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Carpenter Costin Blog

Treat Your Hemlocks Before It's Too Late

Hemlock Wooly Adelgid and Elongate Hemlock Scale infestations are on the rise, treat these pests now while you still can!

Prevent or manage pests on your beautiful hemlocks before it is too late. Late spring and early summer treatments of horticultural oil can help protect your hemlocks from Hemlock Wooly Adelgid (HWA) until the fall. Systemic imidacloprid is also an effective treatment when injected in the soil or trunk; however, it may take longer than a topical treatment of horticultural oil.

Elongate Hemlock Scale (EHS), or Fiorinia Scale, is becoming more popular in our region, especially on trees already infected by Hemlock Wooly Adelgid. Unfortunately, HWA treatment tactics are not effective for Elongate Scale prevention and management. One effective treatment for EHS is Dinotefuran, which is similar to imidaclopird, but it effectively treats hemlocks infested with EHS.

The Eastern Hemlock is one of the most popular and beloved trees in the North East. Ensuring their health is vital to the appeal and life of your landscape. To learn more about Hemlock Wooly Adelgid or Elongate Hemlock Scale treatments, consult with a Certified Arborist.

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