黑龙江稻瘟病菌对三环唑抗药性研究

Tolerance of Rice Blast to Tricyclazole in Heilongjiang Province

采用室内抑菌试验方法，对来自黑龙江省不同地区１６０份稻瘟病标样中的９８个纯菌株进行抗药性测定。结果表明，三环哩对不同地区稻瘟病菌的平均抑制中浓度（ＥＣ５０）有很大差异。敏感菌株的平均抑制中浓度，哈尔滨菌株为１０～２０ｍｇ／ｋｇ，牡丹江菌株为２０～４０ｍｇ／ｋｇ，佳木斯和绥化菌株均接近５０ｍｇ／ｋｇ，国营农场的菌株接近４０ｍｇ／ｋｇ，抗性菌株平均抑制中浓度均大于５０ｍｇ／ｋｇ。本试验结果说明，黑龙江省大部分稻区的稻瘟病菌对三环唑已产生一定的抗性。抗性菌株抑制中浓度大约是敏感菌株的１．２５—５倍。

Investigation of tolarance to Tricyclazole in rice blast (Magnaporthe grisea, Anamorph: Pyricularia grisea) from majorrice cultivation regions of Heilongjiang province in 1995-- 1997 showed that the resistant isolates were found in many areas. The average EC50 of Tricyclazole to sensitive isolates in the regions of Harbin, Mudanjiang, Jiamusi, Suihua and some state farms were 10-- 20mg/kg, 20--40 mg/kg, 50 mg/kg, 50 mg/kg, 40 mg/kg respectively. The average EC50 of resistant isolates were all far surpass 50mg/kg. The average EC50 of resistant isolates to Tricyclazole is about 1. 25--5 times to sensitive ones.