraying, the lesion area ratio was measured, the phytotoxicity on the turf and the turf soil were examined. The results shown in Table 1 below were obtained.

 The lesion area ratio was calculated by the following equation.

Example 2 Test of therapeutic effect of turf on brown patch 1 m ^{2 of} a drug solution diluted to a predetermined concentration was applied to turf (cultivar: Pencross Bentgrass) where the brown patch became severely ill.
Sprayed once at a rate of one per spray. Was the District 1 2m ^{2 2} series system.

Investigations were conducted twice before spraying and 5 days after spraying in the same manner as in Example 1, and the results in Table 2 below were obtained.

Example 3. sod large patch therapeutic effect test turf (cultivar: Zoysia tenuifolia) in lesions of large patch (diameter of about 3m) 3 equal portions that occur once the drug with a predetermined concentration at a rate of 1 m ² per Sprayed. It was a three-part system.

The investigation was performed on the recovery rate of the lesions one week after spraying, and the results in Table 3 below were obtained.

 The lesion recovery rate was calculated by the following equation.

EFFECT OF THE INVENTION By using the control method of the present invention, soil diseases such as brown patches, large patches, and spring baldness occurring on lawns can be safely and economically controlled with less labor. Furthermore, even with respect to the existing lesions, which had conventionally only been imperfectly controlled, the therapeutic effect of 8-oxyquinoline copper, the effect of promoting the regeneration of new leaves, and the blue dye / pigment retain the green appearance. Since a very early recovery is possible, the method of the present invention is an extremely effective means for controlling lawn diseases occurring in golf courses, green areas and the like, and preserving the appearance of the lawn.

Claims (1)

(57) [Claims] 1. A method for controlling lawn diseases, comprising treating a lawn at a high concentration with a fungicidal composition containing 8-oxyquinoline copper and a blue dye / pigment.