Search IPM RPD No. Canker diseases are common, widespread, and destructive on a wide range of woody plants. Cankers also slow the normal healing of wounds and provide entry for wood decay or wilt producing fungi and other organisms.
Cankers are also common in nurseries and plantations where the plants are grown closely together.
Click on image for larger version Figure 1. Phomopsis canker damage on Russian Olive. Note dieback of twigs. Symptoms Click on image for larger version Figure 2. Smooth or bark patch of white oak.