Life-History Parameters of Three Species of Schizotetranychus on Deciduous Trees (Acarina : Tetranychidae)

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Abstract
Life-history parameters of 3 spp. of spider mites, S. schizopus (Zacher), S. leguminosus Ehara and S. cercidiphylli Ehara, were investigated under laboratory conditions (25 .+-. 1.degree. C, 50-60% RH [relative humidity] and 15L-9D [L = light D = dark]). The total developmental time was shorter in S. schizopus than in the other 2 spp. The intrinsic rate of natural increase (r), the net reproductive rate (R0) and the mean generation time (T) were determined as follows: S. schizopus: r, 0.206, R0, 27.53 and T, 16.13; S. leguminosus: r, 0.173, R0, 27.06 and T, 19.10; S. cercidiphylli: r, 0.160, R0, 26.05 and T, 20.42. The relationships between the difference of life-history parameters of these 3 spp. and the different patterns of defoliation of their host plants are discussed.