New York AGRICULTURAL EXPERIMENT STATION. 149 
Average of two sprayed rows, 1,461 lbs. marketable tubers. 
Middle unsprayed row, 966 lbs. marketable tubers. 
Yield, sprayed, 235 bu. 59 lbs. marketable tubers per acre. 
Yield, unsprayed, 156 bu. marketable tubers per acre. 
Gain, 79 bu. 59 lbs. marketable tubers per acre. 
Rotten tubers were much more frequent on the unsprayed row 
than on the sprayed rows, but the loss was not great in either case. 
The yield of small and rotten tubers was 21 bu. 26 lbs. per acre 
for the sprayed and 46 bu. 31 lbs. per acre for the unsprayed. 
Most of the difference was in rotten tubers. 
The six-acre field——This field, also, was of the variety Enormous 
No. 9g. The plants were sprayed five times — July 27, August 17-18, 
26, September 2 and g. In all, 1,650 gallons of bordeaux were used 
on this field. Paris green was applied only once; viz., in the first 
spraying when eight pounds were used. There were three un- 
sprayed rows 688 feet long and these received an application of 
paris green in water on the same date. being so late planted 
(June 8) the potatoes in this field had not nearly finished their 
growth when frost came September 13. The unsprayed rows were 
already commencing to die, but the sprayed rows were in full 
foliage. Had not frost come so early the yields in this field would 
have been larger and also the gain due to spraying larger. The 
test rows were dug with a potato digger on October 10, the yields 
being as follows: 
Second sprayed row on the east, 332 lbs. marketable tubers. 
Second sprayed row on the west, 381 lbs. marketable tubers. 
Average of two sprayed rows, 356% lbs. marketable tubers. 
Middle unsprayed row, 251 lbs. marketable tubers. 
Yield, sprayed, 118 bu. 50 lbs. marketable tubers per acre. 
Yieid, unsprayed, 83 bu. 4o lbs. marketable tubers per acre. 
Gain, 35 bu. to lbs. marketable tubers per acre. 
There was no rot of any account except at the north end where 
hog manure had been spread. Here, there was some rot but de- 
cidedly more on the unsprayed row than on the sprayed. The yield 
of small and rotten tubers was 9 bu. to lbs. per acre for the sprayed 
and 23 bu. per acre for the unsprayed. 
Combining the results obtained in the three fields we have an 
average gain of 60 bu. 14 lbs. of marketable tubers per acre. On 
the average, spraying increased the yield 40 per ct. The gain is 
