160 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
In this experiment the total expense of spraying was $0.84 per 
acre or 85! cents per acre for each application. 
On July 11 when one of the writers visited the experiment field 
the unsprayed rows were apparently in as good condition as the 
sprayed rows. However, close examination revealed traces of late 
blight on the unsprayed rows. A month later (August 12) the 
unsprayed rows were nearly dead with late blight and the sprayed 
rows also were much affected and going down rapidly. Flea 
beetles which appeared in large numbers about July 22 added their 
injury to that done by blight. In the north test the sprayed rows 
outlived the unsprayed ones about two weeks, but in the south 
test the difference was less. Bugs were kept well under control 
on the unsprayed rows as well as on the sprayed ones. ‘The test 
rows were dug on August 26 with a potato digger and the follow- 
ing results obtained: 
North test—Eighteen rows required to make an acre. The yields 
were as follows: 
a 
Two sprayed rows,” 2,044 Ibs. marketable tubers. 
Middle two unsprayed rows, 2,007 lbs. marketable tubers. 
Yield, sprayed, 306 bu. 36 lbs. marketable tubers per acre. 
Yield, unsprayed, 3 1 bu. 3 lbs. marketable tubers per acre. 
Gain, 24 bu. marketable tubers per acre. 
The yield of culls (small sound tubers) was 16% bu. per acre 
for the sprayed and 25% bu. for the unsprayed. There was scme- 
what more rot on the unsprayed rows than on the sprayed, but not 
much in either case. 
South test——Here, also, eighteen rows were required to make an 
acre. The yields were as follows: 
Two sprayed rows,” 2,167 lbs. marketable tubers. 
Middle two unsprayed rows, 2,007 lbs. marketable tubers. 
Yield, sprayed, 325 bu. 3 lbs. marketable tubers per acre. 
Yield, unsprayed, 301 lbs. marketable tubers per acre. 
Gain, 24 bu. marketable tubers per acre. 
The yield of culls was 28 bu. 39 lbs. per acre for the sprayed 
and 23 bu. 51 lbs. per acre for the unsprayed. The conditions as 
regards rot were the same as in the north test. | 
* The second sprayed row on either side of the check. 
“The second and third sprayed rows on the south side of the check. 
