Effect of Three Constant Temperatures on Life Table Parameters of Tetranychus turkestani Ugarov & Nikolski (Prostigmata: Tetranychidae)



The spider mite, T. turkestani, is considered as one of the most important polyphagous pests of many crops. Its reproductive ability, developmental time, preimaginal mortality and reproduction rate were determined on kidney bean at 20, 25 and 30°C,70±5% RH and 16L:8D. Female longevity and immature developmental period (6.74 and 5.8 days, respectively) were shorter at 30°C than at 20 and 25°C. These parameters decreased with temperature increasing. Maximum mortality was obtained at 30°C during the protochrystalisd stage (5.32%) and the highest number of produced eggs per female (131.9 eggs) was obtained at 20°C. The intrinsic rate of natural increase (rm) was obtained as 0.18, 0.29 and 0.36 at 20, 25 and 30°C, respectively. Maximal value for rm was observed at 30°C .The highest net reproductive rate (R0) was obtained at 25°C (78.27). Generation time was 23.99, 14.96 and 9.33 at 20, 25 and 30°C, respectively.