86 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
The total expense of spraying was $5.52 per aere or 92 cents 
per acre for each application. 
The test rows were dug October 18 with a potato digger. 
They were 694 feet long by 34 inches wide, 22.15 rows being 
required to make an acre. Practically all of the tubers were 
of marketable size and many were larger than is desirable. 
There were so few small potatoes that sorting was unnecessary. 
The yields were as follows: 
Third sprayed row on the east, 524 Ibs. marketable tubers. 
Third sprayed row on the west, 545 lbs. marketable tubers. 
Average of two sprayed rows, 534% lbs. marketable tubers. 
Middle unsprayed row, 48144 lbs. marketable tubers. 
Yield, sprayed, 197 bu. 19 lbs. marketable tubers per acre. 
Yield, unsprayed, 177 bu. 45 lbs. marketable tubers per acre. 
Gain, 19 bu: 34 lbs. marketable tubers per acre. 
The market price of potatoes being 45 cents per bushel, 19 bu. 
34 lbs. of potatoes would be worth $8.80. Subtracting $5.52, the 
expense of spraying, there is left a net profit of $3.28 per acre. 
THE AVOCA EXPERIMENT. 
This experiment was conducted by G. A. Fox, Avoca, Steuben 
County. Thirteen acres of potatoes were sprayed five times with 
a two-horse, four-row “ Watson” potato sprayer carrying one 
nozzle per row. ‘There were four different varieties of potatoes. 
They were planted about May 25 in hills 34 inches apart each 
way. The soil was sandy loam. ‘The field was nearly level and 
so situated in a valley that a part of it was subject to overflow 
in times of high water. 
The bordeaux mixture was made by the following formula: 
Six pounds of copper sulphate, seven pounds of prepared lime 
and fifty gallons of water, the latter being obtained from a 
pump at one side of the field. In the first three sprayings 
arsenite of soda solution was used with the bordeaux at the 
rate of three pints to fifty gallons of bordeaux, but as this did 
not control the “ bugs” satisfactorily one additional application 
of paris green in water was made. The quantity of bordeaux 
mixture applied was a little less than fifty gallons per acre at 
each spraying. One man and team, with a boy to help in the 
preparation of the bordeaux, sprayed the entire thirteen acres 
in ten hours. The dates of spraying were July 3-5, 12, 24, Au- 
gust I and 15. 
