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

为了探索一种可能的模式，在农田中人工引入天敌并将其用作生防剂，利用蜘蛛和捕食性植物体螨系统进行了研究。主要目标是在苹果园引入以防治蜘蛛为目的的捕食性叶螨(A.finlandicus(Oudemans))。2003-2004年在盛冈进行了试验应用，但由于试验期间蜘蛛密度较低，没有取得明显的效果。在研究过程中，澄清了日本北部和中南部地区厚朴上植革螨的种类组成。这些结果在ICA(2002年9月在墨西哥)和EURAAC(2004年7月在柏林)等国际会议上公布。

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.