Screening of fungicides and disease-resistant varieties for wheat Fusarium crown rot
To obtain effective fungicide and resistant varieties for the control of wheat Fusarium crown rot(FCR),12 different types of fungicides were selected to test the laboratory virulence against FCR fungi,their effects on wheat growth and the indoor efficacy in the control of wheat FCR.In addition,the resistance of 144 wheat varieties(lines)for resistance to wheat FCR were identified.The results showed that all 12 fungicides showed some inhibitory effect on F.pseudograminearum,among which the highest inhibition rate was 15％phenamacril·5％hexaconazole with the EC50 of 0.002 mg/L,fol-lowed by 6.6％azoxystrobin 1.1％fludioxonil·3.3％metalaxyl-M,25 g/L fludioxonil,and 430 g/Ltebu-conazole with EC50 of 0.016,0.069,and 0.099 mg/L,respectively.Twelve fungicides seed dressing treat-ments had different effects on wheat emergence,plant height,root length,and fresh weight,especially on emergence rate,among which the lowest wheat emergence rate was 30.41％produced by treatment with 15％phenamacril·5％hexaconazole.The indoor potted control effect test showed that the control efficacy of 15％phenamacril.5％hexaconazole was the optimal,70.43％;followed by 430 g/L tebucon-azole and 25 g/L chlorfenapyr·37.5 g/L fenpropathrin,the control efficacy were 56.34％and 53.34％,re-spectively.Among the 144 wheat varieties(lines)tested,only three were moderately susceptible,the other 141 were highly susceptible,there were no immune or resistant varieties.In conclusion,it is sug-gested to use 15％phenamacril·5％hexaconazole for seed dressing treatment,but the dosage of these agents should be strictly controlled to prevent the side-effect on wheat.
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