Hemlock woolly adelgid
Adelges tsugae
Invasive summary
A sap-feeding insect that infests hemlock trees and is recognizable by white woolly egg sacs.
Known impacts
Causes hemlock decline and mortality, affecting stream shade, wildlife habitat, and forest structure.
Management notes
Management includes surveys, biological control, systemic insecticides, and limiting movement of infested nursery stock.
Native range
East Asia
Regions where reported
- CA - 40 public points
- US - 40 public points