frill girdle

A girdle made on a stump or tree to be killed by herbicide. A series of downward cuts are made through the bark and into the region of the vascular cambium or outer sapwood, and at each cut the peripheral tissues are levered outward creating the frill, with a channel between it and the sapwood.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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