26 ReEevorr oF THE BoraANICAL DEPARTMENT OF THE 
The items of expense for spraying eight acres seven times in 
the Malone experiment were as follows: 
310: pounds copper sulphate’ at 5340 wees ee $17 82 
24 pounds paris green at 15¢.......... BOS Gators hen 3 60 
200 pounds lime at one-half cents. <ttiw. va ee ee ee ee 1 25 
(0 hours, labor, for: man: at FLO Wad .ga ete s eta 
70;hours labor-for horse at 5G. ich Was ete came 3 50 
Allowance for wear ofqsprayer. ..i5<2- sok oa -eeee vee Lae 
DOTA Bee Nitin 0 bie hance Gree Fuente ae nae oe $46 69 
Total cost per acre for seven sprayings....... Mette 5 $5) 83 
Cost per acre for each spraying..... itl pesos ears 834 
At 40 cents per bushel 11434 bushels of potatoes would be worth 
$45.90. Subtracting $5.83, the cost of spraying, there remains 
a net profit of $40.07 per acre. 
e 
THE PERU EXPERIMENT. 
This experiment was conducted by Datus Clark at ~Peru in 
Clinton County. Sixteen acres were sprayed four times. There 
were two varieties; namely, Green Mountain and White Giant. 
Six rows about 80 rods long and running cross-wise of both vari- 
ties were left unsprayed. The soil was sandy loam. The nearest 
point of the field was sixty rods from the water supply. The 
Spraying was done with a six-row, two-horse “ Aroostook ” power 
sprayer made by the Field Force Pump Co., Elmira, N. Y. The 
sprayer was fitted with one Vermorel nozzle for each row. The 
dates of spraying were July 18, 29, August 9 and 22. Paris 
green was used with the bordeaux twice. Perhaps this was un- 
necessary. Although no poison whatever was applied to the 
unsprayed rews they were not injured by bugs. 
At no time during the season was there any blight OF: impor- 
tance even on the unsprayed rows. However, there must have 
been a little late blight, Phytophthora infestans, because a few 
rotten tubers were found. On September 9, when the experi- 
ment was examined by one of the writers, it was impossible to dis- 
tinguish the unsprayed rows. No trace of late blight could be 
found at this time. The plants were large and healthy except 
for a slight spotting of the foliage the cause of which was not 
definitely determined. Other potato fields in the vicinity were 
looking well with almost no indication of blight. 
