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Home > Plants, Pests & Pest Control > Plant Diseases > Thousand Cankers Disease > Walnut Twig Beetle: Survey

Walnut Twig Beetle: Survey


Project Period: 4/1/2016 – 3/31/17


The objective of this survey is early detection of the walnut twig beetle, Pityopthora juglans. The walnut twig beetle is the putative vector of the fungus Geosmithia morbida. The complex of P. juglans and G. morbida causes thousand cankers disease of walnut.


The Minnesota Department of Agriculture (MDA) is working with importers and users of walnut wood from ten locations in southern Minnesota to monitor traps baited for walnut twig beetle during 2016. Walnut trees have also been girdled at some sites and will be cut and placed into emergence cans to identify any insects that have infested them. The MDA also conducted surveys for the thousand cankers disease complex in 2012, 2013 and 2015.

Last Updated: June 20, 2016