Males typically outnumber females. With a heavy infestation, clusters of white males can be easily seen on leaves and stems. Initial symptoms of euonymus scale infestation are yellow spots on leaves. With a heavy infestation, branches and possibly the entire plant may die. Consider using these in new plantings.
Euonymus scale is difficult to control.
With light infestations, scale can be scraped off by hand and destroyed. Pruning out heavily infested branches is helpful. Avoid using insecticides unless the plant is very valuable and in serious danger from scale. Insecticides will often kill the naturally occurring enemies of scale. Adult scales are relatively protected from insecticides by their waxy covering.