Explanation of Names
Agrilus planipennis Fairmaire 1888
adult 7.5-14 mm (males smaller than females); larva up to 32 mm
Adult: elytra bright metallic green; pronotum golden-green; ventral surface lighter yellowish-green (with fine hairs in males, lacking in females); body narrow and elongate; head flat; eyes kidney-shaped, black; dorsal surface of abdomen metallic purplish-red, visible when wings are spread
generally larger and brighter green than native NA spp.
Larva: body white to cream-colored, dorso-ventrally flattened; head brown, mostly retracted into prothorax; abdomen 10-segmented with pair of brown pincer-like appendages on last segment; segments 5-8 widen posteriorly, giving the abdomen a serrated appearance when viewed from above
native to E. Asia, accidentally introduced to N. Amer., established around the Great Lakes (see distribution map
) and has spread as far as CO, AR, and GA.
adults in spring and summer; larvae in summer and fall
hosts: Fraxinus spp.; larvae feed on inner bark of ash trees, disrupting the flow of water and nutrients, and killing infested trees within 1-4 years; adults feed on ash leaves
one generation per year; overwinters as larva in outer sapwood/bark; pupate in April-May; adults emerge in late spring through D-shaped exit holes and lay eggs on host tree; larvae chew through outer bark and bore S-shaped tunnels in inner bark until late fall, then stop feeding
Accidentally introduced with imported packaging/crating wood, probably in the late 1990s; first reported in se. MI and sw. ON in 2002.
A highly destructive pest and a major economic & environmental threat to urban and forested areas of eastern NA
Wasp (Cerceris fumipennis
) preys on this species and is used to detect the presence of EAB (more here