Asian Longhorned Beetle
Invasive species, native to China, Japan and Korea. Damage occurs through larvae gallery boring and exit holes which weaken the tree’s integrity.
Maples, horse chestnut, elm, poplar, willow and other hardwoods
Threat to Trees
Severe (but not currently a threat to local trees)
After infestation by a number of generations of beetles, the integrity and vascular tissue of the tree will be threatened, causing structural weakness that may kill the tree.
Signs & Symptoms
Cambial galleries, later progressing to oval-shaped tunnels in the sapwood and heartwood. Round emergence holes, frass expulsion, dead or dying tree limbs or branches when there has been no drought.
Adults are very large black insects with white markings. Bodies range from 1 to 1.5 inches with antennae as long as 4 inches. Beetles can fly but only short distances. Their life cycle requires one to two years to complete. They overwinter as larvae or pupae. The beetles require one to three years to reach maturity, with a lifespan of approximately 50 days for males and 66 days for females. Emergence in late May through October.
New York City 1980s, first reported infestation in 1996
New York City, Chicago and Eastern Illinois, New Jersey, Massachusetts