What is this gray infestation on my pachysandra?

Asked September 29, 2015, 9:16 PM EDT

I have large areas of well-established pachysandra ground cover in my yard. This summer I have found the stems to be heavily infested with a spindle-shaped, hard, gray infestation that flicks off if I pry with my fingernail. I think this may be an armored scale and am wondering how to treat it.

Dakota County Minnesota pachysandra scale on pachysandra lrk scale

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