Field evaluation of the biolarvicide, spinosad 20 per cent emulsifiable concentrate in comparison to its 12 per cent suspension concentrate formulation against Culex quinquefasciatus , the vector of bancroftian filariasis in India

The Indian Journal of Medical Research
C SadanandaneP Jambulingam

Abstract

Biolarvicides may offer alternatives to chemical larvicides as these are known to be safe to environment and selective against the target species. However, only a limited number of biolarvicides have been approved for mosquito larval control. In the current study, a new formulation of spinosad, 20 per cent emulsifiable concentrate (EC) was tested for its efficacy against Culex quinquefasciatus, in comparison to its 12 per cent suspension concentrate (SC). Spinosad 20 per cent EC was tested against Cx. quinquefasciatus immature at 25, 50, 100 and 150 mg active ingredient (ai)/m[2] in cesspits, drains and abandoned wells in comparison with spinosad 12 per cent SC at the optimum field application dosage of 50 mg ai/m[2]. The 20 per cent EC caused 90-100 per cent reduction of pupal density for 7-14 days in cesspits, 10-17 days in drains and 14-30 days in abandoned wells at all dosages tested. At lower dosages of 25 and 50 mg ai/m[2], >90 per cent reduction of pupal density was observed for one week in cesspits and street drains and for two weeks in abandoned wells. The effective duration of control provided by the higher dosages, 100 and 150 mg ai/m[2] was 1.4 to 2 times greater than the lower dosages, 25 and 50 mg ai/m[2]. The fin...Continue Reading

Citations

Jun 23, 2020·Journal of Medical Entomology·Mohamed Ahmed Ibrahim Ahmed, Christoph Franz Adam Vogel
May 12, 2018·The Indian Journal of Medical Research·Kamaraju Raghavendra, Poonam Sharma Velamuri

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