. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. i]6 ECONOMIC ENTOMOLOGV S«n Joti Scale {Aspidiotus pernkiosus Comst.).âChina is probably the home of this scale. It became cstablishd at San Jos£, Cal., aboui 1870, and was intro<luced into Kastern nurseries in the U. 8. aboui i88fr-7, and into Oniario about i8<;6. Occurs on orchard tree~ bush fruits, and many perennials and annuals. On bad
. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. i]6 ECONOMIC ENTOMOLOGV S«n Joti Scale {Aspidiotus pernkiosus Comst.).âChina is probably the home of this scale. It became cstablishd at San Jos£, Cal., aboui 1870, and was intro<luced into Kastern nurseries in the U. 8. aboui i88fr-7, and into Oniario about i8<;6. Occurs on orchard tree~ bush fruits, and many perennials and annuals. On badly infestol branches the scale presents the appearance of dark-grey scurfy patche~, and on fruit there is often a purplish discoloration about the scale. Adult.âThe female scale is circular, !,i inch in diameter, with ,1 central exuvium surrounded by a yellowish ring. The male scale ^. Fig. 78.âa. Winged San Jos^ scale (much enlarged); b, young scale insect (enlar,"! 125 times). oval, twice as long as broad, v't' , ' \w 1 exuvium showint; a nipple toward the small end of the .'â Tose scale winter^ in the half-grown state. Early in ;; i. !!(;⢠11 males appear, ami the females resume growth. The male moults thrice and the femalt twice. In early June the females begin to produce living young. Tho period of production lasts about six weeks during which time e:nh female produces on an average 400 young. The females mature in .^5 to 40 days, and the males in about 25 days after their birth. Thi-re are three or four broods in northern orchards (Figs. 77 and 78). Nymphs.âThe half-grown scale is black, and shows a central nipple surrounded by one or two depressed rings. Parasites.âThe following Lady-birds feed on the San Jose Si lo: ChilocoTus bivulnerus, Peniilia 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 illustrati
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectentomology, bookyear1
