Selvaraj K, Ramesh V, Gotyal B S, Satpathy S
J Environ Biol. 2015 Nov;36(6):1409-14.
Toxicity of conventional (profenofos 50 EC and λ-cyhalothrin 5 EC) and non-conventional (flubendiamide 480 SC, chlorantraniliprole 18.5 SC, emamectin benzoate 5 SG) insecticides was determined on the basis of median lethal concentration (LC50) values on third instar larvae of jute hairy caterpillar, Spilarctia obliqua under laboratory conditions. Further, the promising binary insecticides combinations with lesser LC50 values and adequate synergistic activity were evaluated under field conditions. The LC50 values calculated for insecticides viz., chlorantraniliprole, flubendiamide emamectin benzoate, λ-cyhalothrin and profenophos were 0.212, 0.232, 0.511, 0.985 and 3.263 ppm, respectively. Likewise, the LC50 values for flubendiamide with λ-cyhalothrin in 3:1 proportion was most toxic (0.103 ppm) amongst all the other binary combinations with λ-cyhalothrin. Chlorantraniliprole in combination with λ-cyhalothrin at 1:1 proportion (0.209 ppm) was most toxic followed by 3:1 proportion (0.345 ppm). Similarly, emamectin benzoate in combination with λ-cyhalothrin at 1:1 proportion was more toxic (0.271 ppm) than 3:1 ratio (0.333 ppm). Toxicity index of flubendiamide + λ-cyhalothrin (3:1 ratio) was highest (970.87). Bioefficacy of synergistic binary combinations along with individual insecticides established the superiority of profenophos + λ-cyhalothrin (3:1) with 89.12% reduction in infestation and recorded maximum fibre yield 38.67qha' under field condition. Moreover, combination of diverse insecticides group might sustain toxicity against the target insect for longer period with least probability of resistance development.
在实验室条件下，基于黄麻毒蛾三龄幼虫的半数致死浓度（LC50）值，测定了常规杀虫剂（丙溴磷50乳油和高效氯氟氰菊酯5乳油）和非常规杀虫剂（氟苯虫酰胺480悬浮剂、氯虫苯甲酰胺18.5悬浮剂、甲氨基阿维菌素苯甲酸盐5可湿性粉剂）的毒性。此外，在田间条件下评估了具有较低LC50值和足够协同活性的有前景的二元杀虫剂组合。计算得出的杀虫剂氯虫苯甲酰胺、氟苯虫酰胺、甲氨基阿维菌素苯甲酸盐、高效氯氟氰菊酯和丙溴磷的LC50值分别为0.212、0.232、0.511、0.985和3.263 ppm。同样，在所有与高效氯氟氰菊酯的其他二元组合中，氟苯虫酰胺与高效氯氟氰菊酯按3:1比例混合时毒性最大（0.103 ppm）。氯虫苯甲酰胺与高效氯氟氰菊酯按1:1比例混合（0.209 ppm）毒性最大，其次是3:1比例（0.345 ppm）。同样，甲氨基阿维菌素苯甲酸盐与高效氯氟氰菊酯按1:1比例混合比3:1比例毒性更大（0.271 ppm对0.333 ppm）。氟苯虫酰胺 + 高效氯氟氰菊酯（3:1比例）的毒性指数最高（970.87）。协同二元组合以及单一杀虫剂的生物活性表明，丙溴磷 + 高效氯氟氰菊酯（3:1）具有优势，在田间条件下虫害减少89.12%，纤维产量最高达到38.67公担/公顷。此外，不同杀虫剂组的组合可能对目标昆虫保持较长时间的毒性，且抗性发展的可能性最小。
