关键词: 稻瘟病菌, 三环唑, 抗药性, 抗性水平

Abstract: [Objective] This study was aimed to explore the resistance of rice blast to tricyclazole in different regions of Guizhou province. [Method] The resistances of 96 single spore isolations to tricyclazole were tested determined by the rate of hypha growth which came from 8 different regions. [Results] The result showed that the resistance of the isolations to tricyclazole appeared continuous distribution, the maximum and the minimum EC₅₀ were 101.05 μg/ml and 35.16 μg/ml, respectively. The average data of EC₅₀ was between 60.48~71.62 μg/ml;the lowest and the highest resistant level were 0.48 and 1.39, the difference was 2.89 times, the average resistant level was between 0.83~0.99. [Conclusion] The resistance of Pyricularia grisea to tricyclazole have being sensitivity or low level and it is the main medicine to against the rice blast at present.

Key words: Magnapothe grisea, tricyclazole, resiatance, resistant level