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Tree Diseases: Crown Gall

Introduction Crown gall is a tree disease of many woody shrubs, and some herbaceous plants. The disease is caused by the bacterium Agrobacterium tumefaciens, a…

Tree Diseases: Dutch Elm Disease

Introduction Dutch elm disease is a fungal infection that affects many species of elm. It is one of the most destructive tree diseases in North…

Tree Diseases: Gall Producers

Gall diseases are common on many trees and shrubs. Galls are abnormal swelling growths that form on the leaves, twigs, branches, roots, and flowers of…

Tree Diseases: Galls on Plants

Introduction Galls are abnormal swelling growths that occur on the leaves, twigs, branches, roots, and flowers of plants. A gall’s characteristics are determined by its…