New YorK AGRICULTURAL EXPERIMENT STATION. 121 
Average of the two sprayed rows, 57014 marketable tubers. 
Middle unsprayed row, 512 pounds marketable tubers. 
Yield, sprayed, 211 bu. 33 lbs. marketable tubers per acre. ~ 
Yield, unsprayed, 189 bu. 52 lbs. marketable tubers per acre. 
Gain, 21 bu. 41 lbs. marketable tubers per acre. 
The yields of culls, including both small and rotten tubers, was 
at the rate of 22 bushels 4 pounds per acre on the sprayed rows 
and 21 bushels 8 pounds on the unsprayed. Fully one-half the 
culls consisted of rotten tubers in the early stages of decay and 
apparently there was just as much rot on the sprayed as on the 
unsprayed rows. All of the rot seemed to be of the kind which 
follows late blight, Phytophthora infestans. This is proof that 
there was some late blight in the field, on the sprayed as well as 
on the unsprayed rows. A fifth spraying, made about September 
10, would probably have prevented most of the rot. 
The items of expense of spraying two and three-fourths acres 
were as follows: 
fepounds copper sulphate, at TC. 2.2... vec cece neces $7 00 
PpOUmdsa Ne MAL SCOR se, 6. AY. Ook BE 50 
8 pounds paris green, at 15c........ Mea te ear ne 1 20 
Serie ve MAbOr fon man, at, SLibO: 6 occ. sais, . 3s cea es 5 Ov 
ee Sal DON) DOT TOA AU. sp LOO 6 sere e ectye- myers, Sie we ony 0s 2 50 
Bee IO MDC AVC Tam Scan at ees Bi Seo te Best des oma gis Siena g <8 3 00 
REI rae hc Faha len chen Gn fae Wear e's Ciseoth « woe aeler $19 20 
BeeCOsl 4h SPLaviIne Del ACTC ne. es cine eee tee $6 98 
Beta er acre LOT EACH Spraying... cs. ee cies wept enews» 1 7414 
-In this experiment the cost per acre for each application is 
high, being more than twice as great as in other experiments 
made with the same kind of sprayer.*® This is largely owing to 
the long distance (one mile) which it was necessary to haul water 
for making the bordeaux. 
Soon after digging, the potatoes were sold for fifty cents per 
bushel. At this price 21% bushels would be worth $10.83. Sub- 
tracting $6.98, the cost of spraying per acre, there remains a net 
profit of $3.85 per acre. 
76See pp. 107, 126, 158, 161 and 162; also Bul. 241, pp. 273, 275 and 278. 
