JPH0452241B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to (a) general formula [] [In the formula, R ¹ , R ² and R ³ are the same or different,
Represents a lower alkyl group. ] 1 of the N-phenyl carbamate compound shown by
and (b) methyl 1-(butylcarbamoyl)benzimidazole-2-(ylcarbamate, 2-(2-furyl)benzimidazole, 2
- An agricultural and horticultural disinfectant characterized by containing as an active ingredient one or more types selected from the benzimidazole fungicide group consisting of (4-thiazolyl)benzimidazole and methyl benzimidazol-2-ylcarbamate. The present invention relates to a composition. Benzimidazole-based fungicides and thiophanate-based fungicides (hereinafter referred to as benzimidazole-thiophanate-based fungicides) have shown excellent control effects against various pathogenic bacteria parasitic on agricultural and horticultural crops, and have been used for agricultural and horticultural use since around 1970. It is widely used as a fungicide and has greatly contributed to increasing crop production. However, when these fungicides are continuously sprayed on crops, drug-resistant bacteria spread, reducing the control effectiveness of the fungicides, often making them practically unusable. If spraying a fungicide does not produce the expected control effect and prevent disease outbreaks, farmers and other fungicide users will suffer severe damage. Furthermore, it is known that bacteria that are resistant to any of the benzimidazole/thiophanate fungicides are also resistant to other fungicides in this group, exhibiting so-called cross-resistance. Therefore, in a field where no pest control effect is observed even after spraying the commercially available benomyl, no control effect can be expected even if other benzimidazole/thiophanate fungicides are sprayed. In fields where drug-resistant bacteria are prevalent, the use of benzimidazole/thiophanate fungicides must be discontinued, but there are many known cases in which the density of drug-resistant bacteria does not decrease even after discontinuing their use.
Once drug-resistant bacteria emerge, the effects will be felt for a long time. In addition, in such fields, the target disease is controlled by spraying other fungicides to which drug-resistant bacteria do not show cross-resistance, but benzimidazole-thiophanate fungicides are more effective at controlling diseases. Very few are effective, making accurate control difficult. Taking the above circumstances into consideration, the present inventors have made extensive efforts to develop a bactericidal agent that selectively exhibits a bactericidal effect against drug-resistant bacteria.
- It has been found that phenyl carbamate compounds are bactericidal agents that exhibit strong selective bactericidal effects against drug-resistant bacteria. However, in actual fields where pathogens are prevalent, drug-resistant bacteria and wild bacteria that are sensitive to benzimidazole/thiophanate fungicides (hereinafter referred to as susceptible bacteria) often coexist; - It cannot be said that a sufficient disease control effect is necessarily obtained by using either the thiophanate fungicide or the N-phenyl carbamate compound represented by the above general formula [] alone. Under the above circumstances, as a result of various studies, the present inventors have determined that (a) one or more N-phenyl carbamate compounds and (b) methyl 1-(butylcarbamoyl)benzimidazol-2-ylcarbamate, 2-(2-furyl)benzimidazole, 2-(4-thiazolyl)benzimidazole and methyl benzimidazole-2-
By using a mixture of N-phenylcarbamate and one or more selected from the group of benzimidazole fungicides, both N-phenylcarbamate compounds or benzimidazole fungicides are more effective than when used alone. The present inventors have discovered that when used in combination, a high disease control effect is exhibited even at low concentrations, leading to the present invention. Therefore, the composition of the present invention has high practical value as a fungicide that exhibits excellent pest control effects in any field. Furthermore, the composition of the present invention can be used in fields where drug-resistant bacteria have not appeared, even when there is concern about the spread of drug-resistant bacteria due to continuous spraying of benzimidazole-thiophanate fungicides.
Its appearance can be prevented. N represented by the general formula [] used in the present invention
- As a phenyl carbamate compound, for example, the formula Isopropyl N-(2-fluoro3,
4-diethoxyphenyl) carbamate (hereinafter referred to as
It is written as compound a. ). Next, Table 1 shows the benzimidazole fungicides used in the present invention.

[Table] Since the composition of the present invention has excellent bactericidal activity against a wide range of types of filamentous fungi, it can be used to control various pathogens occurring in agriculture and horticulture. For example, powdery mildew (Podosphaer a leoucotricha), Venturia inaecualis, Sclerotinia mali on apples, Gloeosporium kaki on oysters, Sclerotinia cinerea, Sclerotinia sclerosis (Sclerotinia mali) on oysters. Gladosporium carpophilum), Botrytis cinerea, Elsinoe ampeline, Glomerella
cingulata), sugar beet brown spot fungus (Cercospora
beticala), peanut brown spot fungus (Cercospora
arachidicola), Cercospora
personata), powdery mildew of barley (Erysiphe graminis f.sp.hordei), eye spot fungus (Cercosporella herpotrichoides), red snow rot fungus (Fusarium nivale), powdery mildew of wheat (Erysiphe graminio f.sp.tritici) , cucumber powdery mildew (Sphaerotheca fuliginea),
Vine blight (Mycosphaerella melonis), Botrytis cinerea, Cladosporium cucumerineem, Tomato leaf mold (Cladosporium fulvum), Botrytis cinerea, Strawberry powdery mildew (Sphaerotheca humuli) , Botrytis cinerea on hops, Erysiphe cichoracearum on tobacco, Diplocarpon rosae on roses, Elsinoe faweetti on tangerine, Penicillium
italicum), green mold fungus (Penicillium
digitatum), and can be used to control drug-resistant bacteria. On the other hand, the composition of the present invention is highly safe for humans, livestock, and fish, and can be used without causing any practical harm to agriculturally useful crops. When actually applying the composition of the present invention, it can be used as it is without adding other ingredients, or it can be mixed with a carrier to make it easier to use as a disinfectant, and it can be used in commonly used forms such as powder, wettable powder, oily powder, etc. ,emulsion,
It is formulated into tablets, granules, microgranules, aerosols, flowables, etc. and applied. The above formulations generally contain 1.0 to 95.0% by weight of active compound (including mixed ingredients), preferably
Contains 2.0 to 80.0%, usually 10 to 10 are
An application amount of 100g is appropriate. Furthermore, the concentration used is preferably in the range of 0.005% to 0.5%, but the amount and concentration used depend on the dosage form, application time, method, location,
Since it varies depending on the target disease, target crop, etc., there is no problem in increasing or decreasing the amount without being limited to the above range. Furthermore, it can also be used in combination with other fungicides, herbicides, plant growth regulators, and insecticides. For example, S-n-butyl S-p-tert-butylbenzyldithiocarbonimidate, O,O-
Dimethyl O-(2,6-dichloro-4-methylphenyl) phosphorothioate, N-trichloromethylthio-4-cyclohexene-1,2-dicarboximide, polyoxin, streptomycin, zinc ethylene bisdithiocarbamate, tetrachloroisophthalonitrile, 8 -Hydroxyquinoline, N'-dichlorofluoromethylthio-
N,N-dimethyl-N'-phenylsulfamide,
1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)-
Bactericidal agents such as 2-butanone, methyl N-(2,6-dimethylphenyl)-N-methoxyacetyl-2-methylglycinate, aluminum ethyl phosphite, and phenoxy-based agents such as 2,4-dichlorophenoxyacetic acid. Herbicides, diphenyl ether herbicides such as 2,4-dichlorophenyl 4'-nitrophenyl ether, triazine herbicides such as 2-chloro-4,6-bisethylamino-1,3,5-triazine, 3-(3,4-dichlorophenyl)-
Urea herbicides such as 1,1-dimethylurea, carbamate herbicides such as isopropyl N-(3-chlorophenyl)carbamate, and thiol carbamate herbicides such as S-(4-chlorobenzyl)N,N-diethylthiol carbamate. agent, 3,4
- Acid anilide herbicides such as dichloropropionanilide, uracil herbicides such as 5-bromo-3-sec-butyl-6-methyluracil, 1-1'-dimethyl-4,4'-bipyridinium chloride, etc. Pyridinium salt herbicide, N-(phosphonomethyl)
Glycine, O-ethyl O-(2-nitro-5-methylphenyl) N-sec-butylphosphoramidothioate or S-(2-methyl-1-piperidylcarbonylmethyl) O,O-di-n-bropyl Phosphorus herbicides such as dithiophosphate, α,
α,α-trifluoro-2,6-dinitro-N,
Toluidine herbicides such as N-dipropyl-p-toluidine, O,O-dimethyl O-(4-nitro-
Organophosphorus insecticides such as 3-methylphenyl) phosphorothioate, α-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)isovalerate, 3-phenoxybenzyl 2,2-dimethyl-
Pyrethroid insecticides such as 3-(2,2-dichlorovinyl)cyclopropanecarboxylate and α-cyano-3-phenoxybenzyl 2,2-dimethyl-3-(2,2-dibromovinyl)dichloropropanecarboxylate It can be used in combination with other agents, and neither of them will reduce the pesticidal effect of each agent alone, and a synergistic effect is also expected by mixing. Next, the present invention will be explained in more detail with reference to formulation examples and test examples. The compounds used in the formulation examples and test examples are indicated by compound symbols in Table 1. First, a formulation example will be shown. Formulation example 1 Powder Compound a (1 part), Compound C (1 part), Clay (88
Part) and talc (10 parts) are thoroughly ground and mixed to obtain a powder with a base ingredient content of 2%. Formulation example 2 Wettable powder Compound a (20 parts), Compound B (10 parts), Diatomaceous earth (45 parts)
), white carbon (20 parts), wetting agent (sodium lauryl sulfate) (3 parts), and dispersing agent (calcium lignin sulfonate) (2 parts) can be thoroughly ground and mixed to create a wettable powder with a base ingredient content of 30%. obtain. Formulation Example 3 Wettable powder Compound a (10 parts), Compound A (40 parts) or Compound D (40 parts), diatomaceous earth (45 parts), wetting agent (calcium alkylbenzenesulfonate) (2.5 parts), and dispersing agent (lignin) Calcium sulfonate) (2.5
Part) is thoroughly ground and mixed to obtain a hydrating agent with a base ingredient content of 50%. Next, a test example is shown. Test Example 1 Powdery mildew control effect on cucumber A 90 ml plastic pot was filled with sandy loam, and cucumber (variety: Sagami Hanshiro) was sown. This was cultivated at room temperature for 8 days to obtain cucumber seedlings with expanded cotyledons. A water-diluted solution of the test compound in the form of an emulsion or a wettable powder was sprayed onto the foliage of the seedlings until a sufficient amount of droplets adhered to the leaf surface. After air-drying the chemical solution, seedlings were infected with powdery mildew fungus (Sphaerotheca fuliginea).
A conidial suspension obtained by mixing drug-resistant and susceptible bacteria was inoculated by spraying. The plants were placed in a greenhouse and cultivated for 10 days to develop the disease, and then the disease state was observed. The results are shown in Table 2. After the onset of illness, it was calculated by the following method. That is, depending on the appearance of lesions on the investigated leaves, 0,
The disease was classified into indexes of 0.5, 1, 2, and 4, and the severity was calculated using the following formula. (Infection Index) (Infection Status) 0... No bacterial flora or lesions observed on the leaf surface. 0.5 ... Bacterial flora or lesions are observed on the leaf surface in less than 5% of the leaf area 1 ... Bacterial flora or lesions are observed on the leaf surface in less than 20% of the leaf area. 2: Bacterial flora or lesions are observed on the leaf surface in less than 50% of the leaf area. 4...Bacterial flora or lesions are observed on the leaf surface over 50% of the leaf area. Disease severity = Σ {(Sickness index) x (Number of leaves)} / (Number of inspected leaves)
×4 ×100 (%) Next, the control value was calculated from the following formula. Control value = 100 - (incidence in compound treated area) / (incidence in non-treated area) x 100 (%)

【table】

Claims (1)

[Claims] 1 (a) General formula [In the formula, R ¹ , R ² and R ³ are the same or different,
Represents a lower alkyl group. ] 1 of the N-phenyl carbamate compound shown by
(b) Methyl 1-(butylcarbamoyl)benzimidazol-2-ylcarbamate, 2-(2-
1 selected from the group of benzimidazole fungicides consisting of (furyl) benzimidazole, 2-(4-thiazolyl)benzimidazole and methyl benzimidazole-2-ylbamate.
A disinfectant composition for agricultural and horticultural use, characterized in that it contains seeds or more as an active ingredient.