Elongate Hemlock Scale

An Unusual Insect-Killing Fungus

I received an e-mail message this past Wednesday from Tom Macy (ODNR) concerning efforts to discover locations of the non-native elongate hemlock scale in Ohio and other states. His message included two attached images taken by Bill Laubscher (Pennsylvania Bureau of Forestry) on November 20 that showed both the scale as well as odd looking blackened accretions on hemlock needles.
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Joe Boggs
Elongate Hemlock Scale boggs.47 Fri, 07/15/2016 - 16:07

The non-native Elongate Hemlock Scale (Fiorinia externa), which is sometimes called "Fiornia scale," occurs on the underside of needles and on cones.  It may infest its namesake host as well as on other conifers including firs, Douglas-fir, spruces, cedars, pines, and yews.  The scale was accidently introduced to the U.S. from Japan and was first found in New York, NY, in 1908.  Currently, it's found in much of the native range for eastern hemlock (Tsuga canadensis) and Carolina hemlock (T. caroliniana).  Where it overlaps with the non-native Hemlock Woolly...

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Joe Boggs