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A Biological and Taxicological Study of the Spider Mite, Tetranychus kanzawai Kishida
Thesis Abstract:
The life history, reproductive capacity and behavior of T. kanzawai on soybeans were studied as well as its response to six acraicides at different stages. Predatory habits of a phytoseiid mite, Amblyseius longispinosus (Evans), were also observed.
The adult females laid their eggs singly on the nether surface of soybean leaves. Mated females could lay from 10 to 1599 eggs with an average of 78.67 eggs and the unmated ones, from 9 to 143 eggs or an average of 61.50 eggs.
The total development period from eggs hatching to adult emergence averaged 6.64 days for females and 5.37 days for males. Incubation period lasted 4.17 and 4.37 days for females and males respectively. Average larva period covered 2.16 days for females and 1.86 days for males. Incubation period lasted 4.17 and 4.37 days for female and 1.86 days for males. Average female protonymphal stage was 1.92 days and the male, 1.54 days. Average female and male deutonymphal stage lasted for 2.54 and 1.96 days, respectively. Each adult female laid an average of 3.7 eggs a day for 21.21 days. Adult females lived slightly longer (21.21 days) than males (20.72 days).
Adults of A. longispinosus were better predators of T. kanzawai than the nymphs. Female at oil development stages consumed more prey than males.
The eggs appeared to be the most resistant and the adults, the most suscepitable to all six acarides tested. In terms of residual toxicity, Azodrin and binapacryl were the most effective chemical in controlling T. kanzawai.