Colonizing characteristics of two phytoseiid mites, Phytoseiulus persimilis Athias-Henriot and Neoseiulus womersleyi (Schicha) (Acari: Phytoseiidae) on greenhouse grapevine and effects of their release on the kanzawa spider mite, Tetranychus kanzawai Kishida (Acari: Tetranychidae)

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  • Kondo Akira
    Agricultural Experiment Station, Okayama Prefectural General Agriculture Center, Japan

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  • Colonizing Characteristics of Two Phytoseiid Mites, Phytoseiulus persimilis Athias-Henriot and Neoseiulus womersleyi (Sachicha) (Acari: Phytoseiidae) on Greenhouse Grapevine and Effects of Their Release on the Kanzawa Spider Mite, Tetranychus kanzawai Kishida (Acari: Tetranychidae)

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In order to estimate the potential of Phytoseiulus persimilis and Neoseiulus womersleyi (formerly called Amblyseius womersleyi) as control agents for Tetranychus kanzawai on greenhouse grapevine, the effects of their release and colonizing characteristics were compared between the two species. Release of either P. persimilis or N. womersleyi onto potted grapevine plants at a ratio of 10 adult spider mite females to one phytoseiid mite demonstrated that both species could suppress population densities of the spider mite, but the control ability was superior in the latter. Comparison of the colonizing characteristics of P. persimilis and N. womersleyi adult females at different densities of T. kanzawai adult females on grapevine leaflets revealed that the time of dispersal from the leaflet was much later in the latter than in the former. Also, the numbers of eggs laid and adult female spider mites consumed on the leaflet were both greater in the latter. Thus, N. womersleyi could colonize grapevine more successfully and suppress the population density of T. kanzawai more efficiently than P. persimilis. Consequently, N. womersleyi was considered to be more adequate as a control agent for T. kanzawai to introduce into grapevine greenhouse than P. persimilis.

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