POTATO SPRAYING EXPERIMENTS 
IN 1902.* 

F. C. Stewart, H. J. Eusrace anp F. A. SIRRINE. 
SUMMARY. 
The Station has undertaken to determine how much the yield 
of potatoes may be increased, on the average, by spraying the 
plants with bordeaux mixture for ten consecutive seasons; also, 
which is more profitable, to spray every two weeks throughout 
the growing season, or to make but three applications. The ex- 
periments are to be carried on in two localities; viz., on the 
Station farm at Geneva and on Long Island. At each place the 
area of the experiment field is to be three-tenths of an acre each 
Season. Each year, or as often as advisable, there will be pub- 
lished a bulletin giving the results up to date; also other infor- 
mation on the spraying of potatoes. 
The present bulletin gives the results of the first year’s work. 
At Geneva, the rows sprayed three times yielded at the rate of 
317$ bushels per acre; those sprayed seven times 3424 and 
those not sprayed, 219. Thus, three sprayings increased the 
yield 984 bushels per acre and seven sprayings, 1234 bushels. 
The increased yield on sprayed rows was due, chiefly, to the 
prevention of late blight. 
On Long Island the rows sprayed three times yielded at the 
rate of 2954 bushels per acre: those sprayed seven times, 3124 
and those not sprayed, 267%. ‘The increased yield due to three 
sprayings was 27% bushels per acre, while that due to seven 
sprayings amounted to 45 bushels yer acre. There being no 
damage from blight or “ bugs,” the increased yield on the sprayed 
rows in*the Long Island experiment must have been largely due 
to better protection against flea-beetles. 
*A reprint of Bulletin No. 221. 
