Laboratory Evaluation of Comparative Toxicity of Bacillus thuringiensis Subspecies to Larvae of Plutella xylostella and Bombyx mori


  • Tamil Nadu Agricultural University, Centre for Plant Protection Studies, Coimbatore, 641 003, India
  • Tamil Nadu Agricultural University, Coimbatore, 641 003, India


Laboratory bioassay tests on the comparative efficacy of eight Bacillus thuringiensis (B.t.) subspecies against third instar larvae of Plutella xylostella L. as well as its safety to second lnstar larvae of Bombyx mori L. revealed that B.t. subsp. kurstaki (Bactospeine) was the most toxic to larvae of P. xylostella followed by B.t. subsp. thuringiensis and B.t. subsp. kurstaki (lab culture). The B.t.t. and B.t.k. (Bactospeine) were found to be less toxic to the larvae of Bombyx mori than the other species.


Bacillus thuringiensis, Subspecies, Toxicity, Plutella xylostella, Bombyx mori.

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