6 Farmers’ Bulletin 1220. 
som clusters, while those emerging after the blossoms are shed ovi- 
posit mostly on the clusters of young grapes. The minute scale-like 
eggs of the first brood are difficult to find, as they are relatively 
scarce, but they may be readily detected during the late summer and 
fall as glistening white spots on the surface of the green or ripening 
berries. oe of the first brood feed upon the blossoms, webbing 
them together, and by their injury pr oducing a more or less irregular 
bunch of grapes, or the 
clusters may be almost en- 
tirely destroyed. This 
brood, however, is usually 
small, because of the heavy 
mortality of the insects 
during the winter. 
After feeding about three 
weeks the larve attain full 
growth (fig. 4), go to the 
Fic. 3.—The aduit grape-berry moth. Enlarged. leaves and cut loose a 
small portion which is 
folded over against the leaf surface (fig. 2), and under this flap a 
cocoon is made where the pupa stage is passed (fig. 5). In the 
northern grape-growing areas most of the first or spring brood of 
pup develop to moths the same season, but a few may remain in 
this stage until the following spring. In the Erie-Chautauqua and 
northern Ohio grape areas moths of the second, or summer brood, 
begin to appear about the middle of July, emergence continuing well 
into the fall, with a heavy 
emergence during normal 
seasons the latter part of 
July. The summer brood 
of larve with the later ap- 
pearing individuals greatly 
exceed in numbers those of 
the spring brood and at- 
tack the berries almost ex- 
clusively, feeding on the 
pulp and seeds, passing 
from one grape to another 
in the course of their feeding (fig. 6). When full grown the larve go 
to the leaves and construct cocoons under a leaf flap, where the pupa 
stage is entered and the winter passed. Usually the older leaves are 
chosen by the larva, and as a result the pup are most abundant on 
the earlier dropped leaves under the trellises. These leaves later 
become more or less covered with other leaves and trash, which act as 
a protective covering, much enhancing the chances that the pupe 
will go through the winter safely. 
Fie, 4.—Larva of the grape-berry moth. Enlarged. 
