Abstract
Aphelinus asychis has been used to control various species of aphids. Temperature is a crucial abiotic factor for the development and reproduction of insects. This study examined the influence of different constant temperatures (20, 25 and 30 °C) on the longevity, net reproductive rate (R0), intrinsic rate of increase (r), net killing rate (Z0) and finite killing rate (θ) of A. asychis parasitizing the cabbage pest Myzus persicae, and compared its control efficiency. The results showed that increasing temperature decreased the longevity of A. asychis significantly. The value of r was significantly higher at 30 °C than at 25 and 20o C. Similarly, θ was significantly higher at 30 °C (0.7163 aphids) than at 25 (0.5654 aphids) and 20o C (0.3522 aphids). Aphelinus asychis could produce progeny successfully within the range of 20-30 °C and its control efficiency was higher at high temperatures than at low temperatures. We discuss the implications of these results for the application of this parasitoid for the biological control of the cabbage aphid in greenhouse and field conditions.
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