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1 March 2009 Efficacy of Two Formulations of the Bioinsecticide Spinosad Against Culex quinquefasciatus in India
C. Sadanandane, P.S. Boopathi Doss, P. Jambulingam, M. Zaim
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Abstract

Spinosad 12% suspension concentrate (SC) and 0.5% granular (G) formulations were tested against Culex quinquefasciatus immatures at 3 dosages—50, 100, and 150 mg active ingredient (AI)/m2—in cesspits, street drains, and disused wells in comparison with temephos 1% G at 1 part per million. The 2 formulations reduced the density of pupae of Cx. quinquefasciatus by 80–100% for 7–14 days in cesspits, 7–18 days in drains, and 33–69 days in disused wells at the 3 dosages tested. The 12% SC and 0.5% G formulations were equally effective in suppressing the larval and pupal populations of Cx. quinquefasciatus in all the habitats treated. At 100 mg AI/m2 in drains and cesspits, the efficacy of spinosad 0.5% G was greater than that of temephos (1% G) and that of spinosad 12% SC was comparable to that of temephos (1% G) applied to the 2 habitats. In disused wells, both the formulations lasted longer than temephos. Based on the small-scale trial, the rate of 150 mg AI/m2 of spinosad was selected for field application to cesspits and drains and 50 mg AI/m2 for application to disused wells. The efficacy observed in medium-scale trials was in agreement with that of small-scale trials. The trial showed that the 2 formulations of spinosad can be used for larval control of Cx. quinquefasciatus, at 50 mg AI/m2, applied at weekly intervals to cesspits and street drains and at monthly intervals to disused wells. At the higher dose of 150 mg AI/m2, the 2 formulations were effective in suppressing the pupal population for 2 wk in cesspits and street drains and for 2 months in disused wells.

C. Sadanandane, P.S. Boopathi Doss, P. Jambulingam, and M. Zaim "Efficacy of Two Formulations of the Bioinsecticide Spinosad Against Culex quinquefasciatus in India," Journal of the American Mosquito Control Association 25(1), 66-73, (1 March 2009). https://doi.org/10.2987/08-5807.1
Published: 1 March 2009
JOURNAL ARTICLE
8 PAGES

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