594 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



much smaller, and with but one cast skin at the anterior end, as 

 shown in the same figure. 



Life History. If one of the female scales be turned over during 

 the winter, numerous oval, white eggs will be found under it, 

 with the shriveled body of the female insect tucked away at the 

 anterior end. These eggs hatch a week or two after the apples 

 blossom, producing small yellowish insects, which look like mites 

 as they crawl over the bark, which they often give a yellowish 



FIG. 448. The oyster-shell scale: a, adult male; b, foot of same; c, young 

 nymph; d, antenna of same; e, adult female taken from scale a, c, 

 e, greatly enlarged, b, d, still more enlarged. (After Howard, U. S. 

 Dept. Agr.) 



tinge where very abundant. The young insect is of microscopic 

 size and is shown greatly enlarged in Fig. 448, c. It settles down 

 after a few hours' wandering and begins sucking the sap from 

 the bark. In a day or two long, white waxy filaments exude 

 from over the body, which soon mat down and form the 

 protecting scale, to which the cast skins are added when the 



