Hemlock (Tsuga) woolly adelgids are usually noticed when a hemlock starts to lose needles, or the cottony, white egg masses are noticed on the twigs and leaf bases. They can be treated in early spring with dormant oil to reduce overwintering adults, or spray with insecticidal soaps in June and October. We also use injection systems to inject affected trees with a small amount of systemic insecticide. That gives the tree ongoing protection and minimizes the amount of material used, since it is injected into the tree just behind the bark.
-Lauren Greenhow, General Manager, GreenHow, Inc.
www.GreenHow.com. Effective Organic & Low Impact Solutions, Lawn Care, Pest Control & Termite Control in Newton and Metro Boston.
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