Shade Tree Decline Control 1. Attempt to determine stresses associated with the growing site and alleviate them if possible. Early recognition is important. 2. Water thoroughly during dry periods. Water over several hours using a slow running stream of water from a hose. Move the hose periodically to distribute the water over the entire root area. Mulch soil over the roots of the tree; do not pile mulch against the trunk. 3. Avoid site disturbances, like soil compaction, as well as injuries to the trunk, roots, and branches. Construction or trenching activities must avoid tree root injury. Tree roots extend outward to a distance about equal to the height of the tree. 4. Apply a fertilizer if needed based on soil test and tree growth needs. Applying nitrogen fertilizer to a declining tree will often make the situation worse. 5. Prune out dead wood. Do not top the tree. 6. Correct minor nutrient deficiencies like iron chlorosis (yellowing due to deficiency). 7. Correct girdling root problems if detected.
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