10 Farmers’ Bulletin 1220. 
vicinity of Westfield, N. Y. It has since been found rather generally 
over the Erie-Chautauqua grape belt, and in 1919 was present in in- 
jurious numbers in certain vineyards in the vicinity of Sandusky, 
Ohio. It is likely to spread gradually over the country except as 
limited by climatic and other factors. Early varieties of grapes, 
such as Moore Early and Worden, are most subject to attack, whereas 
the Concord, Niagara, and other later blooming sorts principally 
grown in the commercial grape districts in the East, largely escape 
injury. This insect is a near relative of the gall-making gnats or 
midges discussed under the caption of “Fly  gall-makers” 
(pp. 30-33). 
Fig. 9. 
Grape berry infested by larva of grape curculio. Considerably enlarged. 
LIFE HISTORY. 
The damage is done by the larve or maggots, which infest the 
unopened buds, causing these to shed, and thus thinning the bunches 
of grapes. Infestation is indicated by the enlarged size of the buds 
which often become two or three times larger than uninfested ad- 
jacent buds (fig. 10). The number of larve in a given bud will 
vary greatly from a few to as many as 70, and the destruction of 
buds may reach as high as 60 per cent. 
In the Erie-Chautauqua region, the adult fly or midge comes from 
the ground the latter part of May, at which time the blossom buds 
of early varieties are more or less spread at the apex. By means of 
a long flexible ovipositor, the female places its eggs within the buds, 
and in a few days these hatch into whitish maggots. After about 
two weeks of feeding the maggots are grown, at which time they 
are mostly of an orange or reddish color. The buds are then deserted, 
