Estimation of Fungicide-resistance and Fitness of Botrytis cinerea

Monitoring of fungicide resistance in Botrytis cinerea was carried out in the suburbs of Beijing,Shenyang and Baoding.The results showed that the percentages of resistant strains to carbendazim and diethofencarb were 74.67% and 25.82%,respectively.There were also three double resistant strains.Fitness of Botrytis cinerea was examined in vitro and in vivo .The results suggested that there was no obvious difference in mycelial growth rate,spore production capacity and pathogenicity of three types of strains of Botrytis cinerea.