Involvement of the processing step in the susceptibility/tolerance of two lepidopteran larvae to Bacillus thuringiensis Cry1Aa toxin.

Bacillus thuringiensis (Bt) Cry1A toxins are known for their effectiveness against lepidopteran insects. In this study, the entomopathogenic activity of Cry1Aa was investigated against two lepidopteran larvae causing serious threat to various crops, Spodoptera littoralis and Tuta absoluta. Contrarily to S.

Bacillus amyloliquefaciens AG1 biosurfactant: Putative receptor diversity and histopathological effects on Tuta absoluta midgut.

The use of biosurfactant in pest management has received much attention for the control of plant pathogens, but few studies reported their insecticidal activity. The present study describes the insecticidal activity of biosurfactant extracted from Bacillus amyloliquefaciens strain AG1. This strain produces a lipopeptide biosurfactant exhibiting an LC50 of about 180ng/cm(2) against Tuta absoluta larvae.