New YorRK AGRICULTURAL EXPERIMENT STATION. 119 
Another row sprayed only once yielded at the rate of 158 bu. 
37 lbs. per acre, which is 35 bu. 57 Ibs. more than the yield of the 
unsprayed row. 
anere was a severe attack of blight in this experiment, but no rot. 
Experiment No. 5.— The yields given in Table XVI are the aver- 
age of two tests. In one test, on the variety Green Mountain, the 
gain due to spraying was 85 bu. 15 lbs. per acre, while in the other 
test, which was on the variety Sir Walter Raleigh, it was 122 bu. 
27 lbs. per acre. The average gain in the two tests was 103 bu. 51 
Ibs. per acre. 
In both tests the unsprayed rows showed some blight August 15 
and ten days later were all black; while the sprayed rows remained 
green until they were killed by frost on September 15. “ Bugs” 
were in no way responsible for the large gain in the Sir Walter 
Raleigh test. Mr. Bernholz reports that “ bugs ”’ caused more dam- 
age to the sprayed rows than to the unsprayed ones. 
Experiment No. 6.— This experiment was made by W. L. Mc- 
Dermott, Riverhead, Long Island. Two applications of poison were 
made before spraying with bordeaux was begun. The dates of 
spraying were July 13, 20, 28, August 8, 14 and 24. The test rows 
were in the variety Gold Coin. They were dug and weighed No- 
vember 5 in the presence of a Station representative. The yields 
were as follows: 
Two sprayed rows, 1,110 lbs. — 2 4r bu. 31 lbs. per acre. 
Two unsprayed rows, 644.5 lbs. = 140 bu. 14 lbs. per acre. 
Gain, ror bu. 17 lbs. marketable tubers per acre. 
Experiment No. 7 The check consisted of two unsprayed rows 
faba the center of the field. The dates of spraying were July 
31, August 3 and 16. 
Experiment No. 8— There were three unsprayed rows, 419 feet 
long. These yielded 18 bushels, while three rows on both sides of 
the unsprayed strip yielded 28 bushels. On the unsprayed rows 
there were three bushels of rotten potatoes, but the sprayed portion 
of the field was free from rot and the potatoes kept well in storage. 
The cost of spraying materials was 40 cents per acre for each 
spraying. 
Experiment No. 9.— The items of expense for materials to spray 
5 acres 7 times and 8 acres 6 times were as follows: 
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