PUNCTURING THE TWIGS 



253 



Injured twigs may be removed in early spring 

 or in the course of winter pruning. 



The Buffalo Tree-hopper {Ceresa huhalus Fab.) 



The twigs and smaller limbs of orchard trees 

 sometimes show regular rows of oval scars, due 

 to the egg-laying 

 punctures of a 

 curious little in- 

 sect, the buffalo 

 tree-hopper. The 

 scars do not heal, 

 and, if numerous, 

 weaken the twigs. 



The insect that 

 makes the punc- 



FiG. 343. — Work of 

 Buffalo Tree-hop- 

 per. Original. 



Fig. 344. — Work 

 of the Periodical 

 Cicada. Original. 



Fig. 342.— The Buffalo Tree- 

 hopper. Enlarged and natu- 

 ral size. Original. 



tures is triangular in shape, 

 Ught green in color, three 

 eighths of an inch long, and 

 has a two-horned enlarge- 

 ment at the front of its body. 

 The young that hatch from 

 the eggs do not feed in or on 

 the twig, but on various weeds. 



In control, weeds should be kept down in the 

 orchard, and twigs that show many of the egg-lay- 

 ing slits may be pruned in winter. 



The Periodical Cicada {T ibicen septendeciin Lmn.) 



Occasional injury to twigs of fruit trees is re- 

 corded due to egg-laying punctures of the periodi- 

 cal cicada. This insect is closely related to the 

 '' dog-day cicada," or " locust," which is heard 



