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Protect Your New Trees From Sun Scald

Protect Your New Trees From Sun Scald

Sun scald is characterized by elongated, sunken, dried, or cracked areas of dead bark, usually on the south or southwest side of a tree. On cold winter days, the sun can heat up bark to the point where cambial activity is stimulated. When the sun is blocked by a cloud, hill, or building, bark temperature drops rapidly, killing the active tissue.

Young trees, newly planted trees, and thin-barked trees (cherry, crabapple, honey locust, linden, maple, mountain ash, plum) are most susceptible to sun scald. Trees that have been pruned to raise the lower branches, or transplanted from a shady to a sunny location are also sensitive because the lower trunk is no longer shaded. Older trees are less subject to sun scald because the thicker bark can insulate dormant tissue from the sun’s heat ensuring the tissue will remain dormant and cold hardy.

Sun scald can be prevented by wrapping the trunk with a commercial tree wrap, plastic tree guards, or any other light-colored material. The wrap will reflect the sun and keep the bark at a more constant temperature. Put the wrap on in the fall and remove it in the spring after the last frost. Newly planted trees should be wrapped for at least two winters and thin-barked species up to five winters or more.


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  • Tyler Johnson
    September 12, 2019, 9:14 am REPLY

    I’m glad that you mentioned that some trees have thinner bark than others. I feel like it would be good to know if they are vulnerable to sunscald from thin bark so that you could protect them. I’ll have to consider getting some to look at my trees to let me know if I need to protect them.

  • Stanley Thomas
    October 1, 2020, 2:09 am REPLY

    What is that thing you took off that you used to train the tree to stand straight?


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