Combined Toxicity Test of Complex Agents of Metalaxyl and Other Fungicides against Phytophthora parasitica var. nicotianae  

甲霜灵与其他杀菌剂复配对烟草黑胫病菌联合毒力测定(英文)

作　　者：刘铭[1,2] 

机构地区：[1]西昌学院农学系,四川西昌615013 [2]四川农业大学研究生院,四川雅安625014

出　　处：《Plant Diseases and Pests》2011年第2期58-60,63,共4页植物病虫害研究（英文版）

基　　金：Supported by Key Project of Sichuan Education Department "Study on Physiological Race of Tobacco Black Shank in Liangshan and Resistance Evaluation of Tobacco Germplasm Resources in Sichuan Province"(08ZA032)~~

摘　　要：[ Objective] To overcome the resistance of Phytophthora parasitica var. nicotianae against metalaxyl and effectively control its damage, new efficient complex agent of metalaxyl was studied and developed. [ Method] The toxieities of nine fungicides against P. parasitica were measured using growth rate method. On this basis, the fungicides with good effects were selected to compound with metalaxyl, and the optimum complex ratio was confirmed. [Result] The toxicity of metalaxyl was the strongest with EC50 of 2. 130 5μg/ml; followed by carbendazim, mancezeb and dimethomorph with EC50 of 2.357 9, 2.639 8 and 2. 778 8 μg/ml. The effect of cyazofamid was the poorest with EC50 of 6. 278 8 μg/ml. The optimum complex ratios of dimethomorph, carbendazim and mancezeb with metalaxyl were 40： 60, 30：70 and 20： 80, and their co-toxicity coefficients were 138.80,124.25 and 115.00, respectively. [ Conclusion] The complex agents had application and promotion value, which could be used to carry out further field trials.[ Objective] To overcome the resistance of Phytophthora parasitica var. nicotianae against metalaxyl and effectively control its damage, new efficient complex agent of metalaxyl was studied and developed. [ Method] The toxieities of nine fungicides against P. parasitica were measured using growth rate method. On this basis, the fungicides with good effects were selected to compound with metalaxyl, and the optimum complex ratio was confirmed. [Result] The toxicity of metalaxyl was the strongest with EC50 of 2. 130 5μg/ml; followed by carbendazim, mancezeb and dimethomorph with EC50 of 2.357 9, 2.639 8 and 2. 778 8 μg/ml. The effect of cyazofamid was the poorest with EC50 of 6. 278 8 μg/ml. The optimum complex ratios of dimethomorph, carbendazim and mancezeb with metalaxyl were 40： 60, 30：70 and 20： 80, and their co-toxicity coefficients were 138.80,124.25 and 115.00, respectively. [ Conclusion] The complex agents had application and promotion value, which could be used to carry out further field trials.

关 键 词：Phytophthora parasitica vat. nicotianae METALAXYL COMPLEX TOXICITY 

分 类 号：S435.72[农业科学—农业昆虫与害虫防治]