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Almond - San Jose Scale

Direct copy from UC IPM website to word document Statewide IPM Program, Agriculture and Natural Resources, University of California All contents copyright © 2009 The Regents of the University of California. All rights reserved. There is no visible egg stage with this insect; the scales emerge as mobile nymphs. Crawlers are bright yellow and tiny (about the size of the sharp end of a pin), with well developed eyes, antennae, and legs. After locating a feeding site, the crawler settles, begins feeding, and looses its antennae, legs, and eyes, becoming immobile. They soon begin to secrete a waxy substance that covers the body. Initially the waxy covering is white (white cap), but turns darker later in the first instar black cap). Male scales have a more elongated covering than the females; males molt four times, whereas females have a rounder cover and molt twice. The male emerges as a winged adult and the female remains wingless under the scale covering. There are three to four generations per season taking about 7 to 8 weeks per generation.

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