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

Image by Eric Coombs, Oregon Department of Agriculture.  

Image by USDA APHIS PPQ

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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 flea beetle has been released in 9 counties and recovered in 6.

History and comments
Three flea beetles, Aphthona cyparissiae, Aphthona flava, and Aphthona nigriscutis were introduced in 1989. A. nigriscutis and A. cyparissiae are well established, but have been slow to increase and spread. A. cyparissiae is usually a small portion mixed in with the other more common species, and has not been much of a contribution to leafy spurge control. It is quite difficult to tell apart from the more common A. nigriscutis. Since 1994, several release sites in central and E OR have shown significant depression of leafy spurge density by A. nigriscutis, A. cyparissiae, and A. lacertosa. These beetles have provided some limited control but not like the spectacular widespread results that were observed in Montana, North Dakota, and Wyoming. The heavier clay soils may limit the efficacy of the flea beetles in Oregon. Several populations have been harvested for redistribution.

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