杀菌剂复配对水稻纹枯病的联合毒力

Combined Toxicity of Bactericide and Their Combination on Rice Sheath Blight

采用生长速率法测定了丙硫唑、噻呋酰胺、氟环唑及苯醚甲环唑对水稻纹枯病的毒力。结果表明,丙硫唑和氟环唑对水稻纹枯病的活性较高,EC50分别为0.228 1、0.290 4 mg/L;其次是噻呋酰胺,EC50为0.624 6 mg/L;苯醚甲环唑活性最差,EC50为4.404 6 mg/L。选择丙硫唑和噻呋酰胺6种配比(5∶1、3∶1、1∶1、1∶3、1∶5、1∶7)测定其对水稻纹枯病菌的联合毒力,其共毒系数分别为124.96、164.91、193.19、224.93、226.61、274.09,表明两种药剂间的联合毒力具有增效作用,其中以有效成分质量比为1∶7时,增效最为显著。

The toxicity of virulence albendazole, thifluzamide, epoxiconazole and difenoconazole on rice sheath blight was determined by growth rate method. The results showed that albendazole and epoxiconazole on rice sheath blight with higher toxicity,EC50 was 0.228 1,0.290 4 mg / L respectively; The second was thifluzamide,EC50 was 0.624 6 mg / L; Difenoconazole toxicity was worst, the EC50 was 4.404 6 mg / L. Select albendazole and thifluzamide 6 ratio（5 ∶1,3 ∶1,1 ∶1,1 ∶3,1 ∶5,1 ∶7） to determine the combined toxicity to rice sheath blight, the co-toxicity coefficient CTC values were 124.96,164.91,193.19,224.93,226.61,274.09,which showed that two kinds of combined toxicity among medicaments with synergistic action, which the effective components of the mass ratio of 1∶7 with the most significant synergism.