Abstract For investigating the development situation of Botrytis cinerea resistance to different types of fungicides,85 isolates obtained from vegetables in North China were tested for their sensitivity to benzimidazoles (carbendazim),dicarboximides(procymidone),N-phenylanilines(diethofencarb),anilinopyrimidines (pyrimethanil),amides( boscalid) and phenylpyrroles(fludioxonil). The results revealed that Botrytis cinerea in North China have developed different levels of resistance to 6 different types of fungicides,and the resistances to common fungicides including pyrimethanil,boscalid and fludioxonil were spread quickly in managing the grey mold. At the same time,Botrytis cinerea had generated a high level of resistance to carbendazim,procymidone,diethofencarb and the total resistance frequency were 72.94%,51.76%,69.41%,respectively. The frequency of double resistance to carbendazim and diethofencarb was 51.76%,whereas triple-resistance to carbendazim,procymidone and diethofencarb was 34.12%. Moreover,high resistance level was also detected in the tested Botrytis cinerea to pyrimethanil and boscalid,2 common fungicides for controlling gray mold,with resistant frequency 64.71% and 65.88%,respectively. Resistant frequency to the new fungicides fludioxonil was 36.47%. Forty multiple-resistance type were found in this research,and 32 types have not been reported yet. One strain that was sensitive to the tested 6 fungicides was reported,with frequency of 1.18%,while 5 strains resistant to the 6 fungicides were verified,with frequency of 5.88%. We suggest that long-term repeated use of a single fungicide should be avoided in controlling grey mold,and application of multiple agents should be recommended so as to prolong the service life of fungicide.
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