Insect and Fungous Enemies of the Grape. 21 
LIFE HISTORY. 
The beetles appear early in. June, the date varying according to 
locality and season. Soon after mating feeding begins and continues 
for from 3 to 4 weeks. Eggs are deposited singly a few inches below 
the surface of the soil and hatch in two or three weeks. The young 
grubs feed on the tender 
rootlets of grasses and other 
vegetation and _ become 
nearly full grown by fall. 
With the appearance of cold 
weather they go deeper in 
the. soil, each larva forming 
a hibernation cell, where 
they remain until spring, 
when they go near the sur- 
face and may feed more 
or less. In April or in early 
May or later, according to 
latitude, the grubs change 
to pupe, and finally adults, 
about the time the grapes 
are in bloom. There is but 
one generation of the insect 
each year. 
CONTROL. 
Experiments made by the 
Bureau of Entomology in 
the grape belt of the Lake 
Erie Valley indicate that 
considerable protection of 
vineyards from rose-chafer 
injury may be obtained by 
timely and thorough use of 
arsenical sprays, the amount 
of benefit varying with the 
abundance of the insects. 
Since the use of poison 
sprays at the time of rose- 
chafer invasion is desirable Fic. 20.—The rose-chafer on grape blossom 
for the control of other eae nee ae ae 
grape pests, such as the grape-berry moth, grape flea-beetle, and root- 
worms, vineyards in sandy regions and subject to rose-chafer attack 
should be sprayed regularly for this insect as a part of the routine 
of vineyard spraying. 
