234 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
THE GROTON EXPERIMENT. 
Conducted by E. A. Landon, Groton, N. Y., who sprayed 
8# acres of potatoes five times on the following dates: July 7, 
16, 27, Aug. 18 and 25. The sprayer was a two-horse, six-row 
“ Aroostook”? sprayer carrying two nozzles per row. The 
bordeaux used was of the 4-4-50 formula. The water required 
for its preparation was pumped by hand from a stream at 
one side of the field. Bugs were kept under control by using 
paris green with the bordeaux in three sprayings at the rate 
of one-half pound to 50 gallons. The check rows, of which 
there were four, were also treated three times with paris green. 
Early and late blight were both absent, but flea beetles and 
tip burn caused much damage. The spraying checked the flea 
beetles somewhat, but the difference between sprayed and un- 
sprayed rows was not marked at any time. 
The items of expense were as follows: 
300 ‘Ibs. copper sulphate (@) Se. 2; i. di SS Se eee ae $24 .00 
B00 Tbs. Time (@ ‘Leste es bar RG ee eee 3.00 
20 ibs: paris green’ (@ 280028 Sake rene oe eee eee cree eee 7.00 
Sprayer, man and team, hired for 5 days @ $5 per day...... 25.00 
24 days labor for extra man @ $2. 57.5.5 ...4 <a eee ee 5.00 
fhe: A er eer reer sre yg ie $64 .00 
The test rows, which were of the variety State of Maine, 
were 650 ft. long by three feet wide. They yielded as follows: 
Two sprayed rows, 715 lbs.=133.1 bu per acre. 
Two unsprayed rows, 607 lbs.==113 bu. per acre. 
Increase in yield due to spraying, 20.1 bu per acre. 
Lope Ta 
The market price of potatoes being 65 cents per bushel the 
value of the increase is $13.06. If we subtract the expense 
of spraying, $7.31 per acre, there remains a net profit of $5.65 
per acre. 
