26 



CIRCULAR 270, U.S. DEPARTMENT OF AGRICULTURE 



the period from July to September and hatch the following April or 

 May. The young, or nymphs, drop to the ground and feed chiefly 

 on alfalfa, where they are most often found in the center of the crowns. 

 Growth is completed in July. The adult insects are about three 



Figure 29.— A, Buffalo tree hopper; B, green clover tree hopper; C, dark-colored tree hopper. 



Three times natural size 



eighths inch long, grayish or greenish, and triangular, and the com- 

 moner species have projecting pronotal horns, suggestiag the appear- 

 ance of a buffalo. 



CONTROL 



Clean cultivation is the most obvious and practical control method 

 and should be practiced in young orchards whenever possible. As 



