防治肿节风黑线炭疽病菌的药剂筛选

采用菌丝生长速率测定法测定14种杀菌剂的抑制活性,对抑制率达90%以上的杀菌剂进行毒力测定,根据室内测试结果将抑制效果较好的杀菌剂进行田间防治试验。结果表明:戊唑醇、苯醚·咪鲜胺、咪鲜胺、苯醚甲环唑4种药剂对黑线炭疽病菌具有较好抑菌活性,抑制率90%,EC50分别为0.079 9,3.567,55.470,370.340 mg·L-1;戊唑醇稀释3 000~4 000倍,苯醚·咪鲜胺稀释1 000~2 000倍,田间防效均达70%以上。这表明戊唑醇、苯醚·咪鲜胺对肿节风炭疽病有较好的防治作用,可以在生产上推广应用。

Screening of Efficient Fungicides Against the Anthracnose of Sarcandra glabra Caused by Colletotrichum dematium

Antimicrobial activities of 14 fungicides were tested against Colletotrichum dematium by using the mycelia growth rate method,and the fungicides with an inhibition rate of 90% or more were tested in toxicity indoor and then in the field.Four fungicides,ie.Tebuconazole,flusilazole-prochloraz chloride complex,Prochloraz,Difenoconazole gave high antimicrobial effects,and their EC5o values were 0.799,3.567,55.47 and 370.34 mg · L^-1,respectively.The field tests showed that Tebuconazole and flusilazole-prochloraz had a control efficacy of 〉 70% against the anthracnose of Sarcandra glabra when diluted at 1：30004000 and 1：1000-2000,respectively,indicating that these two fungicides have a better control efficacy against the anthracnose of Sarcandra glabra caused by Colletotrichum dematium,and can be released for commercial extension to control this disease.