New York AGRICULTURAL EXPERIMENT STATION. 123 
completely killed by blight about the middle of August. The 
sprayed rows became affected about as soon, but on these the 
disease made much slower progress so that the plants continued 
green until the second week in September. 
Experiment No. 21.— The seven sprayings were made at intervals 
of one week. About 36 gallons of bordeaux per acre were used 
in each spraying. Mr. Chamberlain reports that the sprayed 
rows were quite green after the unsprayed rows were entirely 
dead from blight. 
Experiment No. 22.— The yields given in Table XVI are the 
average of three tests in three different fields as follows: 
Test No. 1.— Six sprayed rows, 1,330 Ibs. — 208 bu.-35 lbs. per acre. 
Six unsprayed rows, 930 lbs. — 145 bu. 51 lbs. per acre. 
Gain, 62 bu. 44 lbs. marketable tubers per acre. 
Test No. 2— One sprayed row, 1,232 lbs. — 246 bu. 24 lbs. per acre. 
_ One unsprayed row, 983 lbs. = 1096 bu. 36 lbs. per acre. 
Gain, 49 bu. 48 lbs. marketable tubers per acre. 
Test No. 3— Two sprayed rows, 505 Ibs.—=231 bu. 27 lbs. per acre. 
Two unsprayed rows, 367 lbs.— 168 bu. 12 lbs. per acre. 
Gain, 63 bu. 15 lbs. marketable tubers per acre. 
Mr. Hudson estimates that his total gain from spraying was 
1,500 bushels. In view of the results of the three tests we con- 
sider his estimate a conservative one. Judging from an exam- 
ination of this experiment made July 20 we are of the opinion 
that the increased yield on the sprayed rows was due to pro- 
tection against the ravages of late blight and flea beetles, chiefly 
the former. Mr. Hudson states that the sprayed rows outlived 
the unsprayed rows as follows: In Test No. 1, three weeks; 
in Test No. 2, two weeks; and in Test No. 3, 19,days. There 
was no rot in any of the tests. 
Experiment No. 23.—In this experiment there were three un- 
sprayed rows and the increase in yield was determined by com- 
paring the middle unsprayed row with the second sprayed row 
on each side. 
The dates of spraying were July 16, 25, August 6 and 17. In 
the first two sprayings bordeaux of the 6-6-50 formula was used, 
but in the last two sprayings the strength was increased to 
8-8-50.. Mr. Darling reports that the unsprayed rows began to 
show blight the second week in August and by August 25 were 
completely dead. The unsprayed rows were kept thoroughly 
free from “ bugs.” 
