Nymphs hatch in the spring as new leaves appear. There are two generations per season. Damage appears as yellow spotting on leaves. Severe feeding may result in deformed leaves and possibly defoliation. Control is justified when leaf injury is easily found throughout the canopy.
Damaged leaves turn brown and drop early, especially during dry weather.
Two generations occur each year. Scale Insects Female scale insects have a protective covering of wax that is secreted from their bodies. The eggs are laid under the protective scale covering. Once the insects are under the protective covering, most insecticidal applications are ineffective. Heavy scale infestations weaken the trees or shrubs.