Abstract

Determination of median lethal concentration values for different insecticides to various instars of Lyrosa pseudounnaleta Bocs. et Str.showed the safety of ethofenprox to all the immature stages and adults of L. pseudonnulata. Chlorpyriphos. BPMC. phosphamidon and monocrotophos had comparatively higher LCsa values than accphate. Determination of median lethal concentration values for different insecticides to Oxyopes javanus Thorell and Argiope catenulater (Doleschall) revealed that BPMC. chlorpyriphos, acephate and ethofenprox had higher LC values to 0. javnus and Acatenulata than phosphamidon and monocrotophos which were comparatively more toxic.

Keywords: Toxicity, insecticides, spiders, Lycosa pseudoannulata, Oxyopes javanus, Argiope catenulata, rice field