resorts and campgrounds. Systemic insecticides may be applied by trunk implanta- 
tion or injection (837, 538), by banding or spraying the circumference of the trunk, 
by spraying the foliage, by treating the soil around the base of trees (55, /364), or 
by dipping seedlings or cuttings before planting (57, 320, 703, 537, 874, 940, 
EST): 
F-482299 
Figure 1.—Airplane-spraying for spruce budworm 
control. 
“ 
x 
F-517833 
Figure 2.—Mist-blower application of insecticide to pine 
trees in a seed orchard. 
15 
