JPS58134006A - Antibacterial agent for agricultural and horticultural use - Google Patents

Abstract

PURPOSE:To provide an antibacterial agent for agricultural and horticultural use, containing a specific compound as an active component, exhibiting excellent controlling effect against bacterial blight in the agricultural and horticultural fields such as bacterial leaf blight of rice plant, dry rot of vegetables, etc., free from phytotoxicity to the crop such as rice plant, etc., and suitable especially for the application to soil. CONSTITUTION:The objective agent contains, as an active component, the compound of formula (R is lower alkyl) known as a synergist with insecticides, e.g. bis(0,0-dimethylthiophosphoryl) disulfide, bis(0,0-diethylthiophosphoryl)disulfide, etc. The compound is prepared in the form of granules, wettable powder, pellets, emulsifiable concentrate, etc. by mixing with a carrier, adjuvant, etc., and used directly as it is or after dilution with water. Suitable rate of application: 0.5- 80kg of the active component per 1ha of the plowed land.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antibacterial agent for agriculture and horticulture, which is characterized by containing a compound represented by the formula (wherein R represents a lower alkyl group) as an active ingredient.

The compound of formula (1) used in the present invention, i.e., bis(
0,0-dimethylthiophos-7-olyl) disulfide is a known compound, for example, German Patent No. 2001817 describes its synergistic action with organophosphorus insecticides for foliage spraying. Although it is known to be used in combination with other compounds, the insecticidal and antibacterial effects of this compound itself are not known, nor is it known as an insecticide or an antibacterial agent for agriculture and horticulture.

As a result of various studies, the present inventors have surprisingly found that when the compound represented by formula (I) is applied to soil, various bacterial diseases for agricultural and horticultural purposes, namely rice leaf blight (
Xanthomonas campestrjs PV
.

oryzac), rice blight bacterial disease (Pseudo
monas glumae).

Eggplant, tomato, green pepper, potato bacterial wilt (Pseu)
domonae solanacearum), vegetable dry rot disease (Erwinia aroideae) of Chinese cabbage, cabbage, carrots, radish, potatoes, etc.
Cucumber spot bacterial disease earn estris PV,
orygae), p-buff wildfire disease (PseudO-
The present invention has been completed based on the discovery that the compound of the present invention exhibits an outstanding control effect when controlling insects such as Monas tabaci, and does not exhibit any phytotoxic effects on crops such as rice and vegetables. be.

Examples of the lower alkyl group represented by R in formula (1) include methyl group, ethyl group, n-propyl group, 1-propyl group, n-butyl group, butyl group, n-amyl group, n-hexyl group, etc. Examples include alkyl groups having 4 carbon atoms.

Typical examples of the compound of formula (1) include the following compounds (Table 1). It is made into powders, fine granules, granules, emulsions, water-use agents, etc. by methods commonly used in the field of agricultural chemical manufacturing, by mixing pesticides with pesticides or adjuvants to promote or stabilize their effects. can be used.

In actual use, these various formulations can be used directly or diluted with water as desired.

The agrochemical auxiliary agents mentioned herein include carriers (diluents) and other auxiliary agents such as spreading agents, emulsifiers, wetting agents, dispersants, fixing agents, and disintegrants.

As a carrier, 1. Either solid carrier or liquid carrier may be used. Solid carriers include clay, kaolin, talc, diatomaceous earth,
Silica 1. , ;Liquid carrier such as calcium carbonate □
.

Examples include alcohol, toluene, xylene, methylnaphthalene, cyclohexane, dimethylformamide, dimethyl sulfoxide, animal and vegetable oils, fatty acids, fatty acid esters, and the like.

In addition, surfactants are usually used as emulsifiers or dispersants, such as anionic surfactants such as higher alcohol sodium sulfate, stearyltrimethylammonium chloride, polyoxyethylene alkylphenyl ether, lauryl betaine, and cationic surfactants. surfactant,
Examples include nonionic surfactants and amphoteric surfactants.

Any of the preparations may be used alone as is, or may be mixed with fertilizers or other agricultural and horticultural antibacteriological agents.

When used in these forms, the content of the compound of the present invention in these preparations varies depending on the dosage form, etc., but is not more than 1%.
It is used in a range of 95% to 95%, preferably 2 to 90%.

The preferred content varies depending on the form of the preparation.

For example, in the case of a powder, the content of the compound of the present invention is 1 to 20%, and the content of the auxiliary agent is 80 to 99%, and in the case of an emulsion, the content of the compound of the present invention is 2 to 40%, and the content of the auxiliary agent is 80 to 99%. The content of the compound is 60 to 9 days, and in the case of water use agent, the content of the compound of the present invention is 20 to 80 days, and the content of the adjuvant is 20 to 9 days.
In the case of granules and microgranules, the content of the compound of the present invention is 1-20%, and the content of auxiliary agents is 80-99%.

Furthermore, when used in the field, it is appropriate to use the compound of the present invention in a range of 0.59 to 80 Kf per 1 ha.

As a method of applying the present compound and its preparation, soil application is preferred.

A511 Next, the formulation of the present invention will be explained in more detail.4 However, the types and mixing ratios of additives are not limited to these, and can be used in a wide range.

Note that "parts" means "parts by weight."

Formulation Example 1 Fine Granules 5 parts of the compound of the present invention 161 (bis(0,0-dimethylthiophosphoryl) disulfide), 6 parts of bentonite, and 9 parts of clay are uniformly mixed and ground to form a thick powder. Separately 74
Put 80 parts of non-oil-absorbing mineral coarse powder of ~105μ in a suitable mixer, add 20 parts of water while rotating to moisten it, add the above-mentioned thick powder, cover it and dry it to form a fine granule. do.

Formulation Example 2 Powder 5 parts of the compound of the present invention/162 (bis(0,0-diethylthiophosphoryl) disulfide), 46 parts of talc and 49 parts of clay are mixed and ground to form a powder.

Formulation Example 3 Wettable powder Compound A63 of the present invention (80 parts of bis(0,0-dinormalpropylthiophosphoryl) disulfide and 15 parts of kaolin)
1 part, 3 parts of higher alcohol sodium sulfate, and 2 parts of sodium polyacrylate are mixed and ground to obtain an irrigation agent.

Formulation Example 4 Granules After mixing 10 parts of the compound of the present invention/161 (bis(0,0-dimethylthiophosphoryl) disulfide, 35 parts of diatomaceous earth, 23 parts of bentonite, 30 parts of talc and 2 parts of a disintegrant, 18 parts of water was added. In addition (wet the product evenly, then extrude it through an injection molding machine and granulate it, dry it, put it in a crusher, and then size it with a granulator.

It is made into granules with a particle size of 0.6 to 1 mm.

Formulation Example 5 Emulsion 20 parts of the compound of the present invention (bis(0,0-diisopropylthiophosphoryl) disulfide) was dissolved in 63 parts of xylene, and a mixture of alkylphenol ethylene oxide condensate and calcium alkylbenzenesulfonate (8:2) was dissolved in 63 parts of xylene. ) 1 part and 7 parts are mixed and dissolved to form an emulsion.

The basic rule is to dilute it with water and use it as an emulsion.

Next, the effects of the present invention will be explained using experimental examples.

Experimental example 1 Rice leaf blight control test 115 by soil application
．． Rice (variety: Zennanfu) was grown on 000 RWAGNER BOT for 2 months. The granules of the present invention prepared by the method of Formulation Example 4 were applied to the soil for a predetermined maximum of 11'i'·1, and 3 days later, the rice leaf blight fungus (X
anthomonas campestrie PV
- Nisoe sawogami) was inoculated into the front leaves and placed in a greenhouse at 28℃ for 24 hours.
The plants were infected for a period of time and then allowed to develop in the greenhouse.

As a control drug, 8% granules of tetrabenazole (active ingredient:
A similar test was conducted using 1,2-benzisothiazol-3-one-1,1-dioxide).

Fourteen days after inoculation, the rate of diseased seedlings and lesion length were investigated.

The results are shown in Table 2.

The results shown in Table 2 show that the compound of the present invention effectively controls rice leaf blight when applied to soil, and does not cause any phytotoxicity to rice.

Applicant: Nippon Kayaku Co., Ltd.

Claims (1)

[Scope of Claims] 1. An antibacterial agent for agriculture and horticulture, which contains a compound represented by the formula (wherein R represents a lower alkyl group) as an active ingredient.