Roundheaded (Longhorned) borers
Adult roundheaded borers are medium to large, elongate,
cylindrical beetles that are often brightly colored. They
have long antennae, so are sometimes called longhorned borers
or beetles. One common species, the poplar borer (Saperda
calcarata) attacks aspen, cottonwood, poplar, and willow.
Information about the eucalyptus longhorned borer, shown
at right, is detailed in the eucalyptus
longhorned borer Pest Note.
Holes in bark and stains or oozing liquid on limbs or trunks are common symptoms of damage by roundheaded
borers. Foliage may discolor and wilt, limbs may die back, and branches or entire plants may be killed.
However, roundheaded borers attack mostly damaged or dying plants; vigorous trees are rarely attacked.
Plant species that are well adapted to each location and provide them with proper cultural care. Protect
trees from injuries. Remove dead limbs or trees promptly and do not store freshly cut wood near trees;
beetles may emerge and attack nearby plants. Pesticide applications to bark have not been found to be