Study on the Anti-fungi Activity of the Extract from Three Kinds of Chinese Herb.

Three kinds of Chinese herbs,including Syzygium aromaticum,Polygonum cuspidatum and Stemona sessilifolia,were used as the experiment materials to determine their inhibitory activity against 8 plant pathogens.The results showed that the extracts of Syzygium aromaticum had 100% inhibiting rate to all 8 kinds of plant pathogens,the extracts of Polygonum cuspidatum also showed good anti-fungal properties with more than 70% inhibiting rate to at least 6 kinds of plant pathogens and the highest inhibiting rate achieving at 100% against the Valsa mali.The inhibiting rate of the extracts of Syzygium aromaticum to the growth of the spore of Dothiorella gregaria reached 100% at the concentration of 0.1 g/ml,while that of the Polygonum cuspidatum extracts was 94%.