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Aphthona czwalinae
Biological agent type
root/defoliating flea beetle
 
Plant species attacked
leafy spurge (Euphorbia esula)
 
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Apthona czwalinae adult
Image by Eric Coombs, Oregon Department of Agriculture.
 

Image by L. Berry.


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Impact on target plant 
The larvae of the flea beetles feed on the roots and buds causing plant mortality. Adults feed on leaves and flowers, and can cause severe defoliation during outbreaks.

Collection and release
collect adults with sweep net in June-July. Release 500+.

Distribution
This beetle has been released and established in 9 counties.

History and comments
In 1993, two black species, A. czwalinae and A. 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 E Oregon. Both species, particularly A. lacertosa, which usually accounts for >90% of most releases, have been heavily redistributed in eastern and central Oregon.

Links
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ODA Bio Control Program
Bioagent History and Decision Making Chart