250 REPORT OF THE DEPARTMENT OF BOTANY OF THE 
THE ANDOVER EXPERIMENT. 
Conducted by M. A. Crandall & Son, Andover, N. Y. Five acres 
of potatoes (in two lots) were sprayed five times with a one-horse, 
four-row “ Watson” sprayer carrying one nozzle per row. The 
bordeaux used was of the 6—-5-5o in the fifth. Water was obtained 
from a spring 40 rods distant from one lot and 80 rods from the 
other. In three sprayings one pound of paris green and two quarts 
of arsenite of soda stock solution were added to each 50 gallons of 
bordeaux to control bugs, which were very troublesome. ‘Three 
rows 610 feet long by 32 inches wide were left for a check. ‘These, 
also, were treated three times with paris green and, besides, the bugs 
were hand picked once. Early blight, late blight, tip burn, flea 
beetles and bugs were all factors in this experiment. Although 
sprayed and unsprayed rows seemed to have an equal chance so far 
as treatment for bugs is concerned the unsprayed rows were slightly 
more injured by bugs. The iinsprayed rows died 10 to 14 days 
earlier than the sprayed ones. 
The expense account contained the following items: 
98.ibs: copper. sulphate @)/ Se. Sen. Sa ee eee $7 84 
95 -bs... linte, +20 <p saumeivel.. ko ata tine es Sel eieee eek ees eee eee eee I 90 
22 ibs. sal .soda. sa) bc. Oat. te ascdkobes ere nies ee ee Lee I 10 
A-Ibs, ‘paris greetr-(@) 350.7. sy ee +s spa tgee es en ee ie oe I 40 
514 ‘ibs. “white ‘arsemic*@l BOC... aces wet on eee eee Ue eee I 10 
areal i ae “i horse \ soe per acre each application’...... IO 00 
ar Ut Bprayerecee ds css i 
Ota. sss BeOS acerete Bieter sy Dn le eee cn ae Oe $23 34 
The test rows gave the following yields: 
Average of two sprayed rows, 285 lbs.=127.1 bu. per acre. 
Middle unsprayed row, 198 lbs.==88.3 bu. per acre. 
Gain due to spraying, 38.8 bu. per acre. 
There was no loss from rot. 
At 50 cents per bushel 38.8 bushels have a value of $19.40. After 
deducting the expense of spraying, $4.67 per acre, there remains 
a net profit of $14.73 per acre. 
*Mr Crandall did some spraying for neighbors at this price. 
