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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