Adults and larvae are both small, about 0.10 inch long. Many species of frut trees are susceptible to attack, including cherry, peach, plum, apple, and pear. They are a secondary pest and generally attack weakened trees, or trees already under attack by other insects or disease. If the population gets high enough in a general area, healthy trees can be attacked.
The following links provide helpful information, images, and updates on fruit pest and disease control for both commercial orchardists and homeowners.
Insect and Disease Information
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IPM Advisory - Tree Fruit
IPM Advisory - Small Fruit and Vegetable
Commercial Tree Fruit Production Guide
Home Orchard Pest Management Guide
Utah TRAPs, a degree day calculator from the Utah Climate Center