Scale

Armored scale feeds on the sap of twigs and branches in Western Washington ornamental plants, with small reddish areas developing around feeding sites and extending internally. Infested plants lose vigor with thinning and yellowing foliage. Young scales are difficult to distinguish from twigs, but careful inspection reveals clustered circular coverings.

Monitor in early spring when crawlers emerge and are most vulnerable. Apply horticultural oil or soap targeting immatures; timing to correspond with emergence maximizes effectiveness. Prune heavily infested branches to reduce pests. Maintain plant health to support recovery.