禾谷镰孢菌对杀菌剂戊唑醇敏感基线的建立

Sensitive Baseline of Fusarium graminearum to Tebuconazole

【目的】研究禾谷镰孢菌（Fusarium graminearum）对三唑类杀菌剂戊唑醇的敏感性，以期为该病的综合治理提供科学依据。【方法】采用菌丝生长速率法测定菌株对戊唑醇的敏感性。【结果】从河北、河南、山东省等主要地区采集和分离获得130个菌株，对戊唑醇的EC50值分布范围为0．0072-0．2880mg／L，平均值为（0．1130±0．0570）mg／L，菌株对戊唑醇的敏感性频率分布呈单峰曲线，平均EC50值可作为菌株对戊唑醇的敏感性基线。【结论】该敏感基线可以作为田间禾谷镰孢菌对戊唑醇抗药性监测敏感性变化的参考。

[Aims] The sensitivities of Fusarium graminearum to triazole fungicides tebuconazole were determined in order to give the basic information for integrated disease management. [Methods] The sensitivities of bacterial strain to tebuconazole were tested by mycelial growth diameter method. [Results] One hundred and thirty isolates were collected from Hebei, Henan, Shandong, et al. The testing results showed that EC50 values of isolates to tebuconazole ranged from 0.0072 to 0.2880 mg/L, and the mean EC50 value was （0.1130±0.0570） mg/L, and the sensitivity frequency of the pathogen displaied an uninodel curve. Hence their mean ECs0 value could be used as the sensitivity baseline for isolates to tebuconazole. [Conclusions] It could be used as the sensitivity baseline of Fusarium graminearum to tebuconazole for monitoring the situation of field resistance dynamic development.