小麦赤霉病菌对多菌灵和不同杀菌剂敏感性的相关分析

Sensibility Correlation Analysis of Gibberella zeae(Schwein.)Petch to Carbendazim and Other Fungicides

为探明江苏省小麦赤霉病菌[Gibberella zeae(Schwein.)Petch]对多菌灵的抗药性和该药剂与其他杀菌剂的交互抗性,采用区分剂量法检测了采自江苏省26个县(市)的520株小麦赤霉病菌对多菌灵的抗药性,并采用菌丝生长速率法分别检测了对多菌灵不同敏感性的10个菌株对嘧菌酯、吡唑醚菌酯、肟菌酯、唑胺菌酯、氟环唑、己唑醇、灭菌唑和咯菌腈等杀菌剂的敏感性。结果表明:江苏省各县(市)菌株对多菌灵的抗性频率差异较大,总抗性频率为50.58%;通过EC_(50)值相关性分析,小麦赤霉病菌对多菌灵和上述杀菌剂之间不存在交互抗性。江苏省小麦赤霉病菌对多菌灵的抗性频率较高,迫切需要筛选新的杀菌剂防治小麦赤霉病。

In order to investigate the resistance of Gibberella zeae （Schwein.） Petch to carbendazim and the cross resistance to carbendazim and other fungicides, the drug resistance of 520 isolates of G.zeae （Schwein.） Perch collected from 26 counties （cities） in Jiangsu Province were detected by the method of distinguishing dosage method, and then 10 isolates with different sensitivities to carbendazim were used to study the cross resistance to azoxystrobin, pyraclostrobin, trifloxystrobin, pyrametostrobin, epoxiconazole, hexaconazole, triticonazol and fludioxonil by the method of mycelium growth rate method. The results showed that the resistance frequency of G.zeae （Schwein.） Petch of different counties （cities） in Jiangsu was different, and the total resistance frequency was 50.58%; correlation analysis of ECso showed that there was no cross resistance between carbendazim and other fungicides. These results suggested that G.zeae （Schwein.） Petch in Jiangsu had relatively high resistance frequency to carbendazim, and it was urgent to screen new fungicide to control fusarium head blight.