Tuesday, 19 November 2002
D0300

This presentation is part of : Display Presentations, Subsection Ca. Biological Control

Reduction in density of spotted knapweed since the establishment of the root moth, Agapeta zoegana L., and the root weevil, Cyphocleonus achates, at three locations in western Montana

Jim M. Story, Janelle Corn, and Linda White. Montana State University, Western Agricultural Research Center, 580 Quast Lane, Corvallis, MT

The root moth, Agapeta zoegana L., and the root weevil, Cyphocleonus achates (Fahraeus) are Eurasian insects introduced for biological control of spotted knapweed, Centaurea maculosa Lamarck, in North America. The moth was released in western Montana in 1986, while the weevil was released in 1990. Data were collected on spotted knapweed density from 1993 through 2002 at three sites where the moth and weevil became well established. We report the changes in knapweed density and the response of competing vegetation during this 10-year period.



Species 1: Lepidoptera Cochylidae Agapeta zoegana
Species 2: Coleoptera Curculionidae Cyphocleonus achates
Keywords: Centaurea maculosa, biological control

Back to Display Presentations, Subsection Ca. Biological Control
Back to Posters
Back to The 2002 ESA Annual Meeting and Exhibition