Dogs Biting Branches Can Kill Arborvitae. To check tip miners, shake the branches in early spring and see whether moths fly out of the brunches. I have tried various commercial products to keep them away.

This isn't a terribly common problem on this hugely popular screening. Discard the cut branches away from other trees or plants; Some trees, such as the northern white cedar (thuja occidentalis, thriving in u.s.