JPH0232242B2 - FURANBYOBOJOZAI - Google Patents

Description

[Detailed description of the invention]

B. Object of the Invention [Field of Industrial Application] The present invention relates to a control agent for a plant rot-causing fungus (VaIsa mali) using hinokitiol. The chemical structural formula of hinokitiol is shown below. [Prior art] Conventionally, drugs such as Topudin hydrating powder, Benlate hydrating powder, and Befuran solution have been used, but there is a drawback that there is no suitable drug that directly acts on the fungus that causes rot disease by simply disinfecting. Ta. Another disadvantage is that the affected area must be scraped off, or if the damage is extensive, it must be cut down and then incinerated. In addition, chemical treatment during the germination period has the disadvantage of causing chemical damage. Furthermore, since the above-mentioned drugs are synthetic chemicals that do not exist in nature and are designated as poisonous or deleterious substances, they have the disadvantage of causing environmental pollution such as soil and groundwater. B. Structure of the Invention [Means for Solving the Problems] Therefore, the present invention takes these drawbacks into consideration and uses the high antibacterial activity of hinokitiol to treat plant rot diseases inexpensively and easily, and without causing environmental pollution. The aim is to provide a pest control agent. [Effect] When natural and synthetic hinokitiol were used to conduct an antibacterial test against a rot-causing fungus (Valsa mali) using the minimum inhibitory concentration method (MIC method), the concentration was 25.0 μg/ml as shown in Table 1. It has become clear that the growth can be completely inhibited. [Examples] Examples of the invention will be shown below. Example (1) 1 part hinokitiol in 30% ethanol aqueous solution99
This is used as a stock solution. To use, dilute this stock solution 400 times with water and apply or spray it on the lesion and the area around it that has been excised. Example (2) Dissolve 1 g of hinokitiol in 100 ml of ethanol and adsorb it onto 1000 cm ³ of zeolite, activated carbon or cristobalite powder. When used, 150 parts of a 24% paraffin preparation is mixed with 1 part of the drug. Example (3) 1 kg of Aomori Hiba sawdust (containing 0.02% hinokitiol) was mixed with the stock solution of Example (1) and vinyl acetate emulsion at a weight ratio of 1:10.
Mix 100g and apply to the affected area and surrounding area that has been excised. Example (4) Dissolve 0.05 g of hinokitiol in 5 ml of ethanol and then mix with 1000 ml of machine oil emulsion. Apply this to the area where the lesion and surrounding areas have been excised. C. Effects of the invention As described above, as a result of conducting experiments according to the examples, remarkable effects were observed as shown in Table 2. Hinokitiol, the main component of this drug, is a natural substance and has extremely low toxicity to living organisms.
Moreover, it has the feature of being easy to use. In addition, since the MIC value against rot fungi is particularly low, a small amount can have a great effect. Furthermore, since there are currently no effective drugs against rot diseases, they are mainly poisonous.

[Table] -: No growth +: Growth

[Table] Rot-causing fungi Effect Effect Effect Effect Lesion area Yes Yes Yes Yes

Claims (1)

[Claims] 1. A rot disease control agent characterized by containing hinokitiol (β-thujaplicin) as an active ingredient.