54 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
HABITS OF THE ADULT. 
About the middle of June, just before the blossom-buds of the 
grape break into full bloom (fig. 16), the adult rose-chafers com- 
mence to appear upon the vines. They at once proceed to attack the 
blossom clusters and injure the unexpanded blossom-buds by cutting 
a hole through the side of the 
bud and eating out or injuring 
the small ovary. (See fig. 17.) 
Since the blossom-buds are quite 
small, a single beetle will destroy 
a large number of blossoms, and 
if the beetles are at all numerous 
almost the entire crop may be 
destroyed. Sometimes in badly 
infested vineyards the blossom 
clusters will be swarming with 
a squirming mass of beetles (fig. 
Fic. 16.—Condition of the grape blossom- 
buds at the time the rose-chafer (Mac- 
rodactylus subspinosus) first appears, 
and when the first poison spray should 
be applied. Enlarged. (Original.) 
18, f) and the whole cluster will 
be quickly reduced to a frayed 
and blackened mass of broken 
Fic. 17.—Work of the rose-chafer: a, In- 
cae: jury to grape blossom-buds by feeding 
and injured blossom-buds. Our of rose-chafer; b, injury to the ovary 
resulting in the destruction of the berry. 
ybservations le: Ss lieve : 
observations lead us to believe codvis enieeesd ose 
that by far the greater percent- 
age of injury to the grape crop is done previous to the opening of the 
blossom-buds and to a less extent while the grapes are actually in 
bloom and for a few days succeeding the blooming period. (See fig. 
19.) Later, when the injured blossom-buds and berries have dropped, 
