Common Denver Tree Species

Species	Common Insects or Disease
Ash	Aphids, Ash Borer, Red headed Ash Borer, Oyster Shell Scale and Ash Sawfly
Apple & Crab Apple	Aphids, Mites, Fireblight, Powdery Mildew and Codling Moth
Aspen, Cottonwood & Poplar	Aphids, Leaf Spot, Cytospora Canker, Cottonwood/Poplar Borer
Birch	Aphids and Bronze Birch Borer
Elm	Aphids, Mites, Elm Leaf Beetle, Elm Scale, Elm Leaf Miner, Dutch Elm Disease, Elm Bark Beetle
Hawthorn	Aphids, Mites, Leaf Miner and Mealy Bug
Linden	Aphids and Mites
Locust	Mites, Leaf Hopper, and Thyronectria Canker
Maple	Aphids, Cottony Maple Scale and Anthracnose
Pear	Fireblight *Some species are more susceptible to fireblight than others.
Peach and Plum	Aphids and Crown Borer
Juniper	Aphids, Mites and Needle Scale
Pines	Aphids, Mites, IPS Engraver Beetle, Pine needle scale, Zimmerman Pine Moth, Striped Pine Scale, Pine Bark Adelgid, Mountain Pine Beetle, Turpentine Beetle, Aphids and Mites
Oaks	Aphids, Mites, Kermes Scale and Oak Borer
Spruce	Aphids, Mites, IPS Engraver Beetle, Tussock Moth, Aphid Gall, Mites and Cytospora Canker
Walnut	Aphids, Walnut Twig Beetle and 1000 Canker Disease
Willow	Aphids, Cytospora Canker and Aphids