New YorkK AGRICULTURAL EXPERIMENT STATION. 167 
of rotten tubers was estimated at 1214 bushels per acre and there 
seemed to be nearly if not quite as many on the sprayed as on 
the unsprayed. 
Mr. Belden has sprayed potatoes for a number of years past. 
Sometimes he was positive it paid, but in other seasons he was 
in doubt. 
The market price of potatoes at digging time was 40) cents per 
bushel. 
EXPERIMENT NO. 31. 
Conducted by G. G. Hitchings, South Onondaga, Onondaga 
County. Hight acres of potatoes were sprayed three times (July 
6, 24 and August 15) with a Niagara Gas sprayer set on a two- 
horse cart rigged to spray two rows at a time with three Ver- 
morel nozzles per row. The spray mixture used was made by 
the following formula: 5 pounds copper sulphate, about four 
pounds lime, 21% pounds arsenate of lead (for bugs) and 50 gal- 
Ions of water. 
In one lot containing 134 acres, six rows of the variety Mam- 
moth Whiton were sprayed only once (July 6), while the re- 
mainder were sprayed three times. Unfortunately, no rows were 
left entirely unsprayed. The six rows sprayed but once yielded 
12 bushels of marketable potatoes and 2 bushels of rotten ones, 
while six three-sprayed rows of the same variety yielded 21 
bushels of marketable potatoes with only seven rotten tubers. 
These yields are at the rate of 125 bushels 38 pounds per acre for 
the once-sprayed rows and 219 bushels 52 pounds per acre for the 
three-sprayed rows, making a difference of 94 bushels 14 pounds 
per acre for the two extra sprayings. The potatoes on the heavily- 
sprayed rows were also of better quality. Most of the crop was 
sold at prices ranging from 50 to 60 cents per bushel. 
The three-sprayed rows outlived the once-sprayed rows by 20 
days although the latter were not injured by bugs. The princi- 
pal enemies fought in this experiment were late blight and flea- 
bettles. 
In the 134-acre lot above mentioned, only one-fourth of the 
area was planted with Mammoth Whiton and the remainder 
with Rural New Yorker No. 2. The latter variety yielded much 
the better, bringing the average yield for the 134 acres up to 253 
bushels per acre. 
