|Biological agent type
Plant species attacked
leafy spurge (Euphorbia esula)
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Images by Eric Coombs, Oregon Department of Agriculture.
If images are downloaded and used from the ODA web site please be sure to credit the photographer.
Site of attack
Leaves, flowers; and roots.
Mode of attack
This agent reduces the plant's root reserves and diminishes its ability to replace them. Larval root damage may also provide entry points for soil-inhabiting pathogenic fungi.
Larval and adult.
Collection and release information
Limited in distribution. Can be collected by sweep net June-July. Consult with ODA for availability for your area.
History in Oregon
In 1993, two black species, Aphthona czwalinae and Aphthona lacertosa were released. Both were recovered in 1994. These two species seem to prefer more moist sites and have reduced leafy spurge at a number of sites in eastern Oregon. Both species, particularly Aphthona lacertosa, which usually accounts for >90% of most releases, have been heavily redistributed in eastern and central Oregon.
Release status in Oregon
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