Research Article 
Compatibility of Bio-insecticide with Chemical Insecticide for Management of Helicoverpa armigera Huebner
Feeroza Khalique and Khalique Ahmed
Pakistan Journal of Biological Sciences, 2005, 8(3), 475-478.
Abstract
The inter-specific compatibility between commercial preparation Costar® WP having Bacillus thuringiensis kurstaki Berliner (Btk) and Larvin® (Thiodocarb) were evaluated against chickpea pod borer, Helicoverpa armigera Huebner. The combination of low concentrations of Larvin® had reduced lethal concentration (that is, increased toxicity at LC50 and LC90) of Bacillus thuringiensis (Costar® WP) when first instar larvae of chickpea pod borer, Helicoverpa armigera Huebner were fed on artificial diet treated with bacteria supplemented with low dosages of chemical insecticide. The combination treatment (Costar® WP+Larvin® LC10) increased potency of Costar® WP from 77,600 to 1,04,000 IU mg-1. Synergistic interaction indicate that Larvin® (Thiodocarb) can be used with B. thuringiensis for management of H. armigera in the field. Laboratory test of B. thuringiensis further in low dosages supplemented with same and other group of chemical insecticides against H. armigera are suggested.
ASCI-ID: 1-3497
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