Invasive Adelgids in North American Conifers
Authored By: S. Cook, K. Humes, R. Hruska, C. Williams, G. Fraley
Adelgids (Homoptera: Adelgidae) are small insects with piercing and sucking mouthparts. They have a white woolly covering that is secreted over the body. There are several native adelgid species within North America such as the Cooley spruce gall adelgid (Adelges cooleyi), and some of these can cause growth loss or reach economic injury levels under some conditions. However, the two adelgid species that are currently causing the most economic and ecological impacts within North America are the introduced balsam woolly adelgid (A. piceae) and the hemlock woolly adelgid (A. tsugae), both of which are established in both the Eastern and Western United States.
Subsections found in Invasive Adelgids in North American Conifers
- Balsam Woolly Adelgid: Hosts and Biology : Balsam woolly adelgid is native to the fir forests of central Europe and was introduced into the United States around 1900.
- Hemlock Woolly Adelgid: Hosts and Biology : Hemlock woolly adelgid is native to Asia and was first reported in the Pacific Northwest in the 1920s.
Encyclopedia ID: p3301
