Thermal effects on the growth and developmental time of bean Aphis fabae (Hemiptera: Aphididae)
Listed in
This article is not in any list yet, why not save it to one of your lists.Abstract
The aim of this study was to evaluate the thermal effects on the biological parameters of Aphis fabae Scopoli (Hemiptera: Aphididae). The developmental times, survival, and reproductive data were collected for Aphis fabae reared on detached bean leaves ( Phaseolus vulgaris L. ) ‘pinto beans at five temperatures regimes (12°C, 16°C, 20°C, 24°C and 28°C), 65% relative humidity (RH), and a photoperiod of 16:8 (L: D) h. The developmental times of immature stages ranged from 16,65 days at 12°C to 5.70 days at 24°C, but a slight increase again at 28°C (6.62 days). This study presented the optimal developmental threshold for A. fabae slightly to 24°C. The average longevity of mature females significantly decreased from 42.32 days at 12°C to 16.12 days at 28°C. The reproduction rate per female was 62.27 individuals at 16°C and 12.72 individuals at 28°C. The mean generation period of the population ranged from 29.24 at 12°C to 11.50 at 28°C. The highest intrinsic rate of increase ( r = 0.41) was recorded at 24°C, the lowest at 12°C ( r = 0.15). It was evident that temperatures over 28°C augmented the development time, accelerated the death ratio of the nymphal stages, Shrunk Adult longevity, and reduced fecundity. The optimal range of temperature for population growth of A. fabae on bean was 16°C-24°C according to this study.