Flat oval brown/grey with white margin larva on elm in NH
Location: Concord, NH
May 29, 2011 1:19 am
Just discovered several 6 to 8 millimeter flat oval larva in clusters on young Elm tree in Concord, NH. We believe ants have been farming aphids on this tree in the past and we expect they are at it again. When I scraped the clusters they are soft and become an orange-red ink like (blood colored?) mass. They seem to have collected at regions where the bark is splitting as the tree grows and at sites of pruning last fall. One photo shows how they appear to have a fuzzy white margin.
Signature: Planting Trees for Shade.
Of the European Elm Scale, Gossyparia spuria, BugGuide indicates: “Sap-sucking can cause stunted, chlorotic foliage, premature leaf drop and branch dieback. Associated black sooty mold growth from honeydew secretions on tops of branches gives trees an overall black appearance. Honeydew secretions are also a common nuisance to cars parked under infested elms.
Introduced from Europe.” It seems the European Elm Scale is an Invasive Exotic species.