Cottonwood Borer Identification Guide

Key Visual Features

The cottonwood borer is a large, striking longhorn beetle, typically 2.5-3.8 cm (about 1-1.5 inches) long, easily recognized by its bold black-and-white or cream checkered pattern covering the body and wing covers. The pattern often forms irregular blocks or bands rather than a perfectly even checkerboard. Like other longhorn beetles, it has very long antennae, often nearly as long as or longer than the body, banded in alternating light and dark segments. The body is elongated and cylindrical, with a hard, textured shell, and the legs are long and sturdy.

Where and When You're Likely to See Them

This beetle is found throughout much of the central and eastern United States, wherever cottonwood, willow, and poplar trees grow, since larvae develop by tunneling in the roots and lower trunk of these trees. Adults are most active during the warmer months, typically summer, and can be seen resting on tree trunks, low branches, or on the ground near the base of host trees during the day. They are relatively slow-moving and often allow close observation.

Similar-Looking Bugs

The cottonwood borer's bold black-and-white pattern is fairly distinctive among longhorn beetles, but it can be confused with other large patterned longhorns, such as certain sawyer beetles, which tend to have more mottled gray or brown coloring rather than sharp black-and-white blocks. Some other longhorn species have spotted rather than blocky patterning, which helps distinguish them at a glance. The combination of large size, checkered black-and-white pattern, and association with cottonwood or willow trees is usually enough to confirm identification.

Quick ID Checklist

• Large longhorn beetle, 2.5-3.8 cm long
• Bold black-and-white or cream checkered/blocky pattern
• Long, banded antennae nearly as long as or longer than the body
• Found on or near cottonwood, willow, and poplar trees
• Active during summer, often resting on trunks or low branches