Insecticidal effect of three IGRS, diflubenzuron, precocene (ii) and rakshak against Papilio demoleus (Linn.)

Abstract

A laboratory bioassay was carried out to determine the LC50 and relative toxicity of three insect growth regulators viz., Diflubenzuron (dimlin), Precocene II and Rakshak (azadirachtin) to control on the citrus butterfly Papilio demoleus. The bioassays studies revealed that Diflubenzuron showed the maximum efficacy (LC50= 0.3456%) followed by Precocene II (LC50= 0.5832%) and Rakshak (LC50= 0.7525%). In terms of LC50 values the order of toxicity was Diflubenzuron ˃ Precocene II ˃ Rakshak. The order of relative toxicity was observed as Diflubenzuron (LC50= 1.687) ˃ Precocene II (LC50= 1.000) ˃ Rakshak (LC50= 0.775).