194. REPORT OF THE BOTANICAL DEPARTMENT OF THE 
of copper sulphate to each 50 gallons.®® Whenever bugs or flea- 
beetles are plentiful add one pound of paris green or two quarts 
of arsenite of soda stock solution (See p. 190) to the quantity of 
bordeaux required to spray an acre. 
Thoroughness of application is to be desired at all times, but 
is especially important when flea-beetles are numerous or the 
weather favorable to blight. Using the same quantity of bor- 
deaux, frequent light applications are likely to be more effective 
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 spray- 
ing once in two weeks. 
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 as 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. IExcept, 
perhaps, on small areas, it does not pay to apply poison alone for 
bugs. When it is necessary to fight insects use bordeaux mix- 
ture and poison together. 
For the preparation of bordeaux mixture see footnote on page 94. 
