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Hemlock Woolly Adelgid on Fir: Systemic Treatment

Vancouver Island fir (Abies amabilis) shows white woolly masses on branches—dark, squishy inside when crushed.

Identification

Hemlock Woolly Adelgid (Adelges tsugae). Affects hemlocks and firs. White wax covers feeding nymphs.

Effective Treatment

Bayer Advanced Tree & Shrub Insect Control (imidacloprid)
Soil application around tree
Roots translocate to foliage/twigs
Adelgids killed on feeding
Season-long protection
Available at garden/nursery stores

Host Specificity

Adelgids only infest hemlock/fir—no risk to other garden plants.

Additional Resource

USFS Hemlock Woolly Adelgid Guide

Conifers: Elm Tree with Peeling Bark and Defoliation: Insect Feeding Likely; Deodar Cedar Decline: Water, pH, and Pest Investigation; Pussywillow Base Rot: Overwatering and Atomic Grow; Willow/Poplar Weevil Late Season: Identification First, Treatment Next Spring; Scale Insects on Ficus: Systemic Soil Drench Treatment; Tiny Flying Bugs on Maple: Harmless or Harmful?; Bugs on Florida Tree Trunk: Likely Love Bugs or Similar, Not Harmful; Fir Tree Infestation: Aphids/Scale, Sooty Mold, and Systemic Treatment; Saving a Fir with a Dead Top; Douglas Fir Co-dominant Leader Decision

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