Pests to know in Idaho
Pests documented in Idaho
Many public records (264)
- Aedes dorsalis
- Aerial yellowjacket
- Alfalfa Looper
- Alfalfa weevil
- Ambush Bugs
- American hornet moth
- American Mink
- American red squirrel (pine squirrel)
- American Sand Wasp
- American yellowjacket
- Aphid Flies (Silver Flies)
- Apple-and-Thorn Skeletonizer
- Ash/Lilac Borer
- Asparagus Beetles
- Azalea Bark Scale
- Bald-faced Hornet
- Balsam Woolly Adelgid
- Banded alder borer
- Banded ash borer
- Banded Garden Spider
- Barn Funnel Weaver
- Beaver (American beaver)
- Beewolf
- Bertha Armyworm
- Big Poplar Sphinx (Modest Sphinx)
- Big-eyed toad bug
- Bigheaded grasshopper
- Billbugs
- Birch Leafminer
- Bird cherry-oat aphid
- Black and Yellow Mud Dauber
- Black Vine Weevil
- Black-tailed bumble bee
- Blackjacket
- Blister Beetles
- Blue-legged grasshopper
- Bold Jumping Spider
- Boxelder Bug
- Boxelder Leafroller
- Bronze knapweed root borer
- Brown-belted bumble bee
- Brown-spotted grasshopper
- Bulb Flies
- Bumble Flower Beetle
- Burying beetles
- Cabbage Aphid
- Cabbage seedpod weevil
- Canada Goose
- Canada thistle bud weevil
- Carolina Grasshopper
- Cattail Mosquito
- Celery Looper
- Cereal leaf beetle
- Chalcoela Moths
- Checkered White
- Cherry leafhopper
- Clear-winged grasshopper
- Cliff swallow
- Clover leaf weevil
- Clover root curculio
- Codling Moth
- Common Carpet Beetle
- Common Pillbug
- Consperse stink bug
- Convergent Lady Beetle
- Cooley Spruce Gall Adelgid
- Coyote
- Crab Spiders (e.g., goldenrod crab spider)
- Crane Flies
- Cuckoo wasps
- Currant Borer
- Darkling Beetles (Stink Beetles)
- Darksided Cutworm
- Dawson grasshopper
- Deer (white-tailed deer shown; mule deer similar)
- Deer Mouse
- Digger bees
- Dingy Cutworm
- Douglas-fir Beetle
- Douglas-fir Tussock Moth
- Drone Fly and Rat-Tailed Maggot
- Eastern Spruce Gall Adelgid
- Ebony bugs
- Elm Leaf Beetle
- Elm Seed Bug
- English grain aphid
- European Elm Scale
- European Paper Wasp
- European Pine Shoot Moth
- European starling
- European Wool Carder Bee
- Face Fly
- False Celery Leaftier
- Field Ants
- Field Crickets
- Filament Bearer (Horned Spanworm)
- Filbert Leafroller
- Fir Coneworm
- Fir engraver
- German Yellowjacket
- Giant Conifer Aphids
- Giant Water Bugs
- Giant Willow Aphid
- Glassy Cutworm
- Golden buprestid
- Golden northern bumble bee
- Grass Spiders (Funnel Weavers)
- Grass-Carrying Wasps
- Grasshoppers
- Great Blue Heron
- Greater Angle-Winged Katydid
- Green Fruitworms
- Greenstriped Forest Looper
- Harvestmen (Daddy Longlegs)
- Hemlock Looper
- Hobo Spider
- Hollyhock Weevil
- Hop Looper
- Horntails (Wood Wasps)
- House Fly
- House sparrow (English sparrow)
- Human Flea
- Imported Cabbageworm
- Inland Floodwater Mosquito
- Jerusalem Crickets
- Katydids
- Kiowa grasshopper
- Klamathweed beetles
- Knapweed flower weevils
- Knapweed root weevil
- Lacanobia Fruitworm
- Larder Beetle
- Large Yellow Underwing
- Leafcurl Ash Aphid
- Leafcutter Bees
- Lilac Root Weevil
- Lima Bean Pod Borer
- Locust Borer
- Marmots
- Masked Hunter
- Mason Bees
- Meadow grasshopper
- Meal Moth
- Migratory grasshopper
- Miller Moth (Army Cutworm Moth)
- Mineola Moth
- Mormon cricket
- Morrison's Pero
- Mosquito
- Mottled sand grasshopper
- Mountain Lion
- Mountain Pine Beetle
- Muskrat
- Nine-spotted lady beetle
- North American Racer
- Northern House Mosquito
- Oil beetles
- Orange-legged grasshopper
- Oystershell Scale
- Packard grasshopper
- Painted Lady
- Pallid-winged grasshopper
- Pandora Moth
- Pavement Ant
- Pea weevil
- Peachtree Borer
- Phorid Fly
- Pigeon (feral rock pigeon)
- Pigeon tremex
- Pine Needle Scale
- Pine Sawyers
- Pine White Butterfly
- Pitch Moths
- Pocket gophers
- Poplar and Willow Borer
- Poplar Carpenterworm
- Porcupine (North American porcupine)
- Praying Mantids
- Prionus Root Borers
- Rattlesnakes (western diamondback shown)
- Red firebug (European firebug)
- Red Fox
- Red turnip beetle
- Red-belted bumble bee
- Red-shanked grasshopper
- Red-winged grasshopper
- Redbacked Cutworm
- Redheaded Ash Borer
- Redshouldered stink bug
- Ring-billed Gull
- River otter (North American river otter)
- Rocky Mountain Wood Tick
- Rose Curculio
- Rose gall wasps
- Rose Stem Girdler
- Rose-grain aphid
- Rough Stink Bugs
- Rough strawberry root weevil
- Rusty Tussock Moth
- Sandhill Crane
- Satin Moth
- Say stink bug
- Sevenspotted Lady Beetle
- Shrews (northern short-tailed shrew)
- Silverfish
- Small Milkweed Bug
- Snakeweed grasshopper
- Spider Beetles
- Spiny Elm Caterpillar (Mourning Cloak)
- Spirea Aphid
- Spitting Spider
- Spittlebugs
- Spotted alfalfa aphid
- Spotted bird grasshopper
- Spotted Cutworm
- Squash Bug
- Strawberry Crown Moth
- Strawberry Root Weevil
- Striped grasshopper
- Striped skunk
- Sugarbeet root aphid
- Sunflower seed weevils
- Sweat Bees
- Ten-lined June Beetle
- Thatching Ants
- Thistle seedhead weevil
- Thistle Stem Gall Fly
- Toadflax stem weevils
- Tobacco Moth
- Tree squirrels (eastern gray and fox squirrels)
- Twicestabbed Lady Beetle
- Twospotted Lady Beetle
- Twostriped Grasshopper
- Unicorn Caterpillar
- Valley grasshopper
- Viceroy
- Voles (meadow mice)
- Water striders
- Weasels (long-tailed weasel and relatives)
- Western ambrosia beetles
- Western black carpenter ant
- Western Black Widow
- Western blood-red lady beetle
- Western boxelder bug
- Western Cherry Fruit Fly
- Western Conifer Looper
- Western Conifer Seed Bug
- Western Encephalitis Mosquito
- Western False Hemlock Looper
- Western harvester ant
- Western Honey Bee
- Western Poplar Clearwing
- Western Spruce Budworm
- Western tarnished plant bug
- Western Tent Caterpillar
- Western Yellowjacket
- Western Yellowstriped Armyworm
- Whitelined Sphinx
- Whitetriangle Leafroller
- Wild turkey
- Woodlouse Spider
- Yellow Sac Spider
- Yellow starthistle weevils
- Zebra Jumping Spider
Fewer public records (193)
- Agave Snout Weevil
- Alfalfa caterpillar (orange sulphur)
- Alfalfa plant bug
- American Black Bear
- American crow
- American Dagger Moth
- Aphids
- Argyrotaenia dorsalana
- Artichoke aphid
- Aspen Leaf Miner
- Aspen Twoleaf Tier
- Assassin Bugs
- Backswimmers
- Banded Woolly Bear
- Bat Bugs
- Bats (big brown bat and little brown bat)
- Bean Weevil
- Bee Flies
- Beet Webworm
- Bigeyed Bugs
- Black Soldier Fly
- Black Witch
- Black-tailed Jackrabbit
- Blinded Sphinx
- Braconid Wasps
- Brown Marmorated Stink Bug
- Brown Stink Bug
- Bruce Spanworm
- Buffalo Treehopper
- Cactus bug
- Carolina Wolf Spider
- Carpenter Ants
- Carpenterworm
- Carrot beetle
- Casemaking Clothes Moth
- Cherry Fruitworm
- Citronella Ants
- Click Beetles
- Cluster Fly
- Cochineal Scale
- Colorado Potato Beetle
- Common blue mud dauber
- Common Gluphisia
- Common Gray
- Common Green Bottle Fly
- Corn rootworms
- Cottonwood Leaf Beetle
- Cottony Maple Scale
- Cranberry Girdler (Subterranean Webworm)
- Cross Orbweaver
- Crucifer flea beetle
- Currant Fruit Fly
- Damsel Bugs
- Deer Fly
- Diamondback Moth
- Dragonflies
- Drain Fly (Moth Fly)
- Dried Fruit Beetle
- Eastern Carpenter Bee
- Elm Sawfly
- European Earwig
- Eyespotted Bud Moth
- False Chinch Bug
- False Widow Spiders
- Fireflies
- Flatheaded Appletree Borer
- Forest Tent Caterpillar
- Fruittree leafroller
- Gall and Bud Mites
- Garter snakes
- German Cockroach
- Giant Ichneumon Wasps
- Golden Tortoise Beetle
- Goldeneyed lacewing
- Gray Spruce Looper
- Great Golden Digger Wasp
- Green Lacewings
- Greenbug
- Ground Beetles
- Hackberry Psyllids
- Hayden grasshopper
- Honeylocust Borer
- Honeypot ants
- Horse Flies
- House Mouse
- Hover Flies (Flower Flies, Syrphid Flies)
- Hummingbird Moths
- Ichneumon wasps
- Imported currantworm
- Indianmeal Moth
- Japanese maple leafhopper
- Jocose Sallow (The Joker)
- Largeheaded grasshopper
- Leafcurl plum aphid
- Limonius wireworms
- Linden Aphid
- Linden Looper
- Long-horned bees
- Longlegged Flies
- Loosestrife flower weevil
- Loosestrife root weevil
- Mantidflies
- Meadow plant bug
- Mealy plum aphid
- Mildew-Eating Lady Beetles
- Mining Bees
- Mountain leafhopper
- Multicolored Asian Lady Beetle
- Nomad bees
- Oak Gall Wasps
- Obliquebanded Leafroller
- Odorous House Ant
- Oleander Aphid
- Oriental Cockroach
- Outdoor centipedes (stone, soil and bark centipedes)
- Pacific Flatheaded Borer
- Pandemis Leafroller (Apple Pandemis)
- Pea Aphid
- Pear Slug
- Pennsylvania dingy ground beetle
- Pine leaf adelgid
- Pine Sawflies
- Plume Moths
- Pole borer
- Polyphemus Moth
- Poplar borer
- Predaceous diving beetles
- Pseudoscorpions
- Punctured Tiger Beetle
- Pygmy grasshoppers
- Rabbits (cottontails; eastern cottontail shown)
- Raccoon
- Raspberry Crown Borer
- Red Admiral
- Red Flour Beetle
- Red Turpentine Beetle
- Red-Legged Grasshopper
- Redhumped Caterpillar
- Redlegged Ham Beetle
- Robber Flies
- Rodent and rabbit bot flies
- Rove Beetles
- Saddleback Looper
- Sap Beetles (Picnic Beetles)
- Scoliid wasps
- Scorpions
- Snails and Slugs
- Snowy Tree Cricket
- Speckle-winged grasshopper
- Spider Wasps
- Spotted-Wing Drosophila
- Spotted-winged grasshopper
- Springtail
- Spruce Bud Moth
- Spruce Needleminer
- Spruce-Fir Looper (Pale-Marked Angle)
- Squash Bees
- Stable Fly
- Striped sand grasshopper
- Sumac flea beetle
- Sunflower Receptacle Maggot
- Swallow Bug
- Tachinid Flies
- Thief Ant
- Thistle tortoise beetle
- Thread-waisted sand wasps
- Toadflax galling weevils
- Tobacco Budworm
- Tomato Hornworm
- True Armyworm
- Turnip aphid
- Twospotted Stink Bug
- Underwing Moths
- Varied Carpet Beetle
- Velvet Ants (eastern velvet ant, "cow killer")
- Velvet Longhorned Beetle
- Velvety Tree Ant
- Warehouse Beetle
- Water scorpions
- Wavy-lined Emerald
- Western bean cutworm
- Western Subterranean Termite
- Wheat stem sawfly
- Whirligig beetles
- White-crossed grasshopper
- Whitewhiskered grasshopper
- Wood Cockroaches
- Woodpeckers
- Woodrats
- Yellow Mealworm
- Yellow Woollybear
- Yellow-faced bees
- Yellownecked Caterpillar
Range named by extension sources (5)
Termites in Idaho
Subterranean termites occur throughout Idaho except the Panhandle and high mountain areas.[2]
Invasive species reported here
An Idaho State Department of Agriculture detection trap in Caldwell caught the first Japanese beetle ever found in Canyon County.[4]
Pests local experts flag
University of Idaho Extension says the hobo spider is now common statewide in Idaho.[3]
Public agencies that handle pests
The Idaho Department of Health and Welfare tracks West Nile virus surveillance findings by county and publishes annual summaries.[5]
Hiring a licensed company
Idaho's pesticide regulatory agency is the Idaho State Department of Agriculture (Agriculture Resources Division).[1]
Free local help
University of Idaho Plant Diagnostic Services diagnoses plant problems, with Idaho's NPDN hub lab at the Parma Research and Extension Center.[7]
Local guides in Idaho
Through the year
- Winter to Spring
- In Idaho, termite swarmers may be seen indoors around windows and lights in late winter or early spring.[2]
- Summer
- Adult male hobo spiders are often seen running across basement and ground-level floors from mid-July until the first killing frost.[3]
- Fall
- Idaho health officials say West Nile virus risk from mosquitoes stays elevated statewide until a killing frost in the fall.[6]
Sources
- National Pesticide Information Center, “State Pesticide Regulatory Agencies.” npic.orst.edu/reg/state_agencies.html (accessed 2026-10-06)
- University of Idaho Extension, “Subterranean Termites.” objects.lib.uidaho.edu/uiext/uiext30870.pdf (accessed 2026-10-06)
- University of Idaho Extension, “Hobo Spiders in Idaho.” www.uidaho.edu/-/media/UIdaho-Responsive/Files/Extension/publications/cis/cis1221.pdf?la=en (accessed 2026-10-06)
- Idaho State Department of Agriculture, “Idaho Japanese Beetle.” agri.idaho.gov/idaho-japanese-beetle/ (accessed 2026-10-06)
- Idaho Department of Health and Welfare, “West Nile Virus.” healthandwelfare.idaho.gov/health-wellness/diseases-conditions/west-nile-virus (accessed 2026-10-06)
- Idaho Department of Health and Welfare, “West Nile virus detected in Ada County mosquitoes.” healthandwelfare.idaho.gov/dhw-voice/west-nile-virus-detected-ada-county-mosquitoes-take-measures-protect-yourself-against (accessed 2026-10-06)
- University of Idaho, “Plant Diagnostic Services.” uidaho.edu/cals/plant-diagnostics (accessed 2026-10-06)