9种杀菌剂对玉米弯孢霉室内毒力和田间药效试验

采用生长速率法测定了9种有机杀菌剂对玉米新月弯孢霉菌的毒力,并进行了极强毒力杀菌剂的混配试验。结果表明:烯唑醇和扑海因对玉米弯孢霉具有极强毒力,回归曲线的相关系数和EC50值分别为0.973和1.4048E+1和0.965、2.2172E+1。烯唑醇和扑海因以5∶5比例混配不仅表现为强增效作用(共毒系数为147),而且对玉米新月弯孢霉菌丝生长抑制作用最强,菌丝生长相对抑制率为32.30%。利用这两个混配组合进行田间药效试验。结果显示:烯唑醇与扑海因以5:5混配,田间相对防效明显高于两单剂及目前生产中常用于防治玉米弯孢霉叶斑病的百菌清。

Studies on Toxicity in Lab and Field Control Effect of 9 kinds of Fungicides against Curulaia lunlata.

The toxicity of 9 kinds of organic fungicides against Curvularia lunata was measured in laboratory by the growth rate method. And the biggest toxicity fungicides were filtrated with some mixed experiment. The results showed that Diniconazole and Iprodione were of stronger inhibitory effect to Curulaia lunlata. And their correlation coefficient of regression curve and EC50 were 0.973,0.965 and 1.4048 E 1,2.2172E 1 respectively. And the results of experiment of co-toxicities of Diniconazole and Iprodione in 5:5 (V:V) showed that it was not only putted up more synergistic effect but also it's inhibitory ratios were the biggest to Curvularia lunata. It's co-toxicity coefficient and relative inhibited ratio were 147 and 32.30 % respectively. And the field control effect showed that it was higher markedly than the two kinds of single fungicides and Clorothalonil,which was usually used to control Curulaia lunlata in the practice at present.