|Biological agent type
stem borer beetle
Plant species attacked
leafy spurge (Euphorbia esula)
Click on image to view larger photo.
Image by Eric Coombs, Oregon Department of Agriculture.
Image by Gary Brown, USDA-APHIS.
If images are downloaded and used from the ODA web site please be sure to credit the photographer.
Site of attack
Stems, roots, root crown.
Mode of attack
The larvae bore in the stems and roots of larger plants. Adults girdle the top of a stalk before laying eggs in the stem, they also do minimal feeding damage on leaves.
Larval-internal and adult.
Collection and release information
This biological agent is limited in distribution and can be collected by sweep net June-July. Consult with ODA for availability for your area.
History in Oregon
In 1982 the root/stem boring beetle Oberea erythrocephala was released in Klamath County but failed to establish. It was re-released in 1994 in several counties. The beetle now occurs at many sites in Crook County. The population at Smith Rock State Park in Deschutes County provides releases for other counties.
Release status in Oregon
Click on map to view larger image.