Biological agent type
Brown-winged root moth.
Plant species attacked
spotted knapweed (Centaurea stoebe)
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Image by Eric Coombs, Oregon Department of
Agriculture.
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If images are downloaded and used from the ODA web site please be sure to credit the photographer.
Site of attack
Central vascular tissue of the root.
Mode of attack
The larvae mine the roots.
Destructive stage
Larval-internal.
Collection and release information
This agent failed to establish in Oregon.
History in Oregon
The root boring moth Pelochrista medullana was first released in Hood River County in 1999. One adult was recovered in 2000 and an additional release was made at the site. The moth has been very difficult to establish in the western U.S. Adults were obtained from Montana in order to establish a field insectary site in an area with less severe winters, but no agents have been recovered since 2000.
Release status in Oregon
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