Thursday, May 17, 2012

Updated Thousand Cankers Disease Survey Guidelines

The U.S. Forest Service and APHIS PPQ have updated the survey guidelines for Thousand Cankers Disease to include instructions for how to use the lure developed for the walnut twig beetle. Thousand Cankers Disease is caused by a fungus, Geosmithia morbida that is carried from tree to tree by walnut twig beetles, Pityophthorus juglandis. It causes death in species of black walnut. It has only been reported in the west at this point, but this disease has the potential to kill balck walnut trees in eastern U.S forests unless we stop it.

Learn how you can help stop the spread
 of this and other tree killing diseases from 

Adult walnut twig beetle
Steven Valley, Oregon Department of Agriculture,
Adult walnut twig beetles
Whitney Cranshaw, Colorado State University,