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Abstract
Life table studies were conducted in the laboratory for the eulophid gregarious pupal parasitoid, Tetrastichus sp., on Hyphantria cunea Drury at a constant temperature of 28.2±2°C, 50–60% RH to evaluate their impact on the host and their potential biological control. Development of immature stage took 20.1±2.7 d; adult females lived for 23.2±2.2 (range, 16–27) d and produced a mean of 53.6±26.6 adult progeny per female, with a sex ratio of 1: 9.5 (M:F). The intrinsic rate of natural increase (rm) was 0.178/ female/day; the net reproductive rate (R0 ), 46.74; the capacity for increase (rc) 0.177; the finite rate of increase (λ) 1.195/female/day; thus each female contributed 46.74 individuals to the population in a mean generation time of 21.6 d. Biological factors in determining the life history trait variation of the parasitoid were discussed.
Notes
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