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corrective pruning to maintain the health of the tree should include removing dead, damaged or diseased wood to encourage rapid healing and reduce the incidence of insects and disease. On some species it may be necessary to remove excessive growth which restricts air movement and light.
Certain recommendations regarding pruning practices have changed significantly in recent years. Tree care specialists have traditionally recommended the use of a layer of protective wound dressing such as tar, asphalt, latex, or oil paint or various materials containing a fungicide.
But Alex Shigo, a research pathologist with the U.S. Department of Agriculture in Durham, N.H., has shown through many years of research that this neither speeds wound’s healing nor protects the tree from fungal invasion. In fact, moisture sometimes is trapped behind the dressing, providing an ideal environment for fungal growth that retards the healing process, according to the pathologist.
Shigo’s work also has led to improved recommendations for the removal of large branches from a tree.
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