Common Urban Tree Problems
Girdling:
This problem is a result of roots growing in a circular direction. Root girdling can result in a weak support system for the tree. The lack of trunk flare at the base of the tree where it enters the ground is an indication of girdling.
Improper Pruning:
Pruning done improperly or at the wrong time can cause problems in urban landscapes. Leaving stubs, or flush cutting branches, can lead to cankers and frost cracks that greatly reduce the health and longevity of your tree.
Lawn Mower Blight:
This phrase is commonly used by City foresters to describe tree damage caused by lawn mowers bouncing off the base of young, smooth-barked trees. This injury can cause a canker that can slowly move throughout the trunk and eventually kill the tree. You can prevent this problem by placing shredded hardwood mulch in an area with about a five-foot or greater diameter around the base of the tree.
Planting Too Deep:
Trees planted too deep never get fully established. They tend to grow slowly, become less resistant to insects and disease, and eventually die.
Use of Plastic Weed Barrier:
Coarsely-woven landscape fabric keeps weeds down and, unlike plastic, still lets moisture penetrate evenly throughout the root system. Organic mulch without a weed barrier is best for plant health, but if rock is used for a mulch, landscape fabric is best for letting moisture through.
Use of Wound Dressing:
Many people still use wound dressing (pruning paint) on their trees, but research shows that tree wound dressing actually inhibits wound wood (callus) from forming correctly. However, if oaks are wounded in April, May, or June, wound dressing may help prevent the insect that can carry the oak wilt fungus from transferring the disease to your oak tree.
