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Hemlock Wooly Adelgid

It attacks both the Carolina and Eastern hemlock and is capable of severely weakening and killing its host plants. Healthier plants, prior to infestation, may endure longer, but previously stressed plants may die in 3-5 years. The key to its management is to recognize it early and implement the proper management strategies. This insect is atypical of most insect species in the Northeast in that it is inactive for much of the growing season and very active throughout the winter. The most noticeable stage of the pest and have the appearance of small, white cotton balls lined up at the base of the needles. The HWA, in the landscape and nursery, is very manageable if the problem is addressed early and aggressively. One option that poses reduced risk to non-target insects is the use of horticultural oils. These can be applied as either a dormant oil spray and/or as a summer spray.