File:The San Jose scale and its control (1910) (14587377628).jpg

Identifier: sanjosescaleitsc2124quai (find matches)
Title: The San Jose scale and its control
Year: 1910 (1910s)
Authors: Quaintance, A. L. (Altus Lacy), 1870-1958 United States. Dept. of Agriculture United States. Bureau of Entomology
Subjects: San Jose¿¿ scale Control San Jose¿¿ scale
Publisher: Washington, D.C. : U.S. Dept. of Agriculture, Bureau of Entomology
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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Fig. 2, Appearance of an apple orchard badly infested by the San Jose scale; many of the limbs andbranches killed. (Original.) will present an ash-gray appearance, and on closer examination will be found thoroughly incrusted with the scales, which, when scraped with a knife, will produce a yellowish, oily fluid. When the scales are abundant on the tree the foliage also will be thoroughly infested, giving it a spotted and diseased appearance readily observable some feet away. NATURAL HISTORY AND HABITS. The San Jose scale passes the winter in an immature conditionfixed to the bark of the host plant, the small, dark-gray or blackishscales being just discernible with the unaided eye. In early spring, (Cir. 1241 with the ascent of the trees sap, the growth of the scale begins,and early in April in the latitude of Washington the small two-winged, active males issue from the male scales. After mating with
Text Appearing After Image:
Fig. 3.—Appearance of the San Jose scale, enlarged about i times; to the right, on peach ; to the left, on apple. (Original ) the females the males die. The females continue to grow and inabout a month begin the production of living young—minute, yellow,oval creatures, which by very close observation may be distinguished (Cir. 124) without the aid of a hand lens, crawling here and there on the in-fested plants in an effort to find a suitable place for settlement. Theyoung insect is active for some hours but soon settles, pushes itsslender, threadlike beak into the plant, and begins to feed by sucking-out the sap. After this there is no further movement from place toplace, and the waxy covering, which often begins to develop beforethe insect has settled, soon covers it completely. In about twelve days the insects molt and from this time on themale and female scales may be readily distinguished. Eight or tendays later the males change to pupa3, and in from twenty-four totwenty-six d

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