. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 126 ECONOMIC ENTOMOLOGY San Jose Scale {Aspidiotus perniciosus Comst.).—China is probably the home of this scale. It became estabhshed at San Jose, Cal., about 1870, and was introduced into Eastern nurseries in the U. S. about 1886-7, and into Ontario about 1896. Occurs on orchard trees, bush fruits, and many perennials and annuals. On badly infested branches the scale presents the appearance of dark-grey scurfy patche
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 126 ECONOMIC ENTOMOLOGY San Jose Scale {Aspidiotus perniciosus Comst.).—China is probably the home of this scale. It became estabhshed at San Jose, Cal., about 1870, and was introduced into Eastern nurseries in the U. S. about 1886-7, and into Ontario about 1896. Occurs on orchard trees, bush fruits, and many perennials and annuals. On badly infested branches the scale presents the appearance of dark-grey scurfy patches, and on fruit there is often a purplish discoloration about the scale. Adult.— female scale is circular, ^-'5 inch in diameter, with a central exuvium surrounded by a yellowish ring. The male scale is. Fig. 78.—a, Winged San Jose scale (much enlarged); b, young scale insect (enlarged 125 times). oval, twice as long as broad, with a long dark exuvium showing a nipple toward the small end of the scale. The San Jose scale winters in the half-grown state. Early in spring the winged males appear, and the females resume growth. The male moults thrice and the female twice. In early June the females begin to produce living young. The period of production lasts about six weeks during which time each female produces on an average 400 young. The females mature in 35 to 40 days, and the males in about 25 days after their birth. There are three or four broods in northern orchards (Figs. 77 and 78). Nymphs.—The half-grown scale is black, and shows a central nipple surrounded by one or two depressed rings. Parasites.—The following Lady-birds feed on the San Jose Scale: Chilocorus bivulnerus, Pentilia misella and P. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lochhead, William, 1864-. Philad
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
