Small clusters of longer hairs occur at the lower outer edges of each body segment. Identifying the Injury. Later the entire needle may die, causing the whole tree to become brown as though scorched by fire. Occasionally, only the tips of the needles show signs of injury. Trees do not die, and little or no growth loss results.
Attacks usually occur in early summer.
By late summer the trees appear green and healthy again. Eggs are laid on herbaceous undergrowth during the summer. Larvae emerge, feed on roots of grasses and other vegetation, and overwinter in this stage. Under forest conditions, no control measures are recommended. On ornamentals and shade trees, insecticides can be used to prevent unsightly damage.