Resistance Research and Geographical Distribution of Botryosphaeria dothidea from Apple to Carbendazim

Sensitivity of Botryosphaeria dothidea to carbendazim was determined by measuring mycelial growth in fungicide-amended media.Most of isolates presented sensitivity to carbendazim.The mean EC50 of(0.2582 ± 0.1208)mg/L for sensitive isolates was made as sensitivity baseline.11 low-resistance isolates to carbendazim were found in 99 isolates collected from 2007 to 2008 in Shandong province,which resistance index was 2～4 times and mainly distributed throughout the western area of the province.