158 Report OF THE BOTANICAL DEPARTMENT OF THE 
EXPERIMENT No. 19. 
Conducted by George ©. Schoen, Pittsford. Fifteen acres of 
potatoes, variety Peerless Junior, were sprayed four times with 
an automatic, one-horse sprayer called the “New Model Aroos- 
took Six-Row Sprayer.” It carries one nozzle per row. Three 
rows 70 rods long, 35 inches apart, were left unsprayed. The 
total expense for spraying materials was $1.80 per acre. 
The unsprayed rows blighted much more than those sprayed, 
making .the contrast in appearance of the foliage very marked. 
No damage was done by bugs. 
The yield of the middle unsprayed row was 11 bushels, or at | 
the rate of 142 bushels 13 pounds per acre, while the first sprayed 
row, only six feet away, yielded 18 bushels, or at the rate of 232 
bushels 44 pounds per acre. Therefore, the gain due to spraying 
was 9014 bushels per acre. The total yield of the fifteen acres 
was 3,510 bushels, or an average of 234 bushels per acre. 
The market price of potatoes at digging time was 40 cents per 
bushel. 
EXPERIMENT NO. 20. 
Conducted by Roy W. Battams, Fishers, Ontario County. 
Twenty-four acres of potatoes were sprayed, a part’ twice and 
the remainder three times. Four rows were left unsprayed. The 
sprayer used was homemade, four-row outfit, hauled by two 
horses and operated by two men—one to pump, the other to drive. 
The spray pump was a Gould’s Pomona. There was one Ver- 
morel nozzle for each row. The cost of spraying was about $1.03 
per acre each time, the items being as follows: Copper sulphate, . 
40 cents; prepared lime, 9 cents; paris green, 24 cents; and labor 
30 cents. “" 
An unsprayed row 30 rods long, 34 inches wide, yielded 714 
bushels, or at the rate of 233 bushels per acre; a twice-sprayed 
row, four rows away, yielded 814 bushels, or at the rate of 2564 
bushels per acre; and a three-sprayed row, eight rows away, 
yielded 914 bushels, or at the rate of 295 bushels per acre. That 
is to say, two sprayings increased the yield 234 bushels per acre, 
while three sprayings increased it 62 bushels per acre. The test 
rows were of the variety Pride of Britain. The third spraying, 
made August 3, seems to have been much more effective than the 
