Use sprays of acephate, malathion, Sevin, or rotenone. The insects can also be dislodged with high pressure water spray from the garden hose. Feeding by mites causes yellowish or stippled leaves. If the infestation is heavy, fine webbing may be seen. Use sprays of rotenone.
Euonymus scale appears as white flecks on the leaves and stems.
Several other scale insects attack euonymus. Dormant oil sprays kill overwintering stages. Or use Sevin, malathion or acephate to control crawlers. The preferred method of control involves regular inspection for early detection of the infestation and then spraying with dormant oil. Visuals associated with this text.