Scales

Scales are a diverse group of sucking insects that are common pests of ornamental trees and shrubs. These insects vary considerably in color. They can be black, brown, green, gray, orange, yellow, red, or white. Scale is difficult to control. The life stage most susceptible to insecticides is the crawler stage, which typically appears in the Spring. Crawlers can be controlled by oils and contact insecticides, but successful control depends on precise application timing. Scale nearly always act stressed plants.