几种新型杀菌剂对瓜类蔓枯病菌的毒力测定

On toxicity of Some New Fungicides to Mycosphaerlla melonis

用生长速率法测定8种药剂对瓜类蔓枯病的抑制作用表明：30％苗菌敌抑制作用最强，40mg／kg抑制率为100％，其次为50％扑海因和5％菌毒清，600mg／kg抑制率分别为914％和837％；用最小二乘法计算的3种药剂的毒力回归方程依次为：Y＝4．2187＋2．1317x、Y＝0．8644＋2．2214x、Y＝3．6955＋0．9434x；EC50为2．3255mg／kg、73．378mg／kg、24．1474mg／kg；EC95为14．342mg／kg．410．964mg／kg。1338．mg／kg为田间进一步试验提供了理论依据。

The my celium growth inhibition rate of & new fungicides was measured to Mycosphaerella melonis in vitro. The results showed that the most effective ftingicide was Miaojundi (40 mg/kg), which inhibited the pathogen by 100 %. Iprodione (600 mg/kg) and Junduqing (600 mg/kg) were the second effective fungicides, which inhibited the pathogen by 91.9 % and 83.7 %, respectively. Toxicity regression equations of the three fungicides were Y=4.21 87+2. 1317x, y=0.8644+2.2214x, and y=3.6955+0.9434x, respectively; EC5o were 2.3255 mg/kg, 73.378 mg/kg, 24.1474 mg/kg; and EC95 were 14.342 mg/kg, 410.964 mg/kg,1338. 108 mg/kg respectively.