














There are times when the spray 
rig, regardless of its capacity and 
force, is helpless. Extremely tall trees 
and close growing undergrowth can- 
not be reached with spray. It is im- 
possible to spray in cemeteries and 
parks having marble monuments 
which cannot be sprayed with certain 
materials because of stain. It is at 
these times that dusting is the only 
method for controlling plant pests 
and diseases. Inspection now may 
prevent future insects and infesta- 
tions. 
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