Description: species of lepidopteran with a 20-35 mm. Span that attacks cottonwoods and willows.
Number of annual generations: a single generation a year.
Damage: the larvae dig galleries in the trunks and branches of the tree when feeding. The damage to the branches weaken them and they may break in the wind. In general, the galleries affect the quality of the wood, making it unusable commercially. The wounds also facilitate entry of secondary pathogens.