Spring rains may wash the boring dust off the top surfaces, but it can usually be found in bark crevices or on the ground beneath the slash. In standing trees, boring dust lodges in bark crevices, spider webs, and on the ground at the base of the tree. Foliage of infested standing trees usually begins fading within a few months of attack. The rate of fading depends on tree species and weather. Some infested trees may fade by late summer or early fall during the same year they are attacked, while others may not fade until the following spring.
Eggs are oval, pearly white and about the size of a pinhead.
Larvae are creamy-white, legless grubs with brown heads. The pupa is soft and white, with some adult features such as eye spots and wing covers. The third spine in the male is more prominent than that of the female. Note prominent posterior declivity and spines. Pheromone attractants released by the male attract one to seven females, though typically two or three.