Black Walnut Mortality in Colorado Caused by the Walnut Twig Beetle and Thousand Cankers Disease

Fig. 7. Gallery and canker development 4 weeks after placement of adult walnut twig beetles emerged from Juglans nigra with thousand cankers disease in a cage containing a branch segment from a healthy black walnut.



Image from Plant Health Progress article:
Black Walnut Mortality in Colorado Caused by the Walnut Twig Beetle and Thousand Cankers Disease