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The persistence and insecticidal activity of native strains of Bacillus thuringiensis was evaluated in formulations containing different additives such as arrow-root powder, carboxy methyl cellulose (CMC), gum acacia, non-food grade (NFG) starch, and soluble starch. Persistence of B. thuringiensis varied with different additives used in the formulations. Among the different additives used, NFG starch provided maximum protection to B. thuringiensis and native strain 42 showed maximum persistence (83%) which was higher than that obtained in commercial formulation. In commercial formulation, the persistence of B. thuringiensis was 47% only after 3 d of spray. The feeding trials conducted on second instar larvae of H. armigera using leaves sprayed with NFG starch formulation revealed 70% larval mortality while commercial formulation showed 50% mortality during the same period.

Effect of different additives on the persistence and insecticidal activity of native strains of Bacillus thuringiensis