| Summary: | 碩士 === 國立中興大學 === 昆蟲學系所 === 106 === Scolothrips takahashii Priesner (Thysanoptera: Thripidae) is a common predatory thrips which feeds on spider mites, it is considered an important natural enemy and a potential biological control agent against spider mites. In order to evaluate the efficacy of S. takahashii against tetranychid mites, life table and functional response study were conducted under 25±1oC, with Tetranychus urticae Priesner as prey. The intrinsic rate of increase (r), finite rate of increase (λ), net reproduction rate (R0), mean generation time (T) were 0.1674 d-1, 1.1822d-1, 62.26 offspring / individual and 24.68d. The net consumption rate (C0) was 846.15, mean daily consumption rate was 51.92 eggs for females and 19.28 eggs for males. S. takahashii exhibited type III functional response when offered T. urticae deutonymphs. Based on the random predator equation, the estimated maximum attack rate (a) and handling time (Th) were 0.1376h-1 and 0.7883h. In addition, a life table experiment was conducted to evaluate the offspring sex allocation and population dynamic of Tetranychus ludeni Zacher under group-rearing condition with different sex ratios. All bisexual groups produced offspring with similar sex allocation patterns which started with majority females, then transited during the middle of oviposition period and turned male-biased at the end of oviposition period.
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