312 PESTS OF ORCHARD AND SMALL FRUITS 
quickly, and flies readily. Attack by it is most noticeable in Sep- 
tember. The nymphs look like the adults, except that they are smaller 
Fic. 478.— Work of the Grape Leaf-hopper. Original. 
and have no wings. Both adults and nymphs feed on the under sur- 
face of the leaves. 
The adults leave the grape in October and migrate to neighboring 
vegetation. They overwinter in dead, fallen leaves, clumps of grass, or 
any similar protection. In spring they feed first on weeds, then 
migrate back to the grapes 
and feed on the young shoots 
and leaves. Eggs are laid in 
the tissue of the grape leaves 
in June and July. Nymphs 
emerge shortly, and are numer- 
ous in July and August. The 
nymphs do not hop or fly, 
merely running around over 
the leaves. There is one gen- 
Fic. 479.— The Grape Leaf-hopper. En- 
larged and natural size. Original. 5 
eration each year. 
Cleaning up rubbish in the vineyard is only of nominal value, since 
the adults migrate in October to neighboring hiding places. The best 
