Abstract:

The objective of this study were to to clarify the synergistic effects of mixed Prochloraz and hymexazol to Fusarium moniliforme, Rhizoctonia solani and to find the best mixed ratio of two preparations. The Prochloraz and hymexazol and their mixtures-made up by mixing the two pesticides in five different ratios, on Fusarium moniliforme and Rhizoctonia solani were tested by mycelial growth rate method. To Fusarium moniliforme, EC50 of Prochloraz, Hymexazol, the mixed ratio of two preparations1:1, 1:2, 1:4, 1:6, 1:8 were different, 0.0197, 69.492, 0.021, 0.028, 0.082, 0.163, 0.215 mg/L for each. To Rhizoctonia solani, EC50 of each was 0.247, 25.140, 0.444, 0.469, 1.041, 1.495, 2.012 mg/L. For Fusarium moniliforme, the efficiency coefficient of 5 kinds of mixed ratio of two preparations (SR) were 1.85, 2.14, 1.20, 0.84, 0.82, For Rhizoctonia solani the efficiency coefficient of each was 1.10, 1.55, 1.14, 1.09, 1.02. Prochloraz were higher than Hymexazol on the virulence of 2 bacteria. Prochloraz mixed with hymexazol in 1:2 had significant synergism to Fusarium moniliforme and Rhizoctonia solani than used alone.