New York AGRICULTURAL EXPERIMENT STATION. 251 
than heavier applications made at long intervals; e..g., when a 
horse sprayer carrying but one nozzle per row is used, it is 
better to go over the plants once a week than to make a double 
spraying once in two weeks. A good plan is to use one nozzle 
per row in the early sprayings and two nozzles per row in the 
later ones. 
Those who wish to get along with three sprayings should post- 
pone the first one until there is danger of injury from bugs 
or flea beetles and then spray thoroughly with bordeaux and 
poison. The other two sprayings should likewise be thorough 
and applied at such times as to keep the foliage protected as 
much as possible during the remainder of the season. Very 
satisfactory results may be obtained from three thorough 
sprayings. 
A single spraying is better than none and will usually be 
profitable, but more are better. Spraying may prove highly 
profitable even though the blight is only partially prevented. 
It is unsafe to postpone spraying until blight appears. Ex- 
cept, perhaps, on small areas, it does not pay to apply poison 
alone for bugs. When it is necessary to fight insects use 
bordeaux mixture and poison together. 
SPRAYING IN DRY SEASONS. 
The past season being a very dry one over the entire State 
we have had exceptional opportunities for observing the effect 
of spraying potatoes in dry weather. An examination of 
Table XVIII shows that in nine of the fourteen business ex- 
periments spraying proved profitable while in the remaining 
five it was unprofitable. Notwithstanding dry weather and 
the absence of late blight the business experiments show an 
average increase in yield of 18.5 bu. per acre due to spraying 
and an average net profit of $8.53 per acre. Our observations 
convince us that it is unwise to neglect spraying in dry seasons. 
Even when there is no blight five or six sprayings should be 
made during the season. In dry weather the wounding of 
the leaves by bugs, flea beetles and other insects is more in- 
eo 
