Cankers can coalesce to M smaller shrubs within a year. It may take a few years for a larger tree to be completely girdled. In young trees, the infection often starts on the trunk-there is no chemical treament so the tree should be removed at that time. Lesions on older trees tend to form in the branches, especially when the trees are crowded together. In these cases pruning out the affected branchbelow the canker may suffice.
Prevention is the key, using cultural techniques such as watering and proper spacing of plants.
Help clients understand the importance of weekly slow, deep watering for trees and shrubs that have been 'm the ground less than three years. Where water supply allows, apply the equivalent of one inch rainfall, or enough to moisten the soil 4-6 inches deep. John C. Nye, Dean and Director. Distributed in furtherance of Acts of Congress of May 8 and June 30, 1914. It is the policy of the Delaware Cooperative Extension System that no person shall be subjected to discrimination on the grounds of race, color, sex, disability, age, or national origin.