The Hemlock whistles softly to itself.”–Naturalist and botanist Donald Culross Peattite Known as the state tree of Pennsylvania, the backbone of the nineteenth century hide-tanning industry, and a ...
osakensis) and silver flies (Leucotaraxis argenticollis and L. piniperda). The species are native to the Pacific Northwest and Japan, where hemlock wooly adelgid is a common pest of local hemlocks.
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Hemlock woolly adelgid (HWA ... These species are native to the Pacific Northwest and Japan, where HWA is a common pest of local hemlocks. Laricobius beetles are released as adults in the fall ...