Asian Longhorned Beetle vs. Cottonwood Borer.
Asian Longhorned Beetle-Anoplophora glabripennis (Motschulsky). Cottonwood Borer-Plectrodera scalator (Fabricius).
Asian Longhorned Beetle
Anoplophora glabripennis (Motschulsky)

  Cottonwood Borer
Plectrodera scalator (Fabricius)
Hosts: Prefers maple species; also infests horsechestnut, elms, birches, willows, and poplars. Attacks the upper tree crown initially, then larger branches and the main stem in subsequent years. Hosts: Prefers eastern cottonwood; also infests other poplars and willows. Attacks the root collar and main roots of young trees.
         
Overall Appearance: Glossy jet black; very smooth with up to 20 distinct white spots on the back.   Overall Appearance: Black with numerous white cross stripes formed by dense growths of white hairs.
         
Size: 3/4 to 1 1/4 inches (20 - 32 mm) long.   Size: 1 to 1 1/2 inches (25 - 38 mm) long.
         
Antennae: Black with distinctive white bands on each segment. Antennae are 1 1/2 to 2 1/2 times the body length.   Antennae: Solid black and nearly as long as the body.
         
Feet: Distinct bluish tinge, especially on the tops of the feet.   Feet: Black with white hairs protruding between the segments.
         
Adults Present: May through October.   Adults Present: Late May through mid-August.
         
Distribution: Native to China and Korea. Has been introduced into the United States in solid wood packing material.   Distribution: Native to the United States. Most common in the Southeast, but found from New York to Georgia to Texas to Montana

Descriptions by: Photo credits:
Russ McKinney, USDA APHIS-PPQ, Topeka, KS
Don Duerr, USDA Forest Service, Pineville, LA
Dennis Haugen, USDA Forest Service, St. Paul, MN
Asian Longhorned Beetle
  USDA APHIS
Cottonwood Borer
  Stephen C. White, Kansas Department of Agriculture
USDA Forest Service Shield. Northeastern Area, State and Private Forestry. NA-PR-04-00
horizontal ruler.