Efficacy of Native Bacillus thuringiensis Berliner Isolates against Diamond Back Moth, [Plutella xylostella (Linnaeus)] and Its Compatibility with Common Insecticides

The comparative toxicity of native Bacillus thuringiensis (B.t.) strains against Diamond back moth, Plutella xylostella and their compatibility with some common insecticides were identified. In the bioassays five native strains NSC-1, NSC-3, NSC-9, COR-4 and GUR-5 were identified and proved as a novel isolate for controlling this pest. All the five native isolates were showed high toxicity and causing 100% mortality at 72 h after treatment. Compatibility of B.t isolates with chemical insecticides showed that all the tested insecticides (chlorpyriphos, alphamethrin, monocrotophos, multineem, spinosad and quinolphos) were compatible with the selected native B.t isolates except acetamiprid, DDVP and imidacloprid at all the field recommended dose, half the recommended dose and double the field recommended dose.