Response of successive three generations of cotton bollworm, Helicoverpaarmigera (Hübner), fed on cotton bolls under elevated CO2
WU Gang , CHEN Fa-jun , SUN Yu-cheng , GE Feng
DOI:
Received October 18, 2006,Revised March 22, 2007, Accepted , Available online
Volume 19,2007,Pages 1318-1325
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The growth, development and consumption of successive three generations of cotton bollworm, Helicoverpa armigera (Hüubner), fed
on cotton bolls grown under elevated CO2 (double-ambient vs. ambient) in open-top chambers were examined. Significant decreases in
protein, total amino acid, water and nitrogen content and increases in free fatty acid were observed in cotton bolls. Changes in quality
of cotton bolls a ected the growth, development and food utilization of H. armigera. Significantly longer larval development duration
in three successive generations and lower pupal weight of the second and third generations were observed in cotton bollworm fed on
cotton bolls grown under elevated CO2. Significantly lower fecundity was also found in successive three generations of H. armigera fed
on cotton bolls grown under elevated CO2. The consumption per larva occurred significant increase in successive three generations and
frass per larva were also significantly increased during the second and third generations under elevated CO2. Significantly lower relative
growth rate, e ciency of conversion of ingested food and significant higher relative consumption rate in successive three generations
were observed in cotton bollworm fed on cotton bolls grown under elevated CO2. Significantly lower potential female fecundity, larval
numbers and population consumption were found in the second and third generations of cotton bollworm fed on cotton bolls grown
under elevated CO2. The integrative e ect of higher larval mortality rate and lower adult fecundity resulted in significant decreases
in potential population consumption in the latter two generations. The results show that elevated CO2 adversely a ects cotton bolls
quality, which indicates the potential population dynamics and potential population consumption of cotton bollworm will alleviate the
harm to the plants in the future rising CO2 atmosphere.
