SOME INSECTS INJURIOUS TO ORCHARD FRUITS 539 



scale itself is merely a waxy covering secreted by the insect 

 beneath. The scale of the male is smaller and somewhat elongated, 

 the nipple being at the larger end. 



Injury by this species was first noticed near San Jose, Gal., 



FIG. 390. Peach twigs infested with the San Jose scale. On the twig at 

 the right a scale has been turned back showing the female insect 

 enlarged. (After W. E. Britton.) 



about 18SO, where the scale was most destructive and was investi- 

 gated by Professor J. H. Comstock, who first described it. About 

 1887 it was brought east on Japanese plum trees secured by 

 Eastern nurseries and was distributed by them on young trees, 



