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pp.163-168
Temperature dependent development of Tetranychus. urticae Koch was studied on the leaf of eggplant at 17, 22, 27, 32 and 37℃, T. urticae showed a minimum mortality at 27℃ and it increased at higher or lower temperatures than 27℃. The hatchability was low at 17 and 37℃. The duration of development decreased with increasing temperatures i.e., 5.3d at 37℃ and 25.8d at 17℃. Linear regression analysis of temperature vs. rate of development yielded the higher r² ≥ 0.88 resulting in a good fit of the estimated line in the range of 17~37℃. Developmental zero temperature was 12.5℃ for the entire immature stage of female and 12.8℃ for that of male. Thermal constants were 80.5 and 74.7 degree days for those of female and male, respectively. Adult life span and oviposition period decreased with increasing temperatures. The number of eggs laid per female peaked at 141.0 eggs at 27℃, while that was a minimum 78.0 eggs at 37℃. Rate of hatchability, ratio of female, and R₀ were increased up to 27℃, and than declined thereafter. Intrinsic rate of natural increase (Rm) increased with rising temperatures and showed a maximum 0.5652 at 37℃. Also, λ increased with increasing temperature. Doubling time (Dt) and generation time (T) decreased with increasing temperature.
