12种杀菌剂对辣椒疫霉菌的室内毒力比较

Laboratory toxicity tests of twelve kinds of fungicides to Phytophthora capsici

采用生长速率法和孢子囊形成法测定了常用的12种杀菌剂对辣椒疫霉菌的毒力.试验结果表明,供试杀菌剂对辣椒疫霉菌菌丝生长、孢子囊形成的抑制作用间存在明显差异,其中以50%安克和68%精甲霜锰锌的对菌丝抑制作用相对较强,它们对菌丝生长的毒力回归方程分别为y=4.434 6+0.759 8x和y=4.569 7+0.522 6x,抑制中浓度分别为5.55μg/mL和6.66μg/mL;而50%安克和72.2%霜霉威对孢子囊形成的抑制作用相对较强,毒力回归方程分别为y=2.393 3+1.304 9x和y=2.269 5+1.303 6x,抑制中浓度分别为99.45μg/mL和124.34μg/mL.其它供试杀菌剂的毒力效果均不太理想.

Laboratory toxicity tests of twelve fungicides to Phytophthora capsici were carried out using the methods of mycelium growth and sporangium formation. The results showed that the effects of these fungicides were significantly different in inhibiting the growth of myeelium and the formation of sporangium of P. capsici. Among all these fungicides tested, the inhibitive effect of 50% dimethomorph WP and 68 % M-metalaxyl MZ were better than other fungicides to the growth of myeelium. The inhibition rate equation to the myeelium growth respectively were as;y=4.434 6＋0.759 8x and y=2.393＋1.304 9x,and the value of EC50 were 5.55 g/mL and 6.66 g/mL respectively. The inhibition to the sporangium formation of 50% dimethomorph WP and 72.2% propamoearb were better than other fungicides. The inhibition rate equation respectively were as.y：2. 393 3＋1.304 9x and y=2. 269 5＋1. 303 6x,and the value of EC50 were 99.45 g/mL and 124. 34 g/mL respectively.