Life history and life table parameters of the predatory mite phytoseiulus macropilis (banks) (acari: phytoseidae) at different temperatures
The change in temperature from 20 to 35°C had an effect on life history and life table parameters of Phytoseiulus macropilis when fed on Tetranychus urticae, this change was studied in the present work and the following results were obtained. The total immature for female varied from 5.62, 4.54, 3.25 and 3.08 days at 20, 25, 30 and 35 °C respectively. The life cycle and life span decreased with increasing temperature 20 to 35 °C . The mites survived longer at 20 °C and oviposited clearly at 25
... ited clearly at 25 °C than on all other temperatures. The number of eggs laid by each female mite exhibited significant differences among four temperatures (F= 845.28; P < 0.0001) as the total average was maximum (70.25 eggs/females) at 25°C, also significant variation was observed for the number of eggs laid by each female per day (F= 281.79; P < 0.0001) as the daily rate was 0.99, 2.03, 1.75 and 1.20 at 20, 25, 30 and 35 2°C respectively. The analysis of the net reproductive rate (Ro) of P. macropilis indicated differences among four temperatures. The cohorts reared at 25°C had the highest R0 value, followed by 30 and 20°C respectively, those at 35°C had the lowest R0 value. The intrinsic rate of natural increase (rm) and the finite rate of increase (λ) varied in a different fashion, best at 30 then 35°C followed by 25°C worst at 20°C. Only the generation time (T) followed a different pattern, being shortest at 35°C and longest at 20°C.