I began my doctoral program at North Carolina State University (NCSU), Raleigh, in August 1977, after completing an M.S. entomology from of Arizona, Tucson, where worked on the pink bollworm, Pectinophora gossypiella (Saunders), cotton. applied to graduate school NCSU because department’s strong reputation for IPM research and extension with ecological grounding, faculty such as R. L. Rabb, J. ...

Abstract Background The effectiveness of Bacillus thuringiensis ( Bt ) cotton against target arthropod larvae is decreasing day by day. comparative effect expression among varieties and different plant parts was observed the bollworms: Helicoverpa armigera Pectinophora gossypiella larvae. Results In present study, larval mortality H. higher than P. selected cultivars. Median lethal concentratio...

The cultivation of transgenic pest-resistant cropsmay reduce pesticide application, improve production and increase economic benefit. Breeding and planting transgenic pest-resistant crops is expected to be a promising way to control pests. Pest-resistant transgenic researches in China began in the early 1990s. In 1992, China developed the country’s first Bt protein gene (CryIA gene) with the in...

Crude and purified extracts of non edible seed.of Pongamia glabra ( Karanja) were tested for their toxicity growth and development against the 2 instar larvae of the American bollworm, Helicoverpa armigera (Hubner) a serious pest of cotton. Larvae reared on synthetic diet at concentrations of 1 and 0.5% of P. glabra exhibited 100% mortality, whereas at sublethal concentrations of 0.05% and 0.01...

The effectiveness of commercial Bt-cotton in pest management, influence on arthropod diversity, natural enemies, and toxin flow in the insect fauna under field conditions were studied keeping in view the need to assess bioefficacy and biosafety of Bt-transgenic cotton. There were no significant differences in oviposition by Helicoverpa armigera on Bt-transgenic and non-transgenic cottons (9.2 v...

Laboratory experiments were conducted to evaluate the behavior of bollworm, Helicoverpa zea (Boddie), and tobacco budworm, Heliothis virescens (F.), larvae on meridic diet with different concentrations of the Cry1Ac and Cry2Ab proteins from Bacillus thuringiensis subsp. kurstaki Berliner. The proteins used in these experiments are the ones in commercially available Bollgard and Bollgard II cott...