Residual toxicity of indoxacarb and spinosad on Aprostocetus purpureus cameron and Tachardiaephagus tachardiae howard - The parasitoids of lac insect Kerria Lacca (KERR)
Jaiswal, A. K. | Singh, J. P. | Monobrullah, Md | Patamajhi, P.
Laboratory evaluation of two pesticides namely indoxacarb and spinosad was carried out for their residual efficacy against adult stage of two major parasitoids associated with lac insect viz., Aprostocetus purpureus Cameron and Tachardiaephagus tachardiae Howard by residual film contact method. Indoxacarb caused 51.8, 37.5 and 32.7% mortality of A. purpureus within 6 h of treatment and 86.1, 65.6 and 67.2% mortality within 24 h, at 0.0145, 0.0073 and 0.0035% concentrations, respectively. Whereas, mortality of A. purpureus to the tune of 97.0, 100, 73.7 and 46.7% was recorded within 6 h and 100% within 24 h of treatment with spinosad at the concentrations of 0.0075, 0.005, 0.0025 and 0.0012%, respectively. Similarly, spinosad caused 66.7, 76.2, 80.0, 82.1, 83.3, 86.7% mortality of T. tachardiae at 0.0006, 0.0012, 0.0025, 0.005, 0.007, 0.014% concentrations, respectively within 1 h and 100% within 4 h of treatment. Based on mortality within 24 h of treatment it can be concluded that the spinosad is more effective than indoxacarb as far as A. purpureus is concerned. The effectiveness of spinosad on both parasitoids is almost at par and sufficient number of parasitoids died within very short span of time.
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