Abstract
Natural variation in susceptibility of field collected cotton American bollworm (Helicoverpa armigera) to purified Bacillus thuringiensis (Bt) Cry lAc toxin was investigated to establish a geographic baseline for comparison of future population responses to the increased use of Bt based insect control products like Bt transgenic crops and commercial formulations. Populations of H. armigera were evaluated for their susceptibility to purified Bt CrylAc toxin. The range of LC50's among selected populations from Lahore, Multan, Rahim Yar Khan and Hyderabad in response to CrylAc toxin was more than 16 fold. The data provide a strong basis for monitoring changes in susceptibility of H. armigera populations to future use of Bt toxins in Bt transgenic crops program in Pakistan.
SHAHID KARIM , S. RIAZUDDIN. (1999) NATURAL VARIATION AMONG HELICOVERPA ARMIGERA (HUBNER) POPULATIONS TO BACILLUS THURINGIENSIS CrylAc TOXIN , Punjab University Journal of Zoology, Volume 14, Issue 1.
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