120 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
frost had not come until after the plants had finished their growth 
the gain due to spraying would have been still larger. 
THE DENMARK EXPERIMENT. 
This experiment was made by H. E. Cook at Denmark in 
Lewis County. Two and three-fourths acres of potatoes were 
sprayed four times—July 14, 28, August 15 and 27. 
There were two varieties in the field—Carman No. 3 and Rural 
New Yorker No. 2. In the latter variety three rows were left 
unsprayed. These rows were 586 feet long and 3 1-3 feet apart, 
2214 rows being required to make an acre. The soil was a 
sandy loam with some gravel in it. 
The spraying was done with an “Aroostook” two-horse power 
sprayer covering four*® rows at each passage with one Vermorel 
nozzle over each row. In the first three sprayings paris green 
was used with the bordeaux at the rate of one pound to fifty 
gallons. At the time of the first spraying the unsprayed rows 
were treated with paris green in water. At the time of the 
second spraving the unsprayed rows were accidentally sprayed 
with bordeaux and paris green the same as the sprayed rows. 
On August 15 when the third spraying was made bugs were 
plentiful and poison should have been applied to the unsprayed 
rows, but it was neglected, with the result that bugs injured the 
unsprayed rows considerably. . 
When the experiment was examined on September 13 there 
was a little blight on both sprayed and unsprayed rows, but no 
material damage had been done. The plants were killed by frost 
on September 21. 
The test rows were dug by hand on October 7. . The*yields 
were as follows: 
Second sprayed row on the north, 561 pounds marketable 
tubers. 
Second sprayed row on the south, 580 pounds marketable 
tubers. 
*'The sprayer was intended to spray six rows at a time, but owing to the 
unusual width of the rows (34 feet) it was necessary to rearrange the noz- 
zles, and in doing this the change to four rows was made for the sake of 
convenience. ‘ In the third spraying extra nozzles were added so that every 
other row received spray from two nozzles. Mr. Cook states that on the 
double-sprayed rows the spraying was much more thoroughly done. He is 
Ms the opinion that two nozzles per row are needed when the vines become 
arge. ; 
