66 INSECTS AFFECTING THE PEAR. 



be detected. When this happens they should be care- 

 fully cut out with a sharp knife. Painting the bark 

 with the soft soap and carbolic acid mixture men- 

 tioned on page 20 is also recommended. 



INJURING THE BRANCHES. 



The Scurfy Bark-louse. 



( 'hionaspis fur/urns. 

 During the winter months the bark of pear and 

 apple trees is frequently more or less covered by 

 small, flattened, whitish, oval scales (Fig. 27), beneath 

 which are numerous minute purple eggs. These are 

 the scales of the female Scurfy Bark-louse, an insect 

 that seems to be more destructive in the Southern 

 and Central States than at the North. It is probably 



Fig. 27. Twig infested by Scurfy Bark -louse. 



a native of America, having been known to the ear- 

 liest American entomologists, and is supposed to 

 have fed on wild crab apples before the introduction 

 of improved fruit trees. The scales of the male louse 

 are much narrower than those of the female 



During May or June the eggs beneath these scales 

 hatch into small, purplish or reddish-brown lice, that 

 crawl about over the bark for a few da vs. ami finally 



