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A Threat to Apple Industry. San Jose Scale Quadraspidiotus perniciousus (comstock) Homoptera: Diaspididae -A Key Pest of Apple Orchard of Kashmir
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San Jose scale is a key pest in almost all the fruit growing districts of the United States. It was introduced to California from China on flowering peach in the early 1870s and soon became a serious pest in the San Jose area. By the late 1890s it had spread to all parts of the United States.
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