APPLE INSECTS — liOREliS AND MISCELLANEOUS 211 



The Snowy Tree-cricket 

 (Ecanthus niveus De Geer 



Apple and plum trees, especially if growing in orchards 

 overgrown with weeds and other rank vegetation, are liable to 

 be injured to a slight extent by the egg punctures of this pale 

 yellowish-white tree-cricket. This species {niveus) was for- 



FiG. 195. — A pair of snowy tree-crickets courting, the male with wings expanded. 



merly supposed to deposit its eggs in rows of punctures in rasp- 

 berry canes, but recent work at the Geneva Experiment Station 

 has shown that another species {nigricornis) is the real cause 

 of the injury to raspberry and that niveus deposits its eggs 

 singly in punctures in the bark of the smaller branches of apple, 

 peach, plum and other trees (see p. 325). The egg-punctures 

 often permit the entrance of fungous spores and bacteria which 

 cause the surrounding bark to become diseased, and produce 

 discolored areas of dead bark known as cankers, or woolly 

 aphids may start a colony at the wound and cause a bad scar on 



