New York AGrRicuLtTuRAL EXPERIMENT STATION. 129 
On August 12 there seemed to be no difference whatsoever 
between the sprayed and unsprayed rows. The plants were 
healthy but not large. There was neither early nor late blight 
and no damage from flea-beetles. During the preceding three 
weeks there had been but little rain and the weather conditions 
were unfavorable to blight. Up to the time the plants were 
killed by frost there was very little contrast in appearance be- 
tween the sprayed and unsprayed rows. Nevertheless, when the 
test rows were dug on September 30, the sprayed rows were 
found to outyield the unsprayed sufficiently to cover all expense 
of spraying and leave a small net profit. The yields were as 
follows: 
Second sprayed row on the west, 314 Ibs. marketable tubers. 
Second sprayed row on the east, 311 lbs. marketable tubers. 
Average of the two sprayed rows, 31214 lbs. marketable tubers. 
Middle unsprayed row, 262 Ibs. marketable tubers. 
Yield per acre, sprayed, 151 bu. 15 lbs. of marketable tubers. 
Yield per acre, unsprayed, 126 bu. 48 lbs. of marketable tubers. 
Gain per acre, 24 bu. 27 lbs. of marketable tubers. 
The yield of culls was 30 bushels 29 pounds per acre for the 
sprayed and 32 bushels 55 pounds for the unsprayed. 
There was no rot. The total yield of the three acres was 200 
barrels of 600 bushels, which is at the rate of 200 bushels per 
acre. | 
The items of expense”? of spraying three acres three times are 
as follows: 
446 gallons bordeaux mixture. . ..............6.-6- $4 14 
Gemiirs | AbOr. At® Ie CONUS aie d Poe ee ee eck ee ek eee 9 45 
4 pounds arsenate of lead?® at 25 cents ............ 1 00 
MNO IHL a aT St VCO [Sy sirche) bps xl et oebiei bele ee SG eee 16 
ESERIES aS Ra aR ea PE os POA ONS EN Cee $14 75 
MeeeRIeCOSt Ol SPPAyING, POL ACTC. oo. oe fawn ee ened be mes $4 92 
edetoper acre JOr-Cachy Spraying... . sce ww ad en ces 1 64 
7The actual expense was less than here given because in the third spraying 
only one-half the field was sprayed. These figures show what the expense 
would have been for three full sprayings. 
*In our opinion it is not advisable to use arsenate of lead for poison on 
potatoes. It is too expensive. Paris green and arsenite of soda are both 
considerably cheaper, equally effective and do not injure the foliage if applied 
with bordeaux mixture as they should be applied. 
9 
