Schizotetranychus nanjingensis Ma & Yuan is a mite pest injurious to the giant bamboo (Phyllostachys pubscens) in Fujian, China. The predatory mite Amblyseius longispinosus was explored as a potential biocontrol agent against S. nanjingensis in a series of experiments. Functional response experiments at six different temperatures showed that handling time (Th) generally decreased with temperature, whereas successful attack rate (a) increased with temperature and levelled off at >20° (Table 2). Judging by a/Th values, A. longispinosus Was most efficient against S. nanjingensis at 30–35°C, about half as efficient at 20 and 25°C and performed poorly at 10–15°C. The rate of oviposition increased linearly with prey density. As expected, the number of eggs laid by predators increased linearly with the number of prey they consumed. With a fixed number of prey available, predation rates per predator decreased with predator density. The potential of A. longispinosus as a biocontrol agent against A. nanjingensisis discussed.
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Vol. 4 • No. 1