s 



CIRCULAR 10 6, U. S. DEPARTMENT OF AGRICULTURE 



The three species most common in orchards of the Pacific North- 

 west may be distinguished as follows : The buffalo tree hopper, Geresa 

 huhalus (fig. 1, A) is the largest of the three and has projecting: 

 pronotal horns. The dark-colored tree hopper, 0. lasalis (fig. 

 1, C), is the smallest of the three species and also has pronounced 

 pronotal horns, but it is darker generally and black ventrally. with 





Figure 6. — Oviposition wounds of the dark-colored tree hopper : A, In pear ; 

 B. in willow ; C, in peach ; D, in locust ; E, in apple. Natural size 



short hairs on the pronotum, especially in front. The green-clover 

 tree hopper, Stictocephala inermis (fig. 1, B), has no pronotal horns. 



LIFE HISTORY OF TREE HOPPERS 

 HATCHING OF EGGS 



Hatching starts in early April for most species and continues 

 until early May. The eggs of the dark-colored tree hopper (fig. 



