THE ROSE-CHAFER. 7 
USE OF ARSENICALS ON GRAPES AND OTHER FRUITS. 
Experiments made by the Bureau of Entomology in the grape 
belt of the Lake Erie Valley during 1910-11 indicate that a con- 
siderable degree of 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 for the control of other grape pests, such as the grape berry 
moth, grape flea-beetle, etc., 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 work. 
_ In the Bureau’s experiments arsenate of lead has been used at the 
rate of 5 pounds to each 50 gallons of liquid. The poison preferably 
should be used in Bordeaux mixture, the application of which is 
essential for the control of fungous diseases. It is a prevalent belief 
that the addition to the poison spray of molasses or glucose renders 
it attractive to the beetles and insures better results. Observations 
and experiments on this question, while not conclusive, throw doubt 
on the value of the recommendation. 
The first application of spray should be given just before the 
blossoms open, and if the beetles continue destructive the treatment 
should be repeated as soon as the blossoms have fallen. Arsenate of 
lead (paste) should be used at the rate of 4 or 5 pounds to 50 gallons 
of water or Bordeaux mixture, and the spray should be applied very 
thoroughly. Vineyardists should adopt a definite spraying sched- 
ule, which will insure the maximum protection from the various in- 
sects and fungous diseases of the vine. Vineyards regularly sprayed 
should be less injured by the rose-chafer than those not so treated. 
For the destruction of the beetles on fruit trees, as peach, apple, 
etc., arsenate of lead should be used, preferably in a fungicide, 
such as Bordeaux mixture, when the beetles first appear. It should 
be applied at the same strength indicated for vineyards, namely, 
4 or 5 pounds to 50 gallons of spray. In spraying peaches and 
other stone fruits the arsenical should be used in the self-boiled lime- 
sulphur wash? or in water to which has been added lime wash made 
from slaking 3 or 4 pounds of good stone lime. Repeated applica- 
tions may be necessary, depending upon the extent of reinfestation 
of the trees by newly emerged beetles, or those from other sources. 
HAND PICKING. 
The old-fashioned remedy of hand picking is of service when the 
beetles infest rose bushes, grapes, or other low-growing plants. The 
beetles may also be jarred from trees and bushes over sheets saturated 
with kerosene, but these methods are tedious and must be practiced 
daily in the early morning or toward sundown to be effective. <A 
number of useful mechanical appliances formed on the plan of a 
funnel or inverted umbrella, with a bag or can containing kerosene 
at the bottom, have been devised for the collection of the beetles as 
they are jarred from the plants. 
NETTING AND BAGGING. 
Choice plants may be securely protected by a covering of netting, 
and when the process of bagging may profitably be employed, this 
method should be followed. Bagging, as is well known, prevents 
1 See Farmers’ Bulletin 284, U. S. Department of Agriculture. 
2 See Farmers’ Bulletin 440, U. S. Department of Agriculture. 
