New York AGRICULTURAL EXPERIMENT STATION. 109 
At this date four sprayings had been made, the last one on- 
August 23 and 24. We advised a fifth application at once but 
the owners thought it would not pay and did not do it. Subse- 
quently, Mr. Brainerd expressed the opinion that a fifth spraying 
would have been highly profitable. 
On the night of September 21 the plants were killed by frost. 
Brainerd & Beaumont report that the five unsprayed rows were 
entirely dried up next the road although in much better condi- 
tion farther south. The sprayed rows on one side had lost about 
three-fourths of their foliage and those on the other side about 
one-fourth. At a little distance all of the sprayed rows looked 
quite green. No doubt the yield would have been considerably 
greater had not the plants been killed by frost.t° At the end 
next the road the sprayed plants lived about 18 days longer than 
the unsprayed. 
The test rows were dug with a potato digger on October 13, 
‘The yields were as follows: 
Second sprayed row on the west, 856 pounds marketable tubers. 
Second sprayed row on the east, 808 pounds marketable tubers. 
Average of two sprayed rows, 832 pounds marketable tubers. 
Middle unsprayed row, 540 pounds marketable tubers. 
Number of rows required to make an acre, 15.35. 
Yield, sprayed, 212 bu. 51 lbs. marketable tubers per acre. 
Yield, unsprayed, 138 bu. 9 lbs. marketable tubers per acre. 
Gain, 74 bu. 42 Ibs. marketable tubers per acre. 
The yield of unmarketable tubers or culls was as follows: 
Second sprayed row on the west, 97 pounds. 
Second sprayed row on the east, 110 pounds. 
Average of two sprayed rows, 10314 pounds or 2614 bushels per 
acre. ) 
Middle unsprayed row, 84 pounds or 211% bushels per acre. 
It appears that there were 5 bushels per acre more culls on the 
sprayed rows than on the unsprayed. This is unusual and would 
18 Brainerd & Beaumont had another field of nine acres of potatoes which 
were planted May 16 to 18 and sprayed five times. The plants in this field 
were still partially green when frost came. They seemed to die naturally 
with very little blight, although the soil and other conditions were as favor- 
able to blight as in the field in which the experiment was made. With earlier 
planting and more spraying it is likely that the gain from spraying in the 
«Gainesville experiment would have reached 100 bushels per acre. 
