Comparative toxicity of synthetic insecticides against Anomala rugosa (Coleoptera: Scarabaeidae: Rutelinae)
Nutan, Amit Paschapur, Johnson Stanley, Ila Bisht, Jai Prakash Gupta
The efficacy of 21 insecticides was tested against Anomala rugosa under laboratory conditions in June-July, 2021. To evaluate the efficacy of insecticides, two methodologies viz., leaf dip bioassay and contact toxicity bioassay were carried out. Overall, the tested species showed substantial variation in susceptibility to the tested chemical insecticides with mortality of beetles ranging from 0 to 100 %. Chlorpyriphos 20% EC @ 2 mL/L was proved to be the most potent insecticide in terms of toxicity. The tested species recorded percent mortality of 100.00±0.00 in treatment with chlorpyriphos at 24 HAT in both leaf dip as well as contact toxicity bioassay. The second most potent insecticide was Dichlorvos 76% EC @ 1 mL/L, it recorded percent mortality of 96.67±3.33 and 100.00±0.00 at 24 HAT and 48 HAT, respectively in leaf dip bioassay. In contact toxicity bioassay, it recorded percent mortality of 90.00±5.77 and 100.00±0.00 at 24 HAT and 48 HAT, respectively. Besides these, the treatment with Acephate 75% SP (90.00±5.77), Cypermethrin 25% EC @ 0.5 mL/L (60.00±10.00), Deltamethrin 2.8% EC @ 1 mL/L (53.33±3.33), Lambda-cyhalothrin 5% EC (90±5.77) and Malathion 50% EC @ 2 mL/L (83.33±3.33) provided high mortality of Anomala rugosa in leaf dip bioassays at 48 HAT. But, they did not yield a promising rate of efficacy in contact toxicity bioassay. The treatment with Acetamiprid 20% SP, Azadirachtin 0.15% EC, Buprofezin 25% SC, Cartap hydrochloride 50% SP, Chlorantraniliprole 18.5% SCL, Chlorfenapyr 10% SC, Cyantraniliprole 10.26% OD, Emamectin benzoate 5% SG, Fipronil 5% SC, Flubendiamide 39.35% SC, Imidacloprid 17.8% SL, Indoxacarb 14.5% SC, Metasystox 25% EC and Spinosad 45% SC did not report a promising rate of efficacy in both bioassays. Thus, our study created a species-specific and scientific base for scarab beetle (Anomala rugosa) management using efficacious insecticides.
Nutan, Amit Paschapur, Johnson Stanley, Ila Bisht, Jai Prakash Gupta. Comparative toxicity of synthetic insecticides against Anomala rugosa (Coleoptera: Scarabaeidae: Rutelinae). International Journal of Entomology Research, Volume 7, Issue 5, 2022, Pages 183-189