Abstract:

In order to clarify the synergistic effects of mixed JS399-19 and Hexaconazole to Fusarium graminearum and to find the best mixed ratio of two preparations, the JS399-19 and Hexaconazole and their mixtures-made up by mixing the two pesticides in six different ratios, on Fusarium graminearum were tested by mycelial growth rate method. Experimental results demonstrated that EC50 of JS399-19, Hexaconazole, and their six different ratios were 0.393 mg/L, 0.643 mg/L, 0.571 mg/L, 0.338 mg/L, 0.369 mg/L, 0.513 mg/L, 0.577 mg/L, 0.726 mg/L. The efficiency coefficients of the six different ratios were 0.85, 1.64, 1.58, 1.16, 1.05, 0.84. The indoor biological activity to Fusarium graminearum of JS399-19 was higher than Hexaconazole. The mixed ratio of two preparation 1:3 and 1:5 to Fusarium graminearum have synergistic effects.