How to Manage Pests

Pests in Gardens and Landscapes

Ceanothus stem gall moth—Periploca ceanothiella

The ceanothus stem gall moth probably occurs throughout the United States wherever Ceanothus species occur, but the moth is apparently a pest only in California. Adults are small dark moths.

Damage

Larvae tunnel into plants and cause spindle-shaped swellings on stems. Plant growth is stunted and blooming is reduced.

Solutions

Most galls are not known to harm trees. Prune and dispose of galls if they are annoying. This may provide control of some species if pruning is done when the immatures are in plant tissue and before the adults begin to emerge. Consider replacing susceptible plants with ceanothus species that are not infested or only lightly infested by stem gall moths.

Ceanothus stem gall moth larva
Ceanothus stem gall moth larva

Swollen stems infested with moth larve
Swollen stems infested with moth larvae


Statewide IPM Program, Agriculture and Natural Resources, University of California
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