32 FARMERS BULLETIN 804. 



GRAPE APHIDS ATTACKING THE FOLIAGE. 



The well-known grape phj^lloxera occurs in some localities upon 

 grape foliage (fig. 23), but this species is not treated in this bulletin, 



Fig. 23. — Galls of grape phylloxera {Phylloxera vitifoliae) on grape 

 leaf. (Original.) 



since it is injurious principally to the roots and requires control 

 measures radically different from those employed against foliage-in- 

 habiting species. 



