New York AGRICULTURAL EXPERIMENT STATION. 157 
On September 22 the plants on the unsprayed acre were all 
dead except for small tufts of green leaves on a few plants at the 
north end of the field. The sprayed plants still retained a large 
part of their foliage, but they were showing old age** and were 
somewhat injured by early blight. This latter fact is noteworthy 
because the spraying in this experiment was of the most thorough 
“kind and should have controlled early blight absolutely were it 
possible to do so. Plate XIV, fig. 2, shows the condition of the 
field on September 22. The plants were killed by frost on the 
. following night. 
_ Notwithstanding the large number of sprayings in this experi- 
ment, the actual expense was not large, being only $7.66 per acre. 
At 4214 cents per bushel for potatoes pee was a net profit of 
$18.69 per acre on the operation. 
Mr. Martin has practiced spraying potatoes for several years 
past and is convinced that it is profitable. 
EXPERIMENT No. 18. 
Conducted by John Dell, East Rush. Twelve acres of potatoes, 
variety Rural New Yorker No. 2, were sprayed four times, with 
six rows 870 feet long, 34 inches apart, left unsprayed for a 
check. 
The spraying was done by a hired operator and machine, at 45 
cents per acre for each application, or $1.80 per acre for the four 
applications. This includes both labor and chemicals. The 
sprayer used was a one-horse automatic Hudson sprayer, which 
sprays six rows at each passage with one nozzle per row. 
The middle four unsprayed rows yielded 31 bushels, or at the 
rate of 136 bushels 38 pounds per acre; while four sprayed rows 
separated from them only by one sprayed and one unsprayed row, 
yielded 39 bushels, or at the rate of 172 bushels 17 pounds per 
acre. Thus the gain due to spraying was 35% bushels per acre. 
Neither sprayed nor unsprayed rows were injured by bugs. 
In each 100 bushels there were about three bushels of rotten 
tubers. The unsprayed rows died about three weeks earlier than 
the sprayed, making a very striking contrast. Price of potatoes 
in Rochester at digging time, 65 cents per bushel. 
“The potatoes were planted May 18. 
