Non-target effect of ethiprole 10 SC to predators of rice planthoppers.

摘要

Studies were conducted to evaluate the safety of ethiprole 10 SC to predators of rice planthoppers in Tamil Nadu Agricultural University, Coimbatore. Ethiprole 10 SC at three doses along with imidacloprid 200 SL, thiamethoxam 25 WG and acephate 76 SP were tested in field condition for its effect on nontarget organisms viz., insect predators, Cyrtorrhinus lividipennis and Paederus fuscipes found in rice ecosystem. Ethiprole 10 SC at 25 g a.i. ha-1 was found to be the least toxic to C. lividipennis and recorded relatively more predators in treated plots. Acephate 76 SP at 468.75 g a.i. ha-1 and ethiprole 10 SC at higher dose of 50 g a.i. ha-1 were more toxic to C. lividipennis and P. fuscipes. Thiamethoxam 25 WG at 25 g a.i. ha-1 and ethiprole 10 SC at 37.5 g a.i. ha-1 were at par with regard to toxicity. Among the treatments tried, imidacloprid 200 SL at 25 g a.i. ha-1 was relatively least toxic to C. lividipennis and P. fuscipes. All the treatments registered their effect on predators up to 10th day of insecticide application.