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Side trimming is necessary when the ends of the limbs on the side of a tree extend into or over the wires. In these cases, the limbs are cut off at a crotch so the limb can continue to grow, but in a direction parallel to or away from the line wires. The amount of trimming needed depends on the size and location of the limbs. Side trimming usually results in notches or an unbalanced tree that looks unsightly. When this is the case, branches or limbs not interfering with wires should be trimmed from the other side so that the tree is balanced.

c. Top trimming. Top trimming is necessary when a tree is growing into the wires. The ends of the

BEFORE AFTER

a Center Trimming

BEFORE AFTER

b Side Trimming

BEFORE AFTER

C. Top Trimming Figure 4-25. Tree trimming to clear electric wires

4-31

TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

upper branches are cut off to form a well-shaped, low-spreading head below the wires. The natural shape of the tree should be retained as nearly as possible. For tall-growing trees, however, under-trimming or topping the tree is often necessary. Trees usually topped are willow, cottonwood, and poplar. These trees grow rapidly, even after being topped, and have branches more easily broken during storms. A tree topped in this manner usually grows a bushy or broomlike top, which will require more topping in a few years.

d. Undertrimming. Undertrimming is necessary when the under branches of a tree overhang or extend into wires.

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