Premium
Response of multiple generations of cotton bollworm Helicoverpa armigera Hübner, feeding on spring wheat, to elevated CO 2
Author(s) -
Wu G.,
Chen F.J.,
Ge F.
Publication year - 2006
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.2005.01025.x
Subject(s) - biology , helicoverpa armigera , fecundity , larva , zoology , bollworm , pupa , population , toxicology , agronomy , botany , demography , sociology
The growth, development and consumption of three successive generations of cotton bollworm, Helicoverpa armigera (Hübner), reared on milky grains of spring wheat grown under elevated CO 2 (double‐ambient vs. ambient) in open‐top chambers (OTCs) were examined. Decreases in protein, total amino acid, water and nitrogen content, and increases in total non‐structure carbohydrates (TNCs) and ratio of TNC : nitrogen were found in wheat milky grains grown under elevated CO 2 conditions. Changes in quality of wheat grains affected the growth, development and food utilization of H. armigera . Significantly longer larval lifespan for the third generation and lower pupal weight for all generations were observed in cotton bollworm fed on milky grains of spring wheat grown under elevated CO 2 conditions. Bollworm fecundity was significantly decreased for the second and third generations under elevated CO 2 levels. The consumption, frass per larva and relative consumption rate significantly increased in elevated CO 2 compared with ambient CO 2 conditions. However, the potential population consumption was significant reduced by elevated CO 2 in the second and third generations. The results of this study indicate that elevated CO 2 levels adversely affect grain quality, resulting in consistently increased consumption per larva for a longer period to produce less fecund bollworm through generations, suggesting that net damage of cotton bollworm on wheat will be less under elevated atmospheric CO 2 levels because increased consumption is offset by slower development and reduced fecundity.