Biological agent type
Plant species attacked
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Egg and larval track
Images by Eric Coombs, Oregon Department of Agriculture.
Collecting adults on beating sheets
If images are downloaded and used from the ODA web site please be sure to credit the photographer.
Impact on target plant
The larvae feed on the seeds in the seedpods. Adults feed on pollen.
Collection and release
Collect adult beetles in the spring during flowering. They can be sweep-netted or beat onto a beating sheet and aspirated into a collecting vial. Release 100-200 adults per site. The beetle is widespread at most sites, therefore further redistribution will be on an as needed basis.
The seed beetle has been released in 19 counties and recovered in 16.
History and comments
The seed beetle Bruchidius villosus was first released in Oregon in 1998, in Marion and Lane Counties. The beetle is an accidental introduction to the East Coast, but went through the TAG testing protocol for safety in order to be introduced into Oregon. The insect has also been released as a biocontrol agent in New Zealand. The beetle has been introduced at numerous sites since 2000. Populations are increasing, and at nursery sites (>5 years old), the bruchid is out competing the seed weevil. Limited redistribution began in 2004. In 2007 and 2008, the bruchid was widely redistributed in W Oregon through 2010. Extensive surveys in 2009 showed that the beetle is widely established through out the entire Willamette Valley, at several coastal sites, and at elevations up to 2,700 feet. Experiments are being conducted to see if the beetle will survive on French broom in SW OR.