160 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
‘EXPERIMENT NO. 22. 
H. Van Voorhis, Hopewell, Ontario County, sprayed fifteen 
acres of potatoes five times, leaving unsprayed three rows of Sir 
Walter Raleigh 45 rods long. 
The sprayer used was a two-horse, home-made outfit covering 
six rows at a time with one Vermorel nozzle per row. The pump- 
ing was done by power obtained from the wheels. 
The yield of the middle unsprayed row was 7 bushels, or at the 
rate of 136 bushels 51 pounds per acre. The first sprayed row, 
only six feet away, yielded 1014 bushels, or at the rate of 205 
bushels 16 pounds per acre. This makes the gain from spraying 
68 bushels 25 pounds per acre. 
We examined this experiment on August 23 and again on 
September 9. At the time of our first visit it was easy to pick 
out the unsprayed rows at a short distance. They had already 
lost a good many of their lower leaves from late blight while the 
sprayed rows showed only a little blight. Also the sprayed 
rows were noticeably of a darker green color. On September 9 
the unsprayed rows were nearly dead while the sprayed rows 
adjacent, although showing considerable brown foliage, were 
still in fair condition. Probably two-thirds of their foliage was 
ereen. 
The fifth spraying was made September 5 and 6 about three 
weeks after the fourth spraying. Much better results would have 
been obtained if an extra spraying had been made about August 
26. Mr. Van Vooris is convinced of the necessity of thorough 
spraying. 
- Bugs did no damage to the unsprayed rows and there was no 
rot worth mentioning on either sprayed or unsprayed. Price of 
potatoes, 40 cents. 
EXPERIMENT NO. 23. 
This experiment was made by Ed. Welch, Phelps, Ontario 
County. He sprayed five acres of potatoes, Carman No. 3, twice, 
the last application being a double one. Two rows 1006 feet long | 
were left unsprayed. ) 
The spraying was done with a two-horse, five-row Aroostook 
power sprayer, the same one used by Mr. Welch in his experi- 
ment in 1903. (See Bulletin 241, page 276.) The total expense 
of spraying was $7.30. 
