How to Manage Pests

Pests in Gardens and Landscapes

Yellow rust—Phragmidium rubi-idaei

Yellow rust occurs mostly on boysenberries and blackberries. Small, yellow, blisterlike pustules appear in spring, first on fruiting canes and then on leaves. Canes dry out and crack, preventing proper ripening of fruit.

Solutions

The fungus that causes yellow rust overwinters on fruiting canes. Prune out and destroy diseased canes before fall rains and apply a fixed copper fungicide. Yellow rust spores are released from leaves and spread by wind in spring. Avoid overhead irrigation. Spray with a fixed copper fungicide in spring when new laterals are leafing out, and again when flowers begin to open.

Yellow rust on raspberry leaves
Yellow rust on raspberry leaves


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/GARDEN/FRUIT/DISEASE/yellowrust.html revised: January 8, 2014. Contact webmaster.