Emerald ash borer (EAB) Categories: Fact Sheet High Alert Invasive Insects Last review date: 2026-11-01 08:59 Last edit date: 2026-10-15 Without intervention, a city can expect to lose 90% to 100% of its ash trees within about a decade of infestation by the emerald ash borer, according to the Washington State Department of Natural Resources.Photo […]
Bagworms Categories: Fact Sheet Nuisance Pests Last review date: 2025-12-22 04:21 Last edit date: Cigar case bagwormsPhoto by: Art Antonelli Biology Bagworms belong to a moth family called psychodidae. Their larvae live inside of peculiar cases or bags which they make from various plant materials or sand. Some species have wingless, legless, worm-like females that […]
Brown marmorated stink bug Categories: Fact Sheet Nuisance Pests Last review date: 2026-09-14 09:31 Last edit date: Adult brown marmorated stink bugPhoto by: David R. Lance, USDA APHIS PPQ, Bugwood.org Biology The brown marmorated stink bug (BMSB) is an introduced species that is very mobile and spreading quickly across the United States. Both nymphs and […]
Centipedes Categories: Fact Sheet Nuisance Pests Last review date: 2026-08-27 10:25 Last edit date: CentipedePhoto by: Roger Akre Biology Centipedes are a class of arthropods related to insects. Centipedes are very fast moving and flat. Centipedes have a pair of poison jaws that assist them in overcoming prey. Hence they are considered beneficial predators. Centipedes […]
Clover mites Categories: Fact Sheet Nuisance Pests Last review date: 2025-08-27 05:07 Last edit date: Clover mite Photo by: Unknown Biology Clover mites are small (1/100 of an inch long), oval-shaped reddish-brown mites and occasional household pests. A clover mite’s front legs are typically longer than the other three pairs of legs and can be […]
Cluster flies Categories: Fact Sheet Nuisance Pests Last review date: 2026-09-13 11:44 Last edit date: Cluster flies rests on a leaf.Photo by: Whitney Cranshaw, Colorado State University, Bugwood.org Biology Cluster flies resemble house flies, but are larger and slower in movements. They are about 5/16 inch long, dark gray with black and gray checkered abdomens. […]
Cockroaches Categories: Fact Sheet Nuisance Pests Last review date: 2025-12-15 12:29 Last edit date: Oriental Cockroach and Egg CasePhoto by: M. Bush Biology Cockroaches are flat insects that are found in a variety of colors. There are four common pest species: The German cockroach The German cockroach is most commonly found in the Pacific Northwest. […]
Firebrats Categories: Fact Sheet Nuisance Pests Last review date: 2025-03-23 11:58 Last edit date: FirebratPhot by: Unknown Biology Firebrats are wingless, fast-moving insects about 1/2 inch long. They have two long antennae on their head and three long bristles on their tail. Firebrats are mottled tan in color and prefer to live in very warm […]
Fruit flies Categories: Fact Sheet Nuisance Pests Last review date: 2025-12-15 03:41 Last edit date: Fruit or vinegar flyPhoto by: M. El Damir, Bugwood.org Biology Fruit flies are a common and annoying problem in homes, restaurants, supermarkets, and any other place where there is rotting and fermenting food. Fruit flies can be a problem any […]
Fungus gnats Categories: Fact Sheet Nuisance Pests Last review date: 2025-12-22 04:17 Last edit date: Dark winged fungus gnatPhoto by: Ken Gray Biology Fungus gnats are small (1/8 inch) gray-black flies often noticed around houseplants and windows. Most species inhabit fungi or dead plant material, but a few species have maggots that injure plant roots. […]