Efficacy of indoxacarb and emamectin benzoate against Bihar hairy caterpillar, Spilosoma obliqua (Walker)

The toxicity of indoxacarb and emamectin benzoate was evaluated against 10 days old larvae of S. obliqua by residue contact bioassay method. The data revealed that indoxacarb was more toxic than emamectin benzoate at LC₃₀ (0.004 and 0.001%), LC₅₀ (0.013 and 0.002%) and LC₉₀ (0.198 and 0.034%) levels, at 48 and 72 Hae, respectively. LC₃₀, LC₅₀ and LC₉₀ values of emamectin benzoate against 10 days old larvae of S. obliqua were 0.013, 0.031 and 0.28 at 48 HAE; and 0.004, 0.009 and 0.063 at 72 HAE respectively. Indoxacarb was faster in action compared to emamectin benzoate. At a concentration of 0.02% the LT₃₀, LT₅₀ and LT₉₀ values for indoxacarb were 16.36, 28.75 and 115.26 hours, respectively while at 0.06% concentration of emamectin benzoate (three times higher than indoxacarb) the values were 13.32, 23.31 and 92.30 respectively.