Bioactivities of Several Fungicides on Alternaria obpyriformis in the Laboratory

Bioactivities of seven fungicides on Alternaria obpyriformis T.Y. Zhang in the laboratory were studied. The results showed that seven fungicides displayed various inhibition effects on condial germination of Alternaria obpyriformis T.Y. Zhang. The inhibition effects on condial germination of iprodione,prochloraz and pyrimethanil were better than those of flusilazole,mancozeb,chlorothalonil and difenoconazole. The tests on bioactivities of these fungicides on mycelial growth showed that all seven fungicides could obviously inhibit mycelial growth,while prochloraz proved to be the most effective fungicide with the inhibition rate of 84.24% and followed by those of iprodione,flusilazole and difenoconazole.