Influence of temperature and daylength on population development ofAphis gossypii onCucurbita pepo |
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Authors: | Y N Aldyhim and A F Khalil |
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Institution: | (1) Plant Protection Department, College of Agriculture, King Saud University, P.O. Box 2460, 11451 Riyadh, Saudi Arabia |
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Abstract: | The life table parameters ofAphis gossypii Glover were evaluated in tow sets of experiments onCucurbita pepo. The first set was conducted at six constant temperatures (5°C increments from 10–35°C) with 12 h photophase. The second
set of experiments was conducted at 6, 12, and 18 h photophase at 25°C. Nymphal survivorship was 100% at 15, 20, 25 and 30°C.
However, it was 80 and 0% at 10 and 35°C, respectively. The optimum temperature for body length was 10°C, and body length
decreased with increasing temperature.A. gossypii attained its optimum growth and reproduction at 25°C. At this temperature, the net reproductive rate (79.7), intrinsic rate
of increase (0.496) and finite rate of increase (1.6) were largest while generation time (6.6 d) and population doubling time
(1.4 d) were smallest. Temperatures above and below 25°C reduced the net reproductive rate, and the intrinsic and finite rates
of increase. The intrinsic and finite rates of increase ofA. gossypii reared at 18 h photophase (0.53 and 1.7) were significantly higher than at 12 (0.43 and 1.5) and 6 h daylength (0.49 and
1.6). |
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Keywords: | Insecta Aphididae intrinsic rate of increase |
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