Two-lined chestnut borer gets its common name from being a historically significant pest of American chestnut trees, prior to the trees' large-scale decimation from chestnut blight. Also, check out those two lines on its back!
A. bilineatus begins to emerge in late spring and remains active through late summer. Adults feed on upper canopy foliage of Quercus and mate on trunk and branches. Females lay eggs in clusters in crevices of bark.
One to two weeks after ovipositing, larvae hatch and burrow into host cambium, creating meandering galleries. Mature larvae create a pupal chamber for overwintering in the outer bark.
Larvae feed on tree phloem, cambium, and xylem, and can effectively girdle the tree host (Haack).
Prefers weakened hosts
A. bilineatus is native to North America and is estimated to span the native range of Quercus species (Haack).
Quercus species, particularly:
Maintaining tree health is the single most important step to avoiding attack from A. bilineatus. When symptoms of A. bilineatus attack manifest visually, the tree is already beyond saving.
Practices that bolster tree vigor in forested areas include:
(for landscape trees)