Columbia arborist Chad Herwald inspects trees at Lenoir Woods

July 10, 2012 | 6:00 a.m. CDT

Arborist Chad Herwald examines trees at in Lenoir Woods determining their condition and recommending how they should be treated during construction.

Chad Herwald, the Columbia city arborist, inspects trees July 2 at Lenoir Woods, where the city is installing a new underground transmission line. | Yi Gan

Arborist Chad Herwald analyzes an elm tree July 2 in Lenoir Woods by touching its bark, as he tries to determine if there are insects, fungi or borers in the tree. After determining the heath condition of a tree, he will decide how it should be handled during the construction of a new underground transmission line. | Yi Gan

Columbia arborist Chad Herwald examines oak leaf galls found on a pin oak during his inspection July 2 at Lenoir Woods. According to Herwald, leaf galls will stress the tree a little and make it more susceptible to skeletonizing insects.

| Yi Gan