compound applied to tree wounds or pruning cuts.

wound dressing (Wikipedia)
An adhesive island dressing, in its original packaging (left) and on a person's wrist (right).

A dressing is a sterile pad or compress applied to a wound to promote healing and protect the wound from further harm. A dressing is designed to be in direct contact with the wound, as distinguished from a bandage, which is most often used to hold a dressing in place. Many modern dressings are self-adhesive.

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