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Inhibiting Effects of Mushroom Extracts by Different Solvents on Tobacco Pathogens

The inhibiting effects of mushroom extracts by different solvents on three kinds of plant pathogens,Pythium diclinum Tokunaga in Ito Tokunaga,Phytophthora parasitica var. nicotianae and Ralstonia solanacearum in tobacco were studied by filter paper disc method and the tube double dilution method. The results showed that 10 different edible mushroom extracts obtained by 4 different organic solvents including ethanol,acetone,diethyl ether,trichloromethane had no certain inhibiting effects on Pythium diclinum Tokunaga in Ito Tokunaga,Phytophthora parasitica var. nicotianae in tobacco,while the inhibiting effects on Ralstonia solanacearum in tobacco were different significantly. The minimal inhibitory concentrations(MIC) of extracts on Ralstonia solanacearum ranged form 0.03 mg·m L-1to 7.63 mg·m L-1. Antibacterial activity was in this order: trichloromethane extractethanol extractdiethyl ether extract≥acetone extract.