Woolly alder aphids require both alder and silver maple to complete their life cycle.
Control of this pest on alder is rarely employed because alder is not used as a landscape plant, and predators, such as lacewings and lady beetles, may keep this pest below damaging levels. Infested silver maple trees may become so large that control measures are expensive.
Chemical controls include malathion, Bayer Advanced Tree and Shrub Insect Control, insecticideal soaps, and horticultural oils.
