Abstract:

Screening antifungal actinomycetes are foundation of agricultural antibiotics exploitation. The antifungal activity of six strains actinomycetes from soil were studied by mycelium growth rate, spore germination test. The antifungal activities of different extracts of actinomycete X1 Strain were studied. The results of mycelium growth rate showed that the X1 strain displayed a broad spectrum inhibitory activity to all the tested 12 plant pathogenic fungi, of which, the inhibition rate against three pathogens were 100%, such as Valsa mali, Physalospora piricola and Coniella diplodiella. The results of spore germination test demonstrated that the X1 strain also had an inhibition rate of 100% against germination of spores of Fusarium oxysporum. The inhibition rate to three plant pathogens was over 90% with ethyl acetate of X1 strain at the concentration of 10 mg/mL. The X1 strain displayed a broad spectrum inhibitory activity, which has great potential for controlling plant pathogens.