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The influence of five constant temperatures i.e 16±1°C, 20±1°C, 24±1°C, 28 ±1°C and 32 ±1 ˚C was investigated on the biology and predatory potential of Coccinellid beetle, Harmonia dimidiata (Fab.), (Coccinellidae: Coleoptera), feeding on Myzus persicae aphid. The results revealed that temperature has significant effect on the development time and with increasing temperature, the development time may significantly decrease. Maximum duration was observed at low temperatures and minimum at high temperature level for egg incubation period, larvae, pupa and egg to adult emergence. The number of eggs per female beetle was maximum (656.8±7.08) at 24 ± 1˚C and minimum (184.6±5.16) at 28 ± 1˚C. The results further indicate that at high temperature level 32 ± 1˚C the female could not produce eggs. The predatory potential of larvae, male and female beetle was maximum 827.7±13.39, 14183.0±543.76 and 15375.0±549.98 aphids at 24 ± 1˚C. The results indicate that temperature has profound effect on fecundity and predatory potential as well as development of H. dimidiata. The optimum rearing temperature for this Coccinellid predator was found to be 24 ±1°C followed by 20 ±1°C. It has high potential against M. pericae and thus can be utilized as part of integrated pest management program for the management of this economically important aphid pest.

international journal of environment, agriculture and biotechnology

Effect of Temperature on the Biology and Predatory Potential, of Harmonia Dimidiata (Fab.) (Coleoptera: Coccinellidae) Feeding on Myzus Persicae (Sulzer) (Hemiptera: Aphididae) Aphid