San Jose scale

San Jo·se scale

noun \ˌsa-nə-ˈzā-, ˌsan-(h)ō-\

Definition of SAN JOSE SCALE

:  a scale insect (Quadraspidiotus perniciosus) probably of Asian origin that is naturalized in the United States and is destructive to fruit trees


San Jose, California
First Known Use: 1887

San Jose scale

noun    (Concise Encyclopedia)

Species (Aspidiotus perniciosus) of scale insect first discovered in North America at San Jose, Cal., in 1880 but probably a native of China. A waxy gray secretion (the scale) covers the yellow females, which are about 0.06 in. (1.5 mm) in diameter. The scale is elevated in the center and is surrounded by a yellow ring. The female produces several generations of living young each year. San Jose scales can completely cover tree branches and may eventually kill the tree.


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