Forbes scale

Forbes scale

Quadraspidiotus forbesi (Johnson)

Hemiptera: Sternorrhyncha: Diaspididae

Distribution: Most fruit-growing states and provinces in eastern North America.


Round or elongate gray scale with a raised reddish area in the center (A, B), which distinguishes it from the San Jose scale (Quadraspidiotus perniciosus).

  • Crops Affected: Apples, Cherries, Pears, Plums

    Damage

    Attacks cherry, apple, apricot, pear, plum, and quince. Masses of gray, thin, flaky scales occur on the bark of the trunk and branches, sometimes completely covering it (C). Crawlers make their way to fruits, where their feeding produces small red spots about 3 mm in diameter with a light-colored area in the center.

    Management

    Spray a delayed dormant oil when buds are showing green tissue but before pink bud. Insecticide applications may be made to control newly hatched crawlers in early summer.

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