Willow trees (Salix spp.) are fast-growing beauties that make attractive, graceful ornamentals in a big backyard. In the wild, willows often grow by lakes, rivers or other bodies of water. Although willows are not sickly trees, a few diseases and pest infestations do attack and cause willow tree problems. If willow tree bark is falling off, you may need to take action.
Common Willow Tree Problems
Willows are not picky trees and most thrive in almost any kind of soil as long as there is adequate sunlight. They grow best in sites with full sun. However, the tree is vulnerable to several diseases and pests, including a few that cause willow tree bark peeling.
A few of the most serious willow tree problems do not cause peeling willow bark. These include infestation by gypsy moth caterpillars, willow leaf beetles and bagworms that will defoliate the tree.
The worst willow diseases include:
- Crown gall, which causes stunting and dieback
- Willow scab, which causes olive green spore masses along the underside of leaves
- Blank canker, causing dark brown spots on the tree’s leaves.
These are not your tree’s problem if your willow tree bark is falling off.
Reasons for Peeling Bark on Willows
Peeling willow bark can be caused by insects. If your willow tree bark is falling off, it could be a sign of borer insects. Both poplar and willow borers can tunnel through the inner layer of the willow bark. This causes peeling bark on willows.
Your best bet if your willow tree has borers is to clip out all diseased branches. Then you can spray the willow tree with permethrin to kill borers.
Another possible reason for willow tree bark peeling is too much sun. Willows most often get sunscald in winter when sun reflects off bright snow. The sunlight heats the tree bark, causing the tree cells to become active. But as soon as the temperatures plunge, the cells freeze and rupture.
If your willows have yellow or red patches on the tree trunk, this may be the result of sunscald. Those spots can also crack and peel as time passes.
The tree will heal from sunscald, but you can protect your wills by acting before winter. Paint the trunks with diluted, white paint in early winter to prevent sunscald.