Efficacy of Native Bacillus thuringiensis Berliner Isolates against Diamond Back Moth, [Plutella xylostella (Linnaeus)] and Its Compatibility with Common Insecticides
Anandhi, P *
Department of Agricultural Entomology, Tamil Nadu Rice Research Institute, Aduthurai, India.
Elamathi, S
Department of Agronomy, Tamil Nadu Rice Research Institute, Aduthurai, India.
Ahila Devi, P
Plant Pathology Unit, Tamil Nadu Rice Research Institute, Aduthurai, India.
Yashoda, P
Department of Agricultural Entomology, Anbil Dharmalingam Agricultural College and Research Institute, Trichy, India.
Elenchezhiyan, K
Department of Agricultural Entomology, Agricultural College and Research Institute, Killikulam, India.
Leena, G
Department of Agricultural Entomology, Tamil Nadu Rice Research Institute, Aduthurai, India.
Velmurugan, S
Department of Agricultural Entomology, Tamil Nadu Rice Research Institute, Aduthurai, India.
*Author to whom correspondence should be addressed.
Abstract
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.
Keywords: Bacillus thuringiensis, insecticidal activity, Plutella xylostella, bioassay