Idaho

111 active alerts in this region

TreeIssues monitors plant and tree health threats across Idaho. Below you will find current alerts for pests, diseases, fungi, and invasive species that have been detected in the state. Alerts are sourced from USDA, USFS, and Idaho state agricultural agencies. Each alert includes severity ratings, affected species, symptoms, and recommended treatments.

Mountain Pine Beetle

CRITICAL

Insect

A native bark beetle responsible for massive die-offs of lodgepole, ponderosa, and whitebark pines across western North America. Climate change has expanded its range northward and to higher elevations. Outbreaks have affected tens of millions of acres.

Affecting 9 regions

Dutch Elm Disease

CRITICAL

Disease

A devastating vascular wilt disease spread by elm bark beetles that has killed millions of American elms since the 1930s. The fungus blocks water-conducting vessels, causing rapid wilting. It fundamentally changed the American urban landscape.

Affecting 45 regions

Fire Blight

HIGH

Disease

A bacterial disease that primarily affects members of the rose family, including apple and pear trees. It can destroy entire orchards in a single season. Bacteria spread rapidly during warm, wet spring weather through blossoms and wounds.

Affecting 32 regions

Thousand Cankers Disease

HIGH

Disease

A disease complex involving the walnut twig beetle and an associated fungus that has caused significant mortality of black walnut, particularly in western states. Thousands of small cankers coalesce to girdle branches and the trunk.

Affecting 15 regions

Armillaria Root Rot

HIGH

Fungus

One of the most widespread and destructive forest diseases in the world, caused by a complex of honey mushroom species. It attacks stressed trees through root contact and can persist in dead stumps for decades, infecting nearby healthy trees.

Affecting 36 regions

Bronze Birch Borer

HIGH

Insect

A native North American wood-boring beetle that attacks birch trees, especially paper birch and European white birch in landscape settings. Larvae feed under the bark in a serpentine pattern, disrupting nutrient and water transport. Dieback starts at the top of the crown and progresses downward, the opposite pattern of many other pests.

Affecting 26 regions

Idaho

Mountain Pine Beetle

Dutch Elm Disease

Fire Blight

Thousand Cankers Disease

Armillaria Root Rot

Bronze Birch Borer

Ips Bark Beetles

Dothistroma Needle Blight

Convergent Lady Beetle

European Firebug

Asian Longhorned Beetle Damages hardwood trees by tunneling deep into trunks and branches

California Tortoiseshell

North American Common Water Strider

Two-spotted Lady Beetle

Red-femured Milkweed Borer

Cobalt Milkweed Beetle

witch's butter

Fib King

Megaloceroea recticornis

Spotted Tussock Moth

Sagebrush Goldspeck Lichen

Small-eyed Sphinx

Seven-spotted Lady Beetle

Clover root weevil

Rhynocoris ventralis

Western Boxelder Bug

Hairy Oyster Mushroom

Alfalfa Plant Bug

Rosy Larch Bolete

Red Admiral

Wild Cherry Sphinx

Drowsy-eyed Sphinx

False Funeral Bell

Western Tiger Swallowtail

Mourning Cloak

Mountain Butter Bolete

blue knight

Northern Cinnabar Polypore

Knapweed Root Moth

black knot

Xestoleptura crassipes

Thirteen-spotted Lady Beetle

Tuckerman's Coral Lichen

Bronzed Tiger Beetle

Casey's Lady Beetle

Meadow Plant Bug

Smith's Bolete

admirable bolete

Indian paint fungus

Blue-staining Slippery Jack

liverwort navel

Brown Marmorated Stink Bug

Barrow's Bolete

wolf lichen

Asian Lady Beetle

White-spotted Sawyer

western bitter bolete

Caloboletus frustosus

Giant Water Scavenger Beetle

Nine-spotted Lady Beetle

violet webcap

Waved Sphinx

Bronze Ground Beetle

Small Milkweed Bug

Milky Backswimmers

Treble Bar

Western Conifer Seed Bug

Spruce Coneworm Moth

Hemlock Looper Moth

Lorquin's Admiral

White-lined Sphinx

Eastern Boxelder Bug

Spotted Pine Sawyer

lobster mushroom

Locust Borer

Lilac Root Weevil

turkey-tail

Raucous Broad-nosed Weevil

Sawadaea tulasnei