TS2 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
70 hours labor for horse, at 10¢...........00ceeeeees $7 00 
Wear on sprayer, at 25c. per acre...... Ef OTS 3 50 
AAG CRE reer, Obert Se etnmerne Siege See. Tay SS $74 47 
Dotal cost. of Spraying PereAeres: ssa ss sis c..8 = samsepeene a eee $5 32 
Cost per acre for each SPrayin Gu.) 25.00 £6-ter ste eyete o4 a © 76 
At the time of digging the test rows the market price of pota- 
toes was $1.75 per barrel or 60 cents per bushel at Wallabout 
Market in Brooklyn, where Mr. Colyer markets most of his pota- 
toes. Later the price rose, being $2 per barrel on November 14. 
At 60 cents per bushel 106 5-6 bushels would be worth $64.10. 
Subtracting $5.32, the expense of spraying, there remains a net 
profit of $58.90 per acre. 
THE FARMINGDALE EXPERIMENT. 
This experiment was made by R. E. Colyer at Farmingdale on 
Long Island. Fifteen acres of potatoes were sprayed four times. 
Three rows 680 feet long, 21%4 feet apart, were left unsprayed 
for a check. The soil was sandy loam. The potatoes were of 
the variety Carman No. 3. 
The dates of spraying were June 27, July 11, 25 and August 
4. The sprayer used was a two-horse, home-made rig covering 
Six rows at a time with two nozzles per row. The spray pump 
was bought of the Spramotor Co., Buffalo, N. Y. In the first 
spraying the pumping was done by hand, but afterward with 
power obtained from the wheels. (Plate XII, fig. 1.) Bordeaux 
mixture was applied at the rate of about 60 gallons per acre in 
each spraying. Water for preparing the bordeaux was obtained 
from a pond about twenty rods distant. 
On July 23 there were traces of late blight on sprayed and 
unsprayed rows. Flea-beetles and plant lice were abundant in > 
all parts of the field. There was no early blight. 
On August 11 the plants on the unsprayed rows were dead, 
but the stems were not yet dry. They had been killed by late 
blight and flea-beetles, chiefly the former. At the same time 
about three-fourths of the leaves on the adjacent sprayed plants 
were still green, the other one-fourth being affected with late 
blight. A fifth spraying at this time would have been very bene- 
