Answer: What you describe sounds like euonymus scale, an insect pest that feeds by sucking the fluids out of the tissues of the plant. They are difficult to control once established so if pruning out the affected branches is an option, that's what I would recommend. Horticultural oil will suffocate the pests but will also harm the foliage on your evergreen euonymus so you will have to apply it carefully and only to the insect pests, not to the leaves. There may be other ways to control the pests. Why not take a sample of the problem to your local Master Gardener clinic for positive diagnosis and control strategies? Contact Pierce County Cooperative Extension there in Tacoma for office hours or clinic locations. Best wishes with your shrubs!
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