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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2010年47 No.3

Study of utilizing Pyemotes zhonghuajia to control Semanotus bifasciatus beetles
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Key Words:Pyemotes zhonghuajia, biological control, Semanotus bifasciatus
Abstract:     Semanotus bifasciatus (Motschulsky) is one of the major stem borers of cypress. First to the fourth stage larvae of this species heavily damage phloem and older larvae begin to damage xylem. Older larvae block the tunnel connecting them to the outside world with frass, which may hinder the entrance of small predators. We assessed the effectiveness of the Po mite, Pyemotes zhonghuaji(Yu and Zhang), as a biological control for first to the second and third to the fourth stage S. bifasciatus larvae, and compared the cost effectiveness of releasing different numbers of mites. The control effectiveness of a treatment rate of 1 000 mites per cm DBH on first to the second stage larvae was up to 83.0%. Although releasing more mites (2 000/cm DBH) achieved control effectiveness on third to the fourth stage larvae of 87.7%, this was less cost-effective than the lower treatment rate. Po mites are a more effective biological control of S. bifasciatus larvae no more than 1 to 2 cm long.
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