Common Insect Problems on Trees
- Aphids - Common insect problem for most trees and shrubs
- Cooley Spruce Gall - found on Spruce branch ends
- Woolly Apple Aphids - Apple, Crabapple, Mountain-Ash
- Petiolegall Aphid - Cottonwoods and Poplars; marble-like growth on leaf stalk
- Mountain Pine Beetle - Kills Pines: Ponderosa, Scotch, Lodgepole, Limber, Piñon, and Austrian.
- Spruce Ips Bark Beetle - Causes die-back and death in Spruce trees
- Cottonwood Leaf Beetle- Cottonwood, Poplar, Aspen
- Poplar Blackmine Beetle - Cottonwood leaves, showing large black patches on the leaves
- Banded Elm Bark Beetle - Siberian Elms
- Elm Leaf Beetle - Elms
- Tussock Moth- Willows
- Douglas-fir Tussock Moth - Spruce trees and Douglas-fir trees
- Lilac/Ash Borer - Ash trees
- Pear slug - Hawthorn trees, Cotoneaster bushes
- Spiny Elm Caterpillar - Elms, and Hackberry trees
- Honeylocust Plant Bug - Honeylocust trees
- Oystershell Scale - Aspen, Cottonwood, and Ash trees, and Cotoneaster shrubs
- Cottony Maple Scale - Honeylocust, Silver Maples
- Black Vine Weevil - Lilacs
- Leafcutter Bee - Roses and many other plants with larger leaves
- Two-tailed Swallowtail - Ash and Chokecherry trees
Much of the information gathered was provided by the following sources:
Colorado State University Cooperative Extension
UW- Cooperative Extension Service
Barnyards and Backyards - Rural Living
"Landscape Pests" - University of Wyoming Cooperative Extension Service publication B-1035 is particularly helpful for tree care. This online publication contains information on: Aphids, Borers, Cottonwood blotch leaf miners, Cytospora canker, Fireblight, Gall makers, Aspen leaf spots, Oystershell scale, Pear slugs, Powdery mildew, and Spider mites.
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