Online Insect Identification

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Household and Industrial
Household, Yard, and Structural Pest Identification (Virginia Tech)
Northwest Wood Destroying Pests (Washington State Univ.)
Wood Destroying Insects (Massey Services)
Carpenter Bees (Univ. of Toronto)
Carpenter Ants (Univ. of Toronto)
Cockroach Identification Key (Univ. of Nebraska)
Firewood Insects (Ohio State Univ.)
Illustrated Termites of North America (Univ. of Toronto)
Powder-post Beetles (Univ. of Toronto)
False Powder-post Beetles (Univ. of Toronto)

Row Crops, Vegetables and Forages
Common Insect and Mite Pest of Vegetables (Identified by Crop) (Virginia Tech)
Images of Vegetable Pests (Virginia Tech)
Pictorial key for identifying some common late-instar caterpillars found on corn (Iowa State)

Fruit
Fruit Insect Pest and Natural Enemy Photographs (West Virginia Univ.)

Horticulture and Ornamental
Insect Pests of Ornamental Plants Slide Show (Virginia Tech)
Photo Gallery of Insects and Mites on Ornamental Plants (North Carolina State Univ.)
Caterpillars That Feed on Trees and Shrubs (North Carolina State Univ.)
Christmas Tree Pests Slide Show (Virginia Tech)

Public Health Insects
Computerized Disease Vector Identification Keys (Mosquitoes, US Army)

Identification Labs
Purdue Virtual Diagnostic Lab
Virginia Tech Pest Identification Lab