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

为了探索将本地天敌人工引入农田并用作生物防治剂的可能模式，利用叶螨和捕食性植绥螨系统进行了研究。主要目标设定在一种捕食性螨种（A.finlandicus（Oudemans））上，该螨种生活在白玉兰（Magnolia hypoleuca）上，引入苹果园以控制叶螨。2003-2004年在盛冈进行了试验性应用，但由于试验期间叶螨密度较低，未能获得明确的结果。在研究过程中，明确了日本北方和中南部白玉兰植绥螨的种类组成。在北方，A.这些结果在伊卡（2002年9月，墨西哥）和EURAAC（2004年7月，柏林）等国际会议上发表。

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.