Dynamics of resistant population of Fusarium graminearum to carbendazim and substitutable fungicide screening

A total of 19 491 isolates of Fusarium graminearum causing wheat scab were collected from 13 counties in Shanghai and Zhejiang, Jiangsu, and Hubei provinces during 1986 to 2001 and tested for carbendazim (MBC) resistance. In the resistance bioassay, the distinctive concentration for resistance and sensitivity is 10 μ·mL~(-1) of MBC. The results showed that the resistant population with high de-gree of MBC-resistance of F. graminearum has developed in Shanghai and Zhejiang, Jiangsu provinces, and no resistant isolate was found in Hubei. Efficiency tebuconazole, diniconazole, prochloraz and thiram fungicides against MBC-resistance of the pathogenic population was determined both in vitro and in vivo. Tebuconazole and prochloraz were best to combat the MBC resistant and sensitive populations. Therefore, these two fungicides were suggested to be used as a alternation to control the development of the MBC-resistance in F. graminearum.