JPH0242803B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to agricultural and horticultural fungicides with improved action. Although various compounds are known as agricultural and horticultural fungicides, it is difficult to completely control powdery mildew and anthracnose. Therefore, there is a need for a fungicide that has an excellent bactericidal effect against powdery mildew and anthracnose, and is highly safe for humans, livestock, and crops. The present invention provides 3-(3,5-
This is an agricultural and horticultural fungicide containing dichlorophenyl)-1-isopropylcarbamoylhydantoin (compound A) and basic copper chloride in a weight ratio of 1:1 to 6 as active ingredients. Compound A is a new type of 3,5-dichloroaniline type agricultural and horticultural fungicide described in Japanese Patent Publication No. 52-42888. It is known to have excellent effects on Basic copper chloride has also been shown to be effective against bacterial spot and downy mildew of cucumbers, and Phytophthora of potatoes and tomatoes. However, these fungicides are hardly expected to be effective against powdery mildew and anthracnose, which are known as pathogens of agricultural and horticultural crops that are difficult to control. As a result of various comparative experiments, the present inventors found that the combined use of Compound A and basic copper chloride produced unexpectedly excellent effects against powdery mildew and anthracnose on fruit and vegetables. It was discovered that pathogenic bacteria can be completely controlled. Moreover, the synergistic action of these two types of compounds significantly increases the bactericidal activity against the pathogenic bacteria, so the amount of each component used can be significantly reduced. Furthermore, by using these compounds in combination, the efficacy of each component against other pathogenic bacteria is not lost, so that a wide range of pathogenic bacteria can be effectively controlled. The fungicide of the present invention contains 1 part by weight of compound A,
It is necessary to contain basic copper chloride in a proportion of 1 to 6 parts by weight (as Cu). The fungicide of the present invention may be used as a mixture of Compound A and basic copper chloride, but it is usually mixed with a carrier or diluent, and optionally with an adjuvant, etc., to form powders, wettable powders, and powders. Dust agent (FD agent)
It is used in formulations such as As carriers or diluents, the usual solid or liquid substances commonly used in agriculture can be used. Examples of solid carriers include clay, talc,
Kaolin, bentonite, diatomaceous earth, white carbon, etc. or mixtures thereof, liquid carriers include:
For example, acetone, xylene, alcohol, DMF,
Examples include DMSO and mixtures thereof. In addition, nonionic, anionic, cationic, amphoteric surfactants, polymer compounds, etc. are used as auxiliary agents to improve properties such as dispersion, suspension, emulsification, adhesion, and fixation of drugs. used. Examples of surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene fatty acid ester, alkyl sulfonate, and polyoxyethylene alkyl sulfate; examples of polymer compounds include carboxymethyl cellulose, polyvinyl Alcohol, gum arabic, etc. are used. The content of the active ingredient in the disinfectant of the present invention is 2 to 20% by weight (equivalent to 0.5 to 10% as Cu), preferably 4 to 12% by weight (equivalent to 1.5 to 6% as Cu) in the case of powder.
When using it, it is used within the range of 3 to 4 kg per 10 are. In wettable powders, the content of the active ingredient is 20 to 90% by weight (equivalent to 8 to 50% as Cu), preferably 40 to 80% by weight (equivalent to 12 to 40% as Cu).
When used, it is diluted to a concentration of 0.04 to 0.20%, preferably 0.08 to 0.18%, and per 10 ares.
Spray in the range of 150-200. In addition, in the case of FD agents, the content of the active ingredient is 12 to 80% by weight (equivalent to 3.5 to 40% as Cu), preferably 40 to 60% by weight.
(equivalent to 10 to 30% as Cu), and when used, it is appropriate to spray in the range of 200 to 300 g per 10 are. The fungicide of the present invention may be used with other drugs depending on the purpose of use, such as fungicides, acaricides, insecticides, herbicides,
It can also be used in combination with plant growth regulators, fertilizers, etc. Parts in the following examples mean parts by weight. Compound B means basic copper chloride [CuCl ₂ .3Cu(OH) ₂ ]. Formulation Example 1 Compound A 1 part Compound B 3 parts Isopropyl acid phosphate 0.3 parts Clay 95.7 parts The above ingredients are uniformly mixed and pulverized to form a powder. Formulation Example 2 Compound A 20 parts Compound B 50 parts Sodium ligninsulfonate 2 parts Polyvinyl alcohol 2 parts Clay 26 parts The above ingredients are uniformly mixed and pulverized to prepare a wettable powder. Formulation Example 3 Compound A 5 parts Compound B 15 parts White carbon 50 parts Finely powdered clay 30 parts The above ingredients are mixed and ground uniformly to prepare an FD agent. Test Example 1 Powdery mildew control effect test on cucumber powdery mildew A hydrating powder prepared in the same manner as in Formulation Example 2 was applied twice after 7 days and 14 days to cucumber seedlings (Shinko A) grown in a greenhouse at the 4-leaf stage. The suspension was diluted with water to a predetermined concentration and thoroughly sprayed on leaves. After the leaves were air-dried, powdery mildew-infected seedlings were placed around the chemically treated cucumber seedlings to encourage natural infection. The test was conducted in 1 section, 1 pot, and 4 consecutive sessions. The investigation was conducted 7 days after the final application of the drug, and the degree of disease onset was expressed using the following index, and the degree of disease onset and control value were calculated using the following formulas. The results are shown in Table 1. Disease index: 0: No disease 1: Less than 25% of leaves are affected 2: 25-49% of leaves are affected 3: 50-74% of leaves are affected 4: More than 75% of leaves are affected Disease severity (%) = Σ (infection index x number of leaves) / 4 x number of investigated leaves x
100 Control value (%) = Disease severity in untreated area - Disease severity in treated area / Disease severity in untreated area × 100 In addition, to determine the presence or absence of synergism of the mixed preparation,
The expected pesticidal value (PE) of the mixed preparation was calculated by applying the calculation formula of Colby et al., and compared with the actual value (PC). PE (%) = Pa + Pb (100-Pa) / 100 Pa: Actual pesticidal value of compound A (%) Pb: Actual pesticidal value of compound B (%) Judgment criteria PC>PE: Synergistic effect PC=PE: Additive effect PC<PE: Antagonistic effect

[Table] Test Example 2 Anthracnose control effect test on cucumber Anthracnose control effect A wettable powder prepared in the same manner as Formulation Example 2 was diluted with water to a predetermined concentration on young cucumber seedlings (Shinko A) grown in a greenhouse at the 4-leaf stage. The mixture was made cloudy and thoroughly sprayed on the leaves. After the leaves were air-dried, a spore suspension of Colletotrichum lagenarium was placed on the cucumber leaves (30 conidia per field using an Olympus microscope at 10x10 magnification).
) was spray-inoculated, and the humidity chamber (temperature 25±2℃, humidity 95℃) was inoculated.
±5%) for one day, and the next day, the disease was induced in a greenhouse. The test was conducted in 1 section, 1 pot, and 4 consecutive sessions. The investigation was conducted 5 days after the application of the drug, and the disease severity (%) and control value (%) were calculated according to Test Example 1. The results are shown in Table 2.

【table】

[Table] Test Example 3 Powdery mildew control effect test on green pepper A hydrating powder prepared in the same manner as Formulation Example 2 was applied twice at 7-day intervals to young green pepper seedlings (ace pepper) at the 5th true leaf stage grown in a greenhouse. was diluted and suspended in water to a predetermined concentration and thoroughly sprayed on the leaves. After the leaves were air-dried, powdery mildew-infected seedlings were placed around the chemically treated green pepper seedlings to encourage natural infection. The test was conducted in 1 section, 1 pot, and 5 consecutive sessions. The investigation was conducted 7 days after the final application of the drug, and the disease severity (%) and control value (%) were calculated according to Test Example 1. The results are shown in Table 3.

[Table] Test Example 4 Eggplant powdery mildew control effect test
No. 2), a wettable powder prepared in the same manner as in Formulation Example 2 was diluted and suspended to a predetermined concentration, and thoroughly sprayed on the leaves twice at 7-day intervals. After the leaves were air-dried, powdery mildew-infected seedlings were placed around the chemically treated eggplant seedlings to encourage natural infection. The test consisted of 1 section, 1 pot, and 5 consecutive sessions. The investigation was conducted 7 days after the final application of the drug, and the disease severity (%) and control value (%) were calculated according to Test Example 1. The results are shown in Table 4.

【table】

[Table] Test Example 5 Watermelon anthracnose control effect test Watermelon seedlings (striped balls) at the 15th true leaf stage were diluted with a wettable powder prepared in the same manner as Formulation Example 2 to the specified concentration three times at 7-day intervals. Suspended and thoroughly sprayed on leaves. After the leaves were air-dried, anthracnose-infected seedlings were placed around the chemically treated watermelon seedlings to encourage natural infection. The test was conducted in 1 area, 10 plants (20 m ² ), and in triplicate.
The investigation was conducted 10 days after the final application of the drug, and the disease severity (%) and control value (%) were calculated according to Test Example 1. The results are shown in Table 5.

【table】

Claims (1)

[Claims] 1. An agricultural and horticultural fungicide characterized by containing 3-(3,5-dichlorophenyl)-1-isopropylcarbamoylhydantoin and basic copper chloride as active ingredients in a weight ratio of 1:1 to 6. .