Effectiveness of biological insecticides in controlling the diamondback moth (Lepidoptera: Plutellidae) using Bacillus thuringiensis, Azadirachtin, and new insecticides on cabbage

Dakshina R. Seal

Abstract


Diamondback moth, Plutella xylostella (L.), is the most destructive pest of cruciferous crops in the world. Various studies were conducted in 2007 and 2008 to control diamondback moth using Bacillus thuringiensis, azadirachin, and new insecticides. The B. thuringiensis-based product, VBC 60129, did not reduce diamondback moth populations. Bacillus thuringiensis, subsp. kurstaki, strain ABTS-351 (DiPel® DF) at 0.5 and 1.5 lb/acre signifi cantly controlled diamondback moth when applied weekly or biweekly. Application of B. thuringiensis at weekly intervals provided better control of diamondback moth than the application of same products at 2-week intervals. Azadirachtin 1.2% ME (Ecozin® plus, 8.0 oz/acre) signifi cantly reduced diamondback moth larvae. The premixed products, chlorantraniliprole + thiamethoxam (Voliam FlexiTM ) and chlorantraniliprole + lambda-cyhalothrin (Voliam XpressTM) at all experimental rates signifi cantly reduced diamondback moth populations. Azadirachtin-based products were also effective in reducing diamondback moth.

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283