Enzymes and resistance to insecticides in Heliothis virescens.

Computational identification and characterization of putative miRNAs in Heliothis virescens

Heliothis virescens, a polyphagous pest, is one of the most destructive pests of many crops and vegetables. Various insecticides and pesticides are used by agriculturalists to stop the growth and development of this pest. RNA interference is a new area for the management of pests/insects by inhibiting the growth related RNAs. This involves the miRNAs identification and its characterization. In ...

Evidence for multiple mechanisms of resistance to Cry1Ac and Cry2A toxins from Bacillus thuringiensis in Heliothis virescens

Characterization of esterases associated with profenofos resistance in the tobacco budworm, Heliothis virescens (F.).

The utility of microplate and electrophoretic assays for detection of biochemical and physiological mechanisms underlying resistance to profenofos in the tobacco budworm, Heliothis virescens (F.), was assessed. Esterase (EST) activities were significantly higher in profenofos-resistant than -susceptible larvae, and activities were highly correlated (r(2) = 0.87) with resistance to profenofos. B...

A single gene (yes) controls pigmentation of eyes and scales in Heliothis virescens

A yellow-eyed mutant was discovered in a strain of Heliothis virescens, the tobacco budworm, that already exhibited a mutation for yellow scale, y. We investigated the inheritance of these visible mutations as candidate markers for transgenesis. Yellow eye was controlled by a single, recessive, autosomal factor, the same type of inheritance previously known for y. Presence of the recombinant mu...

Cry toxin mode of action in susceptible and resistant Heliothis virescens larvae.

Many pest insect species are effectively controlled by Bacillus thuringiensis (Bt) Cry toxins delivered in plants and biopesticides. Since the insect midgut epithelium contains receptors and other molecules that determine Bt toxicity, characterization of these molecules is necessary for sustained usage of Bt toxins. Studies of Bt susceptible and resistant strains of Heliothis virescens have pro...