Determination for Toxicity of Six Fungicides to Fusarium Wilt Pathogen of Potato in vitro

Determination for toxicity of the six fungicides,75% chlorothalonil WP,36% metalaxyl mancozeb SC,70% hymexazole WP,50% thiophanate-methyl WP,6% kasugamycin WP,and 22.5% imazalil EC,was made to Fusarium wilt pathogen of potato in vitro.The results indicated that there was significant difference in inhibiting efficacy on the mycelial growth of the six fungicides for three pathogenic Fusarium wilt pathogens,Fusarium oxysporum,F.solani and F.tricinctum.Inhibition efficacy of 50% thiophanate-methyl WP and 22.5% imazalil EC to the three Fusarium wilt pathogens was best,with EC50 being 1.69,5.59 and 5.03 μg/mL,and 3.60,5.17 and 1.58 μg/mL,respectively.