Have you seen European elm scale?
Dr. Mike Merchant, a researcher in College Station is looking for wild populations of European elm scale https://bugguide.net/node/view/122456 (part of research on crape myrtle bark scale biocontrol). Specific host preference among the elms is uncertain at this time, but there is a National Elm Trials where they are looking for resistance in elms. https://en.wikipedia.org/wiki/National_Elm_Trial American elm populations have been hit by the beetle and Dutch elm disease.
If anyone thinks they may have spotted the European elm scale can contact Mike Merchant at Michael.Merchant@ag.tamu.edu
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