297 
It has been found for general wood- 
land spraying, where there is consider- 
able length of hose, from 200 to 300 
pounds or more pump pressure is neces- 
sary, and in extreme cases, when the 
spraying operations are on considerable 
height above the sprayer, even 350 
pounds is used. 
There are many different kinds of ap- 
paratus for spraying, from the little 
hand bucket pump to the power sprayer. 
Just what sprayer will be the best will 
PUMP OF DEMING SPRAYER. 
depend largely upon the size and nature 
of the work. 
It is advisable always to get a good 
spray pump large enough for — and even 
a little larger than — present require- 
ments. The pump should have a good, 
agitation. This is an important item in 
order to insure an equal distribution of 
the spray mixture. Cheap nozzles and 
cheap pumps are poor economy. They 
get out of order and are not made to do 
the work properly. 
Spraying carelessly done, at the wrong- 
time or with inefficient machinery, will 
fail. The work must be done thor- 
oughly, so that every limb, leaf or bit 
of trunk is covered, but not drenched, 
so that the solution will run off. Trees 
should be sprayed when dry, but not 
when the sun is very hot, as this may 
scald foliage. A good mist spray must 
have sufficient power back of it to drive 
it into every crack and crevice of the 
bark and into contact with every leaf 
and twig. Use a good outfit and the 
best materials you can buy. 
Don’t begin spraying until you are 
sure you have the correct information 
on the subject, for failures are generally 
OWEN COMPRESSED AIR SPRAY- 
ER BEING LOADED FOR USE. 
FITZHENRY-GUPTILL HIGH POWER SPRAYERS DOING FORESTRY WORK IN 
MASSACHUSETTS. CENTER PICTURE SHOWS BATTERY OF SPRAYERS USED BY 
MASSACHUSETTS HIGHWAY COMMISSION ON EXTENSIVE NORTH SHORE SPRAY- 
ING AT BOSTON. 
the result of ignorance or are due to im- 
perfect and inefficient pumps and ap- 
paratus; imperfect understanding of 
what to spray for; the wrong mixture, 
or delaying spraying till too late or after 
the damage is done. 
See that the pumps and rigs are in 
working order before spraying time 
comes. Order your materials. Pattern 
after the bugs; be ready. Get a good 
pump, one that works easily and 
smoothly and is strong enough to make 
a fine spray when two lines of hose and 
four nozzles are used if designed for 
field work; it is economy in the end. 
Look over the advertisements for spray- 
ing outfits and write for circulars. Con- 
sult bulletins of all experiment stations 
on the special needs of your work to 
solve your spraying problems. 
The chemicals must be applied to the 
tree in the form of a mist so as to 
cover and penetrate all of its parts. To 
break the liquid into a mist the proper 
nozzle is required and a pressure of from 
100 to 300 pounds, or even more. This 
misty spray will not carry far through 
the air, no matter what pressure is be- 
hind it, so that it is necessary to elevate 
the nozzles to within a few feet of the 
part of the tree to be sprayed. For the 
tall trees it is necessary for the operator 
to work from an elevated staging or 
tower so that with the aid of a 10-foot 
or 12-foot extension rod the top branches 
of the tree can be sprayed as thoroughly 
as the lower branches. On account of 
the high pressure needed to do this work 
properly the power sprayer has come to 
the front rapidly. The high pressure 
