JPS6117804B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides highly refined machine oil with a sulfonation value of 10 or less (hereinafter referred to as highly refined machine oil) and 1,2-bis(3-methoxycarbonyl-2-thioureide).
This invention relates to an agricultural and horticultural fungicide characterized by being blended with benzene (hereinafter referred to as MCTB). Conventionally, machine oil has been widely used as a disease control agent for agriculture and horticulture. However, it is mainly limited to winter sprays, such as for controlling late rot disease in grapes.
Moreover, the disease control activity of machine oil is inferior to that of conventional known horticultural fungicides. Therefore, when used, the concentration used is higher than that of other drugs, usually 4000 ~
It is used at a high concentration of 9000ppm. For this reason, spraying during the growing season has the disadvantage that phytotoxicity is likely to occur. In recent years, pesticide pollution has been debated and there is a strong demand for the safe use of pesticides, so there has been a strong desire to develop a new agent that takes advantage of the characteristics of conventional machine oils and overcomes their shortcomings. In view of these circumstances, we conducted extensive research on a mixture of machine oil and known agricultural and horticultural fungicides. As a result, as mentioned above, highly refined machine oil
The present invention was completed based on the discovery that mixing MCTB exhibits extremely excellent control activity, particularly against cucumber powdery mildew and tomato leaf mold. The effects of the agricultural and horticultural fungicidal composition according to the present invention are not limited to the additive effects of the pesticidal effects exerted by each single agent, but also the extremely outstanding synergistic effects that are difficult to estimate from the effects of single use of each agent. is demonstrated. The agricultural and horticultural fungicidal composition of the present invention has a lower sulfonation value than conventional machine oil and can be used in a smaller amount than conventional machine oil, so there is no fear of chemical damage and it is safe. You can use it with care. Moreover, since it exhibits an outstanding pesticidal effect when combined with other fungicide components, it can be an extremely useful fungicide that requires only a small number of applications. In carrying out the present invention, highly refined machine oil and
The mixing ratio with MCTB is preferably set to an appropriate value depending on the conditions of use and the target to be controlled, but according to tests conducted by the present inventors, MCTB is mixed with 100 parts by weight of highly refined machine oil. It is practically appropriate to blend 2 to 50 parts by weight. Although the dosage form of the agricultural and horticultural fungicidal composition of the present invention can be appropriately selected depending on the usage situation, it is usually preferable to use it as a suspension. Additionally, active agents used in the suspension include, but are not necessarily limited to, sorbitan monolaurate, lauryl sulfate, polyoxyethylene sorbitan monooleate, and white carbon. Moreover, by using other fungicides and insecticides in combination with the agricultural and horticultural fungicidal composition of the present invention, a wide range of pests and diseases can be controlled at the same time. Next, the effects of the agricultural and horticultural fungicide composition of the present invention will be specifically illustrated using test examples. Test example 1 (Kiyu cucumber powdery mildew control effect test) Multi-cultivated seedlings of Ki cucumber (variety: Sou Hanshiro) were grown in a vinyl greenhouse field (fertilization amount: per 10 ares)
The base fertilizer is 15 kg of each component of CDU Kasei's N:P:K and 600 kg of compost.
The plants were irrigated once at a rate of 150/200 times solution per 10 ares) and planted in two staggered rows with a spacing of 50 cm. Each test area is 1 area
It was a double system of 10 stocks. The chemical spraying was carried out four times every 7 to 9 days from the initial onset of powdery mildew on cucumbers. per are
Sprayed 150 to 250 particles with a small shoulder sprayer. All sample spray liquids contained 0.01% of the spreading agent Hiten A (a trade name for a spreading agent containing 30% polyoxyethylene alkyl ether; ``Hiten'' is a registered trademark of Hokuko Chemical Industry Co., Ltd.). used. The disease onset survey was conducted by surveying the area of lesions on 16 to 20 fresh leaves of 10 parent trees in each district (340 to 386 leaves surveyed in total) 7 days after the final spraying, and calculating the severity of the disease based on the following evaluation criteria. At the same time, the control value (%) in each sprayed plot was determined by comparing it with the disease severity in the non-sprayed plot. Disease severity survey criteria Disease index 4: Area of powdery mildew spots on cucumber leaves 75% or more 3: 〃 50 to less than 75% 2: 〃 25 to less than 50% 1: 〃 1 to less than 25% 0: Disease onset do not have. Disease severity = Σ (number of infected leaves by severity x index by severity) / number of investigated leaves × 100 In addition, in the present invention, whether or not there is synergy by mixing two types of drugs is determined by the following formula: Expected value of the mixture ( PE) was determined, and the presence or absence of a synergistic effect was determined from the relationship with the actual measured value (PC). PE (%)=Pa+Pb(100-Pa)/100 However, in the formula, Pa indicates the actually measured control value (%) by spraying highly refined machine oil, and Pb indicates the actually measured control value (%) by spraying MCTB. Judgment is based on the following criteria. Judgment criteria (degree of synergy) PC>PE: Synergistic effect PC=PE: Additive effect PC<PE: Antagonistic effect The results are shown in Table 1.

[Table] Test example 2 (Tomato leaf mold control effect test) Multi-cultivated seedlings of tomatoes (variety: Hikari) were placed in a field (the amount of fertilizer applied was the same as in test example 1), with a ridge width of 180 cm.
Two rows were planted with a spacing of 45 cm. Each test plot has 2 of 8 plants in 1 plot.
It was made a continuous system. Chemical spraying should be done from 5 to 5 days after the initial appearance of tomato leaf mold.
The test diluted chemical solution used in Example 1 at a predetermined concentration was sprayed three times every 7 days at a rate of 150 to 200 per 10 ares using a small shoulder sprayer. All sample spray liquids contained a spreading agent Hi-Ten A.
was added in an amount of 0.01%. The disease outbreak survey will be carried out 8 days after the final spraying, starting from the lowest 5
Based on the evaluation criteria of Test Example 1, the degree of disease in 35 leaflets in one section (total of 70 leaves) at the tip of the leaf blade at the ~8th node was determined from the percentage of diseased area. The control value (%) of the sprayed area was calculated. Also,
The presence or absence of synergy was determined in the same manner as Test Example 1.
The results are shown in Table 2.

[Table] Example 1 (Suspending agent) Add 70 parts of highly refined machine oil (all parts by weight below), 3 parts of sorbitan monolaurate, and 2 parts of polyoxyethylene sorbitan monooleate, and then use a diet mill to reduce the suspension to 5μ or less. finely ground into
After mixing 20 parts of MCTB and 5 parts of white carbon using a stirrer, the mixture is thoroughly stirred using a homogenizer, colloid mill, or homomixer to obtain a viscous suspension of the present invention. In actual disease control, this suspension is thoroughly shaken, diluted 500 to 800 times with water, and sprayed onto plants using an appropriate spraying device.

Claims (1)

[Claims] 1 Highly refined machine oil with a sulfonation value of 10 or less and 1.
1. An agricultural and horticultural fungicidal composition comprising 2-bis(3-methoxycarbonyl-2-thioureido)benzene.