158 Report oF THE BoTANICAL DEPARTMENT OF THE 
Paris green was used with the bordeaux not uniformly over the 
whole field, but whenever and wherever needed in the first, third, 
fifth and sixth sprayings and in the extra spraying of July 22. In 
all, 112 pounds of paris green were used. Perhaps the quantity 
was unnecessarily large. On the unsprayed rows, one application 
of paris green made June 26 was sufficient to prevent injury by 
bugs. 
An examination of the experiment was made July 11. At that 
time there was no appreciable difference between the sprayed and 
unsprayed rows. On the unsprayed rows in the north test it was 
easy to find leaves affected with late blight and occasionally speci- 
mens of the disease were found also on the sprayed rows. Mr. 
Satterly states that he first found late blight July 5. Fortunately, 
the weather conditions during the greater part of July were un- 
favorable to blight so that an epidemic of the disease was avoided, 
but it made steady progress and in August did considerable dam- 
age. About July 22 swarms of flea beetles appeared and became 
an important factor in the experiment. There was also some early 
blight. 
The test rows were dug on October Io with a potato digger. 
North test—In the portion of the field in which this test was 
located the previous crop was hay. The test rows were 360 feet 
long. The yields were as follows: 
Second sprayed row on the north, 469% lbs. marketable tubers. 
Second sprayed row on the south, 412 lbs. marketable tubers. 
Average of two sprayed rows, 44034 lbs. marketable tubers. 
Middle unsprayed row, 329 lbs. marketable tubers. 
Yield, sprayed, 296 bu. 15 lbs. marketable tubers per acre. 
Vield, unsprayed, 221 bu. 9 lbs. marketable tubers per acre. 
Gain, 75 bu. 6 lbs. marketable tubers per acre. 
The yield of culls (small sound tubers) was at the rate of 16 
bu. 48 lbs. per acre for the sprayed and 22 bu. 11 lbs. for the 
unsprayed. On the unsprayed row there was some rot, but on the 
sprayed rows none. 
South test.—This test was located in a portion of the field which 
grew potatoes in 1904. The rows were 348 feet long. The yields 
were as follows: 
Second sprayed row on the north, 281 Ibs. marketable tubers. 
Third sprayed row on the south,” 296% Ibs. marketable tubers. 
™The second sprayed row on the south fell in a dead furrow. 
