I then adjusted C5 and re-tested the thenar eminence - it was fine, elicited no pain, and her hand stopped tingling. I finished treating her and told her to return in two days. At the second visit, I tested the thenar eminence).
Pruning Your Boxwood. 1  1. Know when to prune your tree. Prune boxwood shrubs at any time between the last expected spring frost and six weeks prior to the first expected fall frost. 2  2. Use sharp bypass pruners to trim off dead, injured or diseased branches. Prune them off all the way to the base of the branch.
Boxwood bushes infested with this pest generally have reduced vigor as well. Non-Chemical Control Planting boxwood bushes that are less susceptible to the boxwood leafminer is one way to prevent infestations. Slower growing boxwoods such as the English boxwood, Pendula and Suffruticosa are somewhat resistant to this pest.