Hemlock Wooly Adelgid

The Hemlock Wooly Aldelgid (HWA)

• • This is a small, invasive insect that poses a serious threat to hemlock trees.

  • They feed on the sap of hemlock trees, which weakens and eventually kills them.

  • They are easily identifiable by the white, cottony masses they produce, which look like tiny woolly balls, particularly on the underside of hemlock branches.

  • It is an invasive species that has caused widespread hemlock tree death in eastern North America.

  • It is important to be "diligent" in watching for this pest, and in not transporting firewood, to prevent its spread.

Essentially, the "woolly" part of the name refers to the white, wool-like egg sacs the insect produces, and the "adelgid" part is the type of insect it is.

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Instructions for applying the systemic insecticide Imidaclopred WSP (water soluble packet) and Imidaclopred 2F liquid.

Imidacloprid 2F is no longer shipped to New York from Amazon, but could possibly be purchased elsewhere. Imidacloprid WSP (water-soluble packet) is available from Amazon. Wayne Hartley had a test shipment sent to him, and it arrived okay.  The NY DEC approves both products for property owners to apply as a soil drench only. No other uses are allowed except by licensed applicators. The WPS version is also very inexpensive to use.  This version is packed with four water-soluble packets.  Each water-soluble packet will treat 48 inches of total tree diameter. You are allowed to use five and one-third water-soluble packets per year, per acre.  These are powerful chemicals; if used improperly could harm our lake.  Please adhere to the instructions.  For imidacloprid 2F you are allowed 30 ounces of concentrate per acre per year.

 Amazon link for ordering.  Primesource Imidacloprid 75WSP Select:, 84507PS4416 https://a.co/d/gn8tTkk  $36.54 per four-pack. Items you also may want to order at the same time would be at least one 48oz wide-mouth Nalgene bottle with graduations, and a diameter tape.

Following is a link to the New York website HWA Management for Land Owners.  https://blogs.cornell.edu/nyshemlockinitiative/hwa-management/hwa-management-for-land  The instructions below were linked from this website.