JPS58140004A - Fungicide for agricultural and horticultural purposes - Google Patents

Abstract

PURPOSE:The titled fungicide that contains a specific bipyridine derivative as an active ingredient, thus being useful for preventing and curing diseases in a variety of crops, because of its extremely low toxicity to human, animals and fishes, no chemical injury to crops and high effectiveness even against microorganisms resistant to customary fungicides. CONSTITUTION:The objective fungicide contains a bipyridine derivative of formulaI(R<1>, R<2> are lower alkyl, halogen, nitro; formula II is formula III or IV) as an active ingredient. A carrier or assistants are added to the above described compound and they are prepared in the form of an emulsion, wettable dust or powder and used to prevent and cure rice sheath blight, gray mold in crops and a variety of sclerotium diseases. The dose is 0.1-10kg, preferably 0.1-5kg/ha based on the active ingredient.

Description

[Detailed description of the invention] The present invention relates to a fungicide for agriculture and horticulture.

Conventionally, various agricultural and horticultural fungicides have been developed to control numerous agricultural pathogens. However, most of these are: (1) have extremely low toxicity to animals, animals, and fish, (2) have little phytotoxicity to agricultural crops, and (3)
) It does not satisfy all the requirements, such as exhibiting a bactericidal effect against drug-resistant bacteria, which has been a problem for several years.

As a result of extensive research in view of the current situation, the present inventors have found that a bipyridine derivative represented by the following general formula [■] satisfies the requirements (1) to (3) above and is effective in preventing various crop diseases. It has been found to be effective for treatment. The present invention was completed based on this knowledge.

That is, the present invention relates to a compound of the general formula [wherein R1 and R2 are the same or different and represent a lower alkyl group, a halogen atom, or a nido group.

Regarding an agricultural and horticultural fungicide characterized by containing a bipyridine derivative represented by the above as an active ingredient, the bipyridine represented by the above general formula [I], 7ml conductor is the above (1).
It is a turtle that satisfies all of the requirements of ~ (3). That is, the bipyridine derivative represented by the general formula [I] has extremely low toxicity to livestock and fish, and has little phytotoxicity to agricultural crops, and can also exhibit an excellent killing effect against drug-resistant grasshoppers. As described above, the bipyridine derivative of the general formula CI) has many excellent compatibility properties, and therefore, the use of the bipyridine derivative as a fungicide for agricultural and horticultural purposes is extremely useful in agriculture.

Examples of the lower alkyl groups represented by R1 and R2 in the general formula [I''I] include methyl, ethyl, and
Bill, Isozuo Bill, Louptyl, sac-Butyl,
Examples of the halogen atom include tart-butyl and the like, and examples of the halogen atom include a chlorine atom and a bromine atom.

In the present invention, any compound can be effectively used as long as it belongs to general formula [I]. General Formula 1 Formula % Examples of diseases to be controlled that the fungicide of the present invention exhibits an excellent control effect include, for example, rice sheath blight, gray mold of agricultural and horticultural crops, and various sclerotia diseases.

The bactericidal agent of the present invention containing the bipyridine derivative represented by the above general formula [I] as an active ingredient can be prepared using a suitable solid carrier, liquid carrier,
It can be prepared into any form such as granules, powders, emulsions, aqueous solutions, tablets, oils, sprays, atomizers, etc. using suspending agents, spreading agents, etc. The carriers used include clay, kaorishi, beshitonite talc, acid clay, diatomaceous earth, calcium carbonate, Nido Diluz, Desidun, gum arabic, carbon dioxide, phreosy, water, beshizen, and keshitonite. ,alcohol,
Examples include acetone, bovine silane, methylnaphthalene, Schiff 0 + Satsushi, and animal and plant fatty acid esters. Examples of suspending agents, spreading agents, etc. include common surfactants such as soaps, sulfuric acid esters of higher alcohols, alkyl sulfosinates, quaternary ammonium salts, and polyalcohols.

The amount of the compound represented by general formula CI) in the fungicide of the present invention prepared as described above can be appropriately determined depending on the usage form 41K. For example, in the form of an emulsion or wettable powder, it is preferably in the range of 0.1 to 90% by weight, and in the form of a powder or oil, it is preferably 0.1 to 10% by weight.
It is appropriate to set it within the range of degrees.

When using the fungicide of the present invention, it can be applied to areas requiring a bactericidal effect by spraying, spraying, coating, etc. in the same way as known bactericidal agents. The application amount can be determined as appropriate, but for example, when the fungicide of the present invention is used for agricultural and horticultural purposes, it is usually 1
As a guideline, the amount of active ingredient per hectare should be 0.1-10Kf, preferably 0.1-5Kf11 degrees.
Of course, this can be increased or decreased as appropriate depending on the plant and its degree of disease. It can also be used in combination with, for example, other fungicides, insecticides or herbicides, fertilizer substances, soil conditioners, etc.

The present invention will be explained in more detail with reference to examples and formulation examples below, but the types and mixing ratios of additives to the compounds of the present invention are not limited to these and may be varied within a wide range. The examples are a part of typical tests, and it goes without saying that the compound of the above general formula [I] has a wide range of applications as an agricultural and horticultural fungicide.

Example 1 A test agent for preventing effects on rice sheath blight was diluted with water and sprayed at a rate of 5 cc per pot. 6 hours later, rice sheath blight fungus (Rh1zoctoniα
zoLani) was inserted into the leaf sheath and placed in a thermostatic box at a temperature of 30°C and a humidity of 951 or higher to allow the disease to develop. After 7 days, the degree of damage in each area was determined from the morbidity rate and severity of disease, and the control value was calculated according to the following formula. The drug damage was determined by visual observation. The results are shown in Table 2.

Disease severity: When the affected leaf sheath position in one plant is the leaf sheath: 41
When the affected leaf sheath position in the plant is the n-1 leaf sheath: 3rL-'l
:2%-3#:l Damage level = Disease strain rate The same applies to the table below.

Example 2 Rice sheath blight curing effect test Rice sheath blight fungus (Rhizo-ctoF) was cultivated in a pot with a diameter of 9 cm at the 6th leaf stage of nine rice varieties (variety Nihonbare).
&ia zolani) was inserted and inoculated and kept in a constant temperature and humidity box at a temperature of 30° C. and a humidity of 95° C. or higher for 3 days. 3
After a day, a powder according to Formulation Example 3 was sprinkled at a rate of 2 f per pot. Seven days after spraying, measure the newly formed lesions, calculate the control value, and show the results in Table 3. Incidentally, the disease severity, damage level, and control value were in accordance with the examples.

Table 3 *Active ingredient CCH, A303'331g2・%H4
Example 3 Botrytis blight preventive effect Kuju yuri grown in a bot with a diameter of 91 (variety: Shokin Kosei)
When the plant begins to develop its second true leaves, dilute a hydrating agent according to Formulation Example 2 with water and spray it at a rate of 5 cc per pot. After 6 hours, Botrytis ci
garea) ()jli son wave spray inoculation, temperature 2
Place the seeds in a thermostatic box at 5°C and a temperature of 9591 or higher to develop the disease.After 7 days, count the number of lesions on the first leaf, and calculate the control value according to the following formula. The results are shown in Table 4.

Table 4 Example 41 [Test on control effect against drug-resistant Phytocompetitor Benzi!
Gray mold fungus (13
Atrytiz cingratx) was used to conduct a Botrytis mold control effect test in the same manner as in Example 3. The method for investigating the onset of disease and calculating the control value was the same as in Example 3.

The results were as shown in Table 5.

Table 5 *Active ingredients 11 C-C, H9 ■ As is clear from the comparison between these results and the results of Example 3, the comparative control drug becizimitadyl fungicide has no effect on Wild Sonata (drug-susceptible bacteria). The compound of the present invention exhibits a controlling effect on drug-resistant bacteria, but has almost no controlling effect on drug-resistant bacteria.On the other hand, the compound of the present invention shows the same high controlling effect on drug-resistant bacteria as on susceptible bacteria. Ta.

Formulation Example 1 By mixing 10 parts of Emulsion Compound 41, 75 parts of acetone, 5 parts of diethylene nonylphenol ether in polio, and 10 parts of rubenzenesulfosic acid sorter in alcohol, the main agent concentration is 10.
Obtain emulsion of vomit.

Formulation Example 2 250 parts of wettable powder compound A, 3 parts of sodium dodecyl penzecysulfonate, 2 parts of polyethylene diethylene lauryl ether, and 45 parts of diatomaceous powder are thoroughly ground and mixed to obtain a wettable powder having a base ingredient content of 50.

Formulation Example 3 By thoroughly pulverizing and mixing 1 part of powder compound 43, 51 parts of talc, 46.5 parts of 9-olin, 0.5 part of isozylene sulfate, and 1 part of calcium stearate, the main ingredient content is 19
Obtain powder G.

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Claims (1)

[Claims] ■ General formula [In the formula, R1 and R2 are the same or different and represent a lower alkyl group, a J10 Geshi atom, or a Nido0 group. An agricultural and horticultural fungicide characterized by containing a bipyridine derivative represented by the following as an active ingredient.