BULLETIN 192. INSECTS INJURIOUS TO THE VINE. 139 



KEY FOR DETERMINING THE INSECT INJURIES TO THE VINE 

 DESCRIBED IN THIS BULLETIN. 



Injury to the Leaves. 



No part of the leaf eaten away, but having pale spots, or being 

 entirely pale yellow, or dried up, those about the crown of the vine, 

 particularly the lower ones, worst affected. Vine hopper, page 111. 



Leaves with irregular holes eaten out. Flea beetles, page 128; Grass- 

 hoppers, page 122; or Leaf chafers, page 132. 



Leaves with regular chain-like slits eaten away. Root beetles, page 116. 



Leaves rolled up from one side. Leaf rollers, page 129. 



Leaves entirely devoured. Army worms, page 124; Grasshoppers, 

 page 122; Hawk moth larvss, page 119. 



Leaves with swellings on upper surface, and grayish white to dark, 

 brown felt covering on corresponding depressions on under side. Erinose, 

 page 134. 



Injury to Petioles and Pedicels. 



Narrow strips of uniform size eaten away. Root beetle, page 1 16. 



Injury to the Berry. 



Narrow strips about one fourth of an inch long gouged out. Root 

 beetle, page 116. 



Clusters cut off and dropped to ground. Army worm, page 124. 



Injury to the Roots. 



Long strips of the bark eaten away. Root beetle, page 116. 



The smaller rootlets only eaten of!'. Wire worm, page 133. 



Nodosities or swellings, largest on smaller roots, often at extreme tip, 

 decay of hypertrophied tissue. Phylloxera, page 99. 



Nodosities or swellings largest on larger roots, two or three times the 

 diameter of those caused by phylloxera, and of firmer consistency, 

 none at extreme tip. Nematodes, page 136. 



Injury to the Whole Vine. 



These are the same as under root injury, since injury to the roots 

 affects the vine as a whole. 



Vines whose canes are checked in growth or completely stunted, and 

 if leaves have chain-like strips eaten out. Root worm, page 116. 



