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- W2074927606 abstract "Abstract The effects of elevated carbon dioxide (CO 2 ) on growth, metabolism, and performance of three generations of cotton bollworm, Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), were studied. The insects were continuously fed transgenic Bacillus thuringiensis (Berliner) (Bt) cotton [ Cry1A(c) ] grown in open‐top chambers. Two levels of CO 2 (ambient and 2× ambient) and two cotton cultivars (non‐transgenic Simian‐3 and transgenic Bt GK‐12) were used and bollworm larvae were reared on all four treatment combinations for three generations. CO 2 level and cotton variety significantly affected the growth and food digestibility parameters of H. armigera , with the exception of larval consumption rate for cotton variety. Overall, elevated CO 2 and transgenic Bt cotton both increased larval lifespan, food consumption rate, relative consumption rate, and approximate digestibility, while decreasing pupal weight, survival rate, fecundity, frass output, relative and mean relative growth rates (RGR/MRGR), and the efficiency of conversion of ingested and digested food (ECI/ECD). Moreover, there were significant CO 2 *variety interactions on pupal weight and ECD, and CO 2 *generation interactions on pupal weight, frass output, and MRGR. Furthermore, transgenic Bt cotton significantly decreased the population‐trend index compared to non‐transgenic cotton for the three successive bollworm generations, especially at elevated CO 2 . Damage inflicted by the cotton bollworm on cotton, irrespective of the presence of insecticidal genes, is predicted to be higher under elevated CO 2 conditions because of individual compensatory feeding on host plants. Conversely, population abundance is presumed to be lower under elevated CO 2 compared to that under ambient CO 2 , particularly in combination with transgenic technologies." @default.
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- W2074927606 date "2007-05-15" @default.
- W2074927606 modified "2023-10-18" @default.
- W2074927606 title "Long-term impacts of elevated carbon dioxide and transgenic Bt cotton on performance and feeding of three generations of cotton bollworm" @default.
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- W2074927606 doi "https://doi.org/10.1111/j.1570-7458.2007.00563.x" @default.
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