15 



It infests practically all kinds of deciduous fruit trees and 

 if unmolested is liable to kill them. It was introduced into 

 California from Chili about 1870, since when it has spread over 

 a large portion of the Pacific slope ; and has lately appeared in 

 the eastern states, where it threatens to do much damage. 



Mr. L. O. Howard describes the San Jose Scale as " per- 

 fectly round, or at most very slightly elongated or irregular. It 

 is flat, pressed close to the bark, resembles the bark of the 



Fig. 10. San Jose Scale: a. pear, moderately infested — natural size; b, 



female scale — enlarged. 



twigs in color, and when fully grown is about one-eighth of an 

 inch in diameter. At or near the middle of each scale is a 

 small, round, slightly elongated black point ; or this point may 

 sometimes appear yellowish. When occurring upon the bark 

 of the twigs or leaves and in large numbers, the scales lie close 

 to each other, frequently overlapping, and are at such times 



