University of Illinois Extension

University of Illinois Extension

Hort Answers

Insect Damage

Dogwood Borer
Synanthedon scitula

Dogwood borer adult. P. Nixon.
Dogwood borer adult. P. Nixon.
3 (1 = rare 5 = annual)
5 (1 = very little damage 5 = plants killed)
This borer not only attacks dogwood trees but also plants in the genera Prunus, Malus and other plant genera.

Plants Affected
Dogwood borer adults are clearwing moths that look like a wasp. The larvae feed on the phloem tissue. As the larvae grow larger the eventually begin to feed on the sapwood.

Life Cycle
Adults can be present from July to September. The adult female borer lays its eggs on the bark and dies soon after. The larvae eat their way into the bark. The eggs are laid near injuries including pruning wounds.

Avoid pruning during summer months.

Related Resources
Home, Yard & Garden Pest Guide
Illinois Commercial Landscape and Turfgrass Pest Management Handbook
U of IL - Distance Diagnosis through Digital Imaging
U of IL - Plant Clinic