| 摘要 |
PURPOSE:To provide a safe and pollution-free plant blight controlling agent exhibiting remarkable effect to various plant blights such as melanose, scab and canker of citrus, anthracnose of cucumber, etc. without causing environmental pollution, by using 6,7-dimethoxycoumarin as an active component. CONSTITUTION:6,7-Dimethoxycoumarin of formula is used as an active component. The above active compound is applied directly or in an arbitrary form such as granules, powder, emulsifiable concentrate, etc. by using proper solid carrier, liquid carrier, emulsifying and dispersing agent, etc. The amount of the active component in the agent is preferably about 10-90% for emulsifiable concentrate, wettable powder, etc., and about 0.1-10% for powder, oil solution, etc. The above active component can be prepared by (1) grinding the citrus fruit peel inoculated with the blight of melanose, (2) extracting with acetone and filtering the extract, (3) removing acetone from the filtrate, (4) dispersing the extract in distilled water, and (5) adsorbing with active carbon followed by elution and fractionation.
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