Utah State University Extension
Most insects are bene cial; however, a few can cause serious injury to plants if left unchecked. Insects feed on or damage plants in three basic ways: 1) Chewing on the leaves, which reduces the plant’s ability to produce energy; 2) Piercing/sucking on the internal uids of the plants, which reduces plant vigor; and 3) Boring, which disrupts water and nutrient ow.
Goodspeed, Jerry, "Top Ten Insect Pests of Woody Ornamentals" (2010). All Current Publications. Paper 1082.