Studies on biological control of spider mites by introduction and utilization of native phytoseiid mites.

为了探讨将天然天敌人工引入农田作为生物防治剂的可能模式，采用蜘蛛螨和掠食性植物螨系统进行了研究。以苹果果园为防治蜘蛛螨而引进的白玉兰（Magnolia hypoleuca）上的一种掠食性螨为主要目标。2003-2004年在盛冈县进行了试验应用，但由于试验期间螨密度低，结果不明确。在研究过程中，澄清了日本北部和中南部白玉兰上植物螨的种类组成。在北部地区，古兰蠓（Oudemans）为优势种，而在南部的三重县和岐阜县，古兰蠓（a .sojaensis Ehara）取而代之。这些结果在国际会议上发表，如ICA（2002年9月，墨西哥）和EURAAC（2004年7月，柏林）等。

To investigate a possible model in which native natural enemy is artificially introduced into the agricultural land and it is used as a biological control agent, the study was conducted using spider mites and predacious phytoseiid mites system. The main target was set on a predacious mite species (A.finlandicus (Oudemans)) living on Magnolia hypoleuca, which was introduced in apple orchards to control spider mites. Experimental application was conducted at Morioka in 2003-2004, but clear results was not obtained due partially to low spider mite density during the experimental period.During the course of the study, species composition of phytoseiid mites on Magnolia hypoleuca was clarified in northern and middle-to-south Japan. In north, A. Gnlandicus (Oudemans) was a dominant species but in south of Mie and Gifu prefectures A.sojaensis Ehara replaced the position.These results were presented at international conferences such as ICA (Sept.2002,in Mexico) and EURAAC (July 2004,in Berlin) and others.