CONTROL OF THE GRAPE-BERRY MOTH. 39 
mally necessary. These figures do not include interest on money 
invested in the spraying machine, depreciation, breakage, or inci- 
dental costs of operation, such as gasoline and oil, since these vary 
greatly. The details of cost for a single application are as follows: 
Materials for 150 gallons of spray mixture: 
Arsenate of lead (paste), 9 pounds, 8 cents per pound $0. 72 
Lime, 3 pounds, ^ cent per pound 01 
Kesin fish-oil soap, 3 pounds, 6| cents per pound 19 
Labor, 3 men, £ day at $2 per day 1. 00 
1 team, % day, at $3 per day 50 
2. 42 
For the two applications the cost would be $4.84 per acre. 
The entire cost, however, need not be charged to berry-moth con- 
trol if a combination spray is used. These two spray applications 
are necessary in the majority of vineyards to secure the greatest 
possible profits, even if the berry moth is not present. In a vineyard 
where control measures are already employed against the rootworm, 
leafhopper, and powdery mildew, the additional cost per acre in 
controlling the berry moth would be as follows: 
Extra cost of labor for using "trailers" instead of "set nozzles" in the first 
application. 
Labor cost with ' ' trailers " (see above) $1. 50 
Labor cost with "set nozzles," 1 man and team -J day at $5 per 
day : 675 
$0. 825 
Arsenate of lead (paste), 9 pounds for second application, at 8 cents per 
pound 72 
Soap, 6 pounds (2 applications), at 6 1 cents per pounds 375 
Total 1. 920 
Thus, if spraying for rootworm, leafhopper, and mildew is properly 
done the extra cost of spraying for the grape-berry moth is only 
$1.92 per acre. 
SUMMARY AND RECOMMENDATIONS. 
The grape-berry moth can be controlled by spraying. Other 
methods will reduce berry-moth infestation, and some of them can 
be employed profitably to increase the efficiency of spraying, but 
none offers a dependable control in commercial vineyards. 
Gathering and destroying grape leaves in the fall is of little use in 
berry-moth control. 
Bagging grape clusters immediately after the setting of the fruit 
will exclude the berry moth and prevent infestation, but the expense 
is prohibitive in commercial vineyards in this region and may be 
used advantageously only in garden vineyards. Hand picking of 
grape berries infested by first-brood larvae, if done by competent labor, 
will reduce berry-moth infestation, but except in extraordinary cases 
