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１９９５～１９９７年以５μｇ／ｍＬ为检测标准，对通州地区油菜菌核病进行了室内监测和田间试验，结果表明，油菜菌核病已在大范围内对多菌灵产生抗性，导致防效显著下降，其中抗性比例最高达１００％，与１９９６年相比，１９９７年产生的抗性范围进一步扩大，抗性比例升高２４．８３个百分点，防效只有３０．４２％。本文将油菜菌核病对多菌灵的抗性标准划分为：低抗，ＥＣ５０为１～１０μｇ／ｍＬ；中抗，ＥＣ５０为１０～１００μｇ／ｍＬ；高抗，ＥＣ５０＞１００μｇ／ｍＬ；离体和活性抗性程度测定表明，其抗性菌株皆为高抗菌株，ＥＣ５０＞１００μｇ／ｍＬ，ＭＩＣ（最小抑制浓度）＞１０００μｇ／ｍＬ。对苯菌灵、噻菌灵、甲基硫菌灵表现为正交互抗性，对乙霉威表现为负交互抗性。
From 1995 to 1997 with 5μg / mL as the detection standard, we conducted indoor monitoring and field experiment on sclerotinia sclerotiorum in Tongzhou region. The results showed that Sclerotinia sclerotiorum had resistance to carbendazim in a wide range, Compared with 1996, the range of resistance developed in 1997 further expanded. The proportion of resistance increased by 24.83 percentage points, and the control effect was only 30.42%. The resistance to carbendazim in rapeseed is divided into: low resistance, EC50 of 1 ~ 10μg / mL; medium resistance, EC50 of 10 ~ 100μg / mL; high resistance, EC50> 100μg / mL; The results showed that the resistant strains were all highly antibacterial strains with EC50> 100μg / mL and MIC (minimum inhibitory concentration)> 1000μg / mL. For benomyl, thiabendazole, thiophanate-methyl showed orthogonal cross resistance, showed negative cross resistance to diethofencarb.