New York AGRICULTURAL EXPERIMENT STATION. 187 
It is desirable, but not necessary, that an account be kept of 
all expense of the spraying, including all labor, chemicals, poison 
for bugs and an aliowance for wear of sprayer. 
The sprayed and unsprayed rows to be measured should not be 
far apart. Probably the fairest test that can be made on a small 
scale is to have three unsprayed rows, then measure the crop on 
the middle one and also on the second sprayed row on either side. 
By this methed two rows are left between the unsprayed row 
and the sprayed rows measured. This is desirable for the reason 
that an unsprayed row next to a sprayed row is sure to receive 
some benefit from spray falling upon it accidentally; and 
a sprayed row next to an unsprayed one does not have a fair 
chance, because it is less thoroughly sprayed than the other rows 
in the field and is also more exposed to blight.** 
Those having four-row sprayers may prefer to leave four un- 
sprayed rows, in order that they may use their sprayer in apply- 
ing poison for bugs. In such a case we would advise measuring 
the crop on the middle two unsprayed rows and on the second 
sprayed row on either side. 
The greater the length of the sprayed and unsprayed rows 
measured the better. They should be at least 25 rods long. 
Yields per acre based upon the weight of a few hills are unde- 
sirable. 
MISCELLANEOUS INFORMATION ON POTATO BLIGHT 
AND SPRAYING.** 
CONCERNING THE NUMBER OF SPRAYINGS., 
“There is great diversity of opinion as to the number of spray- 
ings which is most profitable. Some hold that two or three 
sprayings are sufficient. Others would spray frequently through- 
out the whole season. 
“ Conditions vary so much that no invariable rule can be made. 
The farmer must rely chiefly on his own Judgment. Probably 
the rule which most nearly fits all cases, and the one to be fol- 
8 Hor an example of this see Table X showing yields in the West Henrietta 
experiment, p. 112. 
“The matter included under this head is copied from Farmers’ Institute 
Bulletin No. 2. Syllabus of Ilustrated Lecture on Potato Diseases and 
Their Treatment. By F. C. Stewart and H. J. Eustace. Published by U. S. 
Dept. of Agr. Office of Experiment Stations, 1904. 
