Abstract:

Screening and management of high performance chemical fungicide was the important way to control wheat disease caused by Bipolaris sorokiniana. Suitable fungicide used in the field could be sreened by virulence testing in laboratory. The inhibition of 6 kinds of fungicides on B. sorokiniana, the phynotype of wheat root rot, was studied using biometric methods in this study. The results showed that different fungicides on colony growth was different, in which Difenoconazole was the most effective one to the pathogen, 94.9% inhibition rate was obtained when the concentration was 40 mg/L. Metiram, Propineb, Thiram, Carbendazim and Mancozeb were effective in turn, with the inhibition rate of 89.5%, 86.3%, 48.2%, 40% and 37.8%, respectively. Strong inhibition of spore germination was also displayed with Difenoconazole, hemi-inhibitory concentration was 6.45 mg/L, showed that this agent can be used in production continuously.