四地区小麦纹枯病菌对6种杀菌剂的抗性比较

从山东和江苏的4个小麦产区采集分离了5个小麦纹枯病菌Rhizoctonia cerealis菌株，为明确小麦纹枯病菌对不同杀菌剂的抗性现状，采用生长速率法测定了5个小麦纹枯病菌菌株对三唑酮、井冈霉素、戊唑醇、咯菌腈、丙环唑、苯醚甲环唑6种常用杀菌剂的抗性。结果表明：江苏镇江菌株（JZ）对三唑酮和井冈霉素的抗性分别高达20．46和23．31倍，山东聊城2个菌株（L1和L2）和泰安菌株（TA）对三唑酮的抗性分别为14．26、10．10和11．98倍，滕州菌株（聊）和泰安菌株（TA）对井冈霉素的抗性分别为14．92和10．46倍。5个菌株对戊唑醇、咯菌腈、丙环唑和苯醚甲环唑抗性均不明显，其中戊唑醇对小麦纹枯病的防治效果最好。

Susceptibility of Rhizoctonia cerealis to six fungicides in four wheat areas

Five colonies of Rhizoctonia cerealis were isolated from Shandong and Jiangsu Provinces. For confirming the resistance actuality of Rhizoctonia cerealis to different fungicides susceptibility of 5 colonies of Rhizoctonia cerealis to six fungicides including triadimefon, validamycin, tebuconazole, fludioxonil, propiconazole and difenoconazole were measured by using mycelium growth rate method. The results showed that the resistance factor to triadimefon and validamycin in Jiangsu Zhenjiang (JZ) colony was 20.46-fold and 23.31-fold, respectively, the resistance factors to triadimefon in Shandong Liaocheng (L1 and L2) colonies and Tai'an (TA) colony was 14.26-fold, 10.10-fold and 11.98-fold, and the resistance factor to validamycin in colonies from Tengzhou (TW) and Tai'an (TA) was 14.92-fold and 10.46-fold. The 5 colonies are still susceptible to tebuconazole, fludioxonil, propiconazole and difenoconazole. The controlling effect of tebuconazole is the best.