Blackberry Diagnostic Tool

General Decline in Plant Vigor

No visable symptoms (go to virus section)

Canes have galls Larva of rednecked cane borers feed inside primocanes creates a gall and girdles the canes. Infested canes either die or become weakend so they cannot growth in the following year when they are floricanes. Adults feed on leaves.

Root abnormalities

Crown gall can damage canes at the root level. Some cultivars may exhibit low vigor or nutrient deficiencies. Galls are visible at the soil line. The bacteria infects canes through wounds.

 

Crown borer girdle canes a few inches above the soil line in spring and causes canes to wilt and die