多种药剂对甘薯黑斑病菌的毒力测定及其对苗期黑斑病的防治效果研究

Toxicity of Several Fungicides to Ceratocystis fimbriata and Their Control Effects on Black Spot of Sweet Potato Seedlings

采用菌丝生长速率法在室内测定了6种杀菌剂对甘薯黑斑病菌(Ceratocystis fimbriata Ellis et Halsted)的毒力,结果表明,1%枯草芽孢杆菌可湿性粉剂和2%宁南霉素对甘薯黑斑病菌菌丝生长的抑制效果居前2位,其中后者对该病菌的EC50值为0.30μg/mL。探讨了7种药剂对甘薯苗期黑斑病的防治效果,结果显示:以50%甲基托布津可湿性粉剂800倍液对苗期黑斑病的防治效果最佳,防效达100%。

The indoor toxicities of six fungicides to Ceratocystis fimbriata Ellis et Halsted were tested by using mycelial growth rate method.The results showed that：among the tested 6 fungicides, 1%Bacillus subtilis WP and 2%Ningnanmycin had the top 2 inhibitory effect on the mycelial growth of Ceratocystis fimbriata, and the EC50 value of the latter against this pathogen was 0.30μg/mL.The control effects of 7 kinds of fungicides on the black spot of sweet potato seedlings were studied.The results indicated that the 800-times dilution of 50%Topsin-methyl WP had the best control effect on this disease of sweet potato at seedling stage , and its control effect reached 100%.