JPS6120521B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an agent for controlling plant damage caused by the combination of 3-hydroxy-5-methylisoxazole and tetrachloroisophthalonitrile. 3-Hydroxy-5-methylisoxazole (hereinafter abbreviated as HIO) and tetrachloroisophthalonitrile (hereinafter abbreviated as TPN) are both substances that have excellent plant pathogen control effects, but both have a limited antibacterial spectrum. are different. For example, HIO agents cannot prevent diseases caused by Rhizopus spp., and TPN agents are incomplete in controlling Fusarium spp. For this reason, to control rice seedling damping off, etc., a method is used in which HIO agents and TPN agents are used in combination, and this method has been shown to be highly effective. However, when both are used at the same time, it is known that various chemical injuries may occur, such as failure of fir to stand up, growth failure and browning of roots, crown and root abnormalities, suppression of germination, growth problems of seedlings, browning of coleoptiles, and malformations. . Therefore, in order to avoid these drug-induced harms, both drugs should be administered at 3 doses.
Applications must be applied at intervals of ~10 days, which is a major practical drawback. The present inventors have conducted various studies to control this type of drug damage caused by the combination of HIO and TPN, and have found that nicotinamide exhibits excellent effects. The present invention is based on this knowledge, and consists of a 3-hydroxy-5-
This is a control agent for plant damage caused by the combined use of methylisoxazole and tetrachloroisophthalonitrile. Nicotinic acid amide is a physiologically active substance known as one of the vitamin B complexes, and is also known to have plant growth regulating effects and bactericidal effects for agriculture and horticulture (Japanese Patent Publication No. 50-26451 and the same). 51
-Refer to each publication No. 34446). However, it was completely unexpected that this substance exhibited a controlling effect against the above-mentioned chemical damage. According to the research conducted by the present inventors, this drug damage control effect is extremely specific to nicotinamide.
It has been found that it is impossible to control this type of phytotoxicity even by using other plant growth regulators such as α-naphthalene acetic acid, indole acetic acid, kinetin, and gibberellin. For example, when gibberellin is used, inhibition of root length is hardly recovered, and other chemical damages are not alleviated. In the present invention, nicotinamide can be used in either the form of a free base or an acid addition salt. Examples of the salt include inorganic acid salts such as hydrochloride and sulfate, and examples of organic acid salts include oxalate. Nicotinic acid amide, which is the active ingredient of the present invention, is
It has the effect of controlling phytotoxicity in all agricultural and horticultural plants where HIO and TPN are used together. Rice is particularly preferred as the target plant. The pest control agent of the present invention is applied to farms where HIO and TPN have already been applied or will be used, and can be used in the form of nicotinamide alone, but can also contain HIO and/or TPN. However, it is of course possible to keep these three components separate and use them simultaneously or in any order. In the latter case, each component may be used at appropriate intervals. The pesticidal agent of the present invention can be used as a formulation such as an emulsion, a wettable powder, a powder, or a granule.
At this time, the formulation can be prepared using conventional auxiliary materials such as various carriers, solvents, surfactants, etc. Furthermore, the phytotoxicity control agent of the present invention may contain or be used in combination with, for example, fertilizers, insecticides, fungicides, herbicides, plant growth regulators, and the like. Depending on the purpose of this pest control agent, for example, soil application,
Used according to common application methods such as foliar spraying. The effective amount of nicotinic acid can be varied over a wide range and varies depending on the target crop and other conditions, but it is usually 1/10 to 50 times the amount of HIO and TPN, preferably 1 to 10 times. amount (both weight). Example 1 5 parts of nicotinamide, 45 parts of talc and clay
Mix and grind 50 parts thoroughly to make a powder. When using it, mix it directly into seedbed soil. Example 2 50 parts of nicotinamide are dissolved in 100 parts of water.
To use, dilute with water and sprinkle on the floor. Example 3 40 parts of nicotinamide, 2.4 parts of hydroxyisoxazole, 7.5 parts of tetrachloroisophthanitrile
Part, Solpol 7080 (Toho Chemical surfactant) 1
and 10 parts of white carbon with clay added.
Make 100 parts, mix well and grind to make a wettable powder. To use, dilute with water and sprinkle on the floor. Example 4 0.24 g of Tachigaren powder (active ingredient: 4% hydroxyisoxazole, manufactured by Sankyo) and 50% nicotinic acid amide powder in the amount shown in Table 1 were thoroughly mixed with 200 ml of Kureha rice cultivation soil (manufactured by Kureha Chemical). After sowing 30 rice seeds (variety: Nipponbare), add 200 times a 500 times solution of Daconyl hydrating agent (active ingredient: 75% tetrachloroisophthalonitrile, manufactured by Kumiai Chemical Co., Ltd.)
ml was irrigated. The plants were then grown at 5,000 lux and 30°C, and the phytotoxicity control effect was investigated after 13 days. The results are shown in Table 1.

[Table] Example 5 6g of Tachigaren powder was added to seedbed soil (paddy soil 2
Mix 5 parts of Kureha paddy rice cultivation soil (1 part) and (30
x 60 x 3 cm), and 200 g of paddy rice seeds (variety: Nipponbare) were sown therein. Next, 500 ml of a 500 times solution of Daconyl hydrating powder and a mixture of 50% nicotinamide hydrating powder in the amount shown in Table 2 were irrigated, respectively.
The plants were grown at 3000 lux and 30°C, and their phytotoxicity control effect was investigated after 14 days. The results are shown in Table 2. In addition, the symbols in the table have the above-mentioned meanings.

[Table] Example 6 Rhizopus bacteria and Fusarium bacteria were cultured in a bran medium, and 100 g of this culture and bed soil 5 were mixed in a seedling box (30 x 60 x 3 cm), and then 6 g of Tachigaren powder and 10 nicotinic acid amide were added. % powder was mixed well. Paddy rice seeds (variety: Nipponbare)
After 200 g of seeds were sown and covered with soil, 500 ml of a 500 times solution of Daconyl hydrating agent was irrigated. After sprouting at 30°C for 48 hours, the status of bacterial development and the effect of controlling chemical damage were investigated. The results are shown in Table 3 together with the cases without treatment and without the addition of nicotinic acid amide. The symbols in the table have the meanings given above.

[Table] As is clear from these results, the effects of HIO and TPO against soil pathogens were not adversely affected at all by the use of nicotinamide, and furthermore, the phytotoxicity caused by the combination of these was completely controlled. It will be done.

Claims (1)

[Scope of Claims] 1. An agent for controlling plant damage caused by a combination of 3-hydroxy-5-methylisoxazole and tetrachloroisophthalonitrile, which contains nicotinamide as an active ingredient. 2. The chemical damage control agent according to claim 1, which contains 3-hydroxy-5-methylisoxazole and/or tetrachloroisophthalonitrile and nicotinic acid amide.