New York AGRICULTURAL EXPERIMENT STATION. 173 
six times with a one-horse, Watson sprayer covering four rows 
at a time with one nozzle per row. The remaining two acres 
were not sprayed. 
We examined this experiment at the time of the fifth spray- 
- ing, August 8. On the unsprayed portion of the field, flea-beetles, 
early blight and late blight were all abundant and it was plain 
that they would soon ruin the plants. At the same time the 
sprayed portion of the field was in fairly good condition although 
infested to a considerable extent by all three enemies above 
mentioned. The plants were so large that they covered the 
ground completely, making it impossible to do a thorough job 
of spraying with but one nozzle per row. | 
One of the writers was present when the test rows were dug 
and assisted with the weighing. A sprayed row 3714 rods long 
yielded 832 pounds of marketable tubers or at the rate of 32514 
bushels per acre; while an unsprayed row 3814 rods long yielded 
52614 pounds or at the rate of 20014 bushels per acre, making 
a difference of 125 bushels per acre in favor of spraying. How- 
ever, it may be that all of this difference was not due to spraying. 
Although the sprayed and unsprayed rows were on the same kind 
of soil and seemed to have an equal chance in all respects save 
the matter of spraying, they can not be closely compared because 
they were about 80 feet apart. 
In another portion of the same field a row sprayed six times 
outyielded a row sprayed three times by 26 bushels 21 pounds 
per acre. 
The market price of potatoes at digging time was 50 cents per 
bushel. 
EXPERIMENT NO. 389. 
Conducted by H. M. Reeve on the farm of G. O. Hallock, 
Mattituck, Long Island. Each time after spraying his own field 
Mr. Reeve went out and back with the sprayer across Mr. 
Hallock’s potato field covering 14 rows. These rows were about 
34 rods long, 26 of them being required to make an acre. They 
were sprayed four times, commencing July 12 and repeating once 
a week. The sprayer used was a or2-horse, Schanck sprayer like 
the one shown in Plate XIII, fig. 1. The total cost of spraying 
was $1.60 per acre. 
