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Anthracnose

Aphids

Apple/Crabapple

Apple Scab

Arborvitae

Ash Bark Beetles

Ash Flower Gall Mite

Ash Plant Bug

Aspen Blotch Leafminer

Bacterial Blight of Lilac

Bacterial Wetwood or Slime-flux

Birch

Black Canker of Willow

Black Knot

Blister Mites

Boxelder

Bronze Birch Borer

Buckeye and Horsechestnut

Bur Oak

Callery Pear/Bradford Pear

Cedar-Apple Rust

Cedar-Hawthorn Rust

Codling Moth

Colorado Blue Spruce

Cooley Spruce Gall Adelgid

Cotoneaster/Hedge Cotoneaster

Cottony Maple Scale

Crown Gall

Cytospora Canker

Deep Planting/Grade Change

Deer

Diplodia Tip Blight

Dothistroma Needle Blight

Douglas-Fir

Douglas-Fir Tussock Moth

Drought Stress

Dutch Elm Disease

Elm

Engraver Beetles

Eriophyid Mites

European Elm Scale

European Mountain Ash

Fasciation

Fir

Fire Blight

Forest Tent Caterpillars

Frost Crack

Giant Conifer Aphid

Grape

Green Ash

Hackberry

Hawthorn

Herbicide Injury–Glyphosate

Herbicide Injury–Synthetic Auxins

Juniper

Kabatina Tip Blight

Leaf Chlorosis

Leafcurl Ash Aphid

Leafhoppers

Leaf Scorch

Lilac

Linden

Maple

Marssonina Leaf Spot

Mountain Pine Beetle

Nectria Canker

Oak Leaf Blister

Oystershell Scale

Pear Sawfly or Pearslug

Phomopsis Tip Blight

Pine

Pine Needle Scale

Poplar Borer

Powdery Mildew

Quaking Aspen/Poplar/Cottonwood

Rhabdocline Needle Cast

Rhizosphaera Needle Cast

Root Weevils

Rough Bulletgall Wasp

Seasonal Needle Drop

Shot Hole Blight or Coryneum Blight

Sour Cherry/Pie Cherry/Tart Cherry

Spruce Bud Scale

Spruce Spider Mite

Stigmina Needle Cast

Sudden Needle Drop

Swiss Needle Cast

Thornless Honeylocust

Transplant Shock

Two-Spotted Spider Mite

Venturia Leaf and Shoot Blight

Virginia Creeper

Voles

Western Gall Rust

Western Spruce Budworm

White Pine Weevil

White Willow/Golden Willow

Willow Redgall Sawfly

Woodpeckers and Sapsuckers