OREGON STATE UNIVERSITY

Oregon Look-Alikes

There are a number of native and naturalized insects in Oregon that may be confused with the emerald ash borer and Asian longhorned beetle. Use the images and links below describing these look-alikes to help you determine if you have found an actual EAB or ALB.

Emerald Ash Borer Look-Alikes

Photo Credit: Oregon Department of Agriculture
Bronze birch borer (Agrilus anxius)
Length: 5.5 to 13.0 mm (similar size to EAB)
Description: Bronze-black with faint reddish, greenish, or purplish reflections
Hosts: birch (Betula)

Photo Credit: Oregon Department of Agriculture
Agrilus politus
Length: 4.7 to 8.5 mm (smaller than EAB)
Description: Coppery-red to green to bluish-green
Hosts: maple (Acer) and willow (Salix)
 
Photo Credit: Oregon Department of Agriculture
Hawthorn root borer (Agrilus vittaticollis)
Length: 8.0 to 9.7 mm (similar size to EAB)
Description: Purplish-red head with brassy tinge and two dark longitudinal stripes
Hosts: serviceberry (Amelanchier), hawthorn (Crataegus), apple (Malus), pear (Pyrus), and wild cherry and chokecherry (Prunus)

Photo Credit: Oregon Department of Agriculture
Lang's Buprestid (Buprestis langii)
Length: 13.0 to 21.0 mm (larger than EAB)
Description: Bright green or blue-green with faint brassy reflections (broader and flatter than EAB)
Hosts: Douglas-fir (Pseudotsuga), willow (Salix), and alder (Alnus)

Photo Credit: Oregon Department of Agriculture
Golden Buprestid (Buprestis aurulenta)
Length: 13.0 to 22.0 mm (larger than EAB)
Description: Bright green with brassy and bluish reflections and coppery-red margins on wings (broader and flatter than EAB)
Hosts: fir (Abies), pine (Pinus), Douglas-fir (Pseudotsuga), and western redcedar (Thuja plicata)

Photo Credit: Gary L. Parsons
Anthaxia deleta
Length: 4.0 to 6.3 mm (smaller than EAB)
Description: Bright green with faint blue body (wider and flatter than EAB)
Hosts: willow (Salix), water birch (Betula occidentalis), dogwood (Cornus), and alder (Alnus)

Photo Credit: Oregon Department of Agriculture
Klammath weed beetle (Chrysolina quadrigemina)
Length: 6.0 to 7.0 mm in diameter (smaller than EAB)
Description: Can be green, bronze, purple, and/or blue with slight metallic sheen
Hosts: klammath weed (Hypericum perforatum)

Photo Credit: Oregon Department of Agriculture
Chrysophana placida
Length: 6.0 to 10.5 mm (smaller than EAB)
Description: Blue or green with coppery spot on head and broad coppery-red stripe down each wing
Hosts: pine (Pinus), hemlock (Tsuga), fir (Abies), Douglas-fir (Pseudotsuga), western redcedar (Thuja plicata)

Photo Credit: Gary L. Parsons
Ctenicera resplendens
Length: 10.0 to 15.0 mm (slightly larger than EAB)
Description: Bright green with brassy/coppery reflections
Hosts: Unknown (likely herbaceous roots, rotting wood, or predation)
Note: Click beetle family (Elateridae)

Photo Credit: Gerald J. Lenhard
Temnoscheila chlorodia
Length: 8.6 to 17.8 mm (slightly larger than EAB)
Description: Bright green or blue with brassy reflections and a narrow waist
Hosts: Predator of wood-boring beetles
Note: Bark-gnawing beetle family (Trogossitidae)
Asian Longhorned Beetle Look-Alikes  

Photo Credit: Oregon Department of Agriculture
Banded alder borer (Rosalia funebris)
Length: 2.3 to 4.0 cm (similar size to ALB)
Description: Broad black and white stripes with large black spot on segment behind head; black and white banded antennae
Hosts: primarily dead maple (Acer), alder (Alnus), oak (Quercus), willow (Salix)

Photo Credit: Oregon Department of Agriculture
Oregon fir sawyer (Monochamus scutellatus oregonensis)
Length: 1.9 to 3.2 cm (smaller than ALB)
Description: Black body with small white spots/speckles; black and white banded antennae; body is rough like an orange peel
Hosts: fir (Abies), larch (Larix), spruce (Picea), pine (Pinus), Douglas-fir (Pseudotsuga), and hemlock (Tsuga)
Notes: male (left) and female (right)

Photo Credit: Oregon Department of Agriculture
Citrus longhorned beetle (Anoplophora chinensis)
Length: 2.1 to 3.7 cm (similar size to ALB)
Description: Shiny black body with 10 to 12 white spots; large and stout
Hosts: 100+ species; Primary hosts include citrus (Citrus), apple (Malus), trifolate orange (Poncirus trifoliata), poplar (Populus), willow (Salix), Australian pine (Casuarina equisetifolia)
NOTE: This is another high priority invasive insect. If you think you have found a citrus longhorned beetle, please report it immediately.

Photo Credit: Jon Yuschock
Locust borer (Megacyllene robiniae)
Length: 1.2 to 2.0 cm (smaller than ALB)
Description: Bright yellow; W-shaped bands on a black body with reddish legs and black antennae
Hosts: black locust (Robinia pseudoacacia) and stressed oak (Quercus)

Photo Credit: Oregon Department of Agriculture
Xylotrechus longitarsus
Length: 1.5 to 2.0 cm (smaller than ALB)
Description: black body with white, spotted markings
Hosts: stressed Douglas-fir (Pseudotsuga)

Photo Credit: Oregon Department of Agriculture
Ponderosa Sawyer (Ergates spiculatus)
Length: ~5.0 cm (larger than ALB)
Description: Dull reddish-brown wings; black head/thorax and long antennae
Hosts: primarily stressed Douglas-fir (Pseudotsuga) and ponderosa pine (Pinus ponderosa)
Note: male (left) and female (right)

Photo Credit: Oregon Department of Agriculture
California prionus (Prionus californicus)
Length: ~5.0 cm (or slightly larger; larger than ALB)
Description: Shiny reddish-brown to black; long, segmented antennae
Hosts: oak (Quercus) and madrone (Arbutus) and some conifers

Additional Identification Resources

Michigan State EAB Identification Guide

Washington State ALB Guide 1

Washington State ALB Guide 2 (more examples and detail)

USDA ALB Guide