Eulecanium excrescens (Ferris, 1920)
polyphagous on woody plants
mature female © United States National Collection of Scale Insects Photographs, USDA Agricultural Research Service, Bugwood.org
late instar larva
Adult females are globular, dark brown, generally covered by a greyish powdery wax they makes them look mouldy. Their unusual size (10 x 13 mm), distinguishes them on their most popular host, Wisteria, from Eulecanium tiliae and Parthenolecanium corni, the other two scales that regularly occur on that plant. Late instar larvae and adult females live on the branches, but younger larvae live on the leaves. Males seemingly are absent.
Strong preference for Wisteria.
Univoltine; hibernation als larva on the branches.
distribution within Europe
Chinese species, known from the UK since the latest turn of the century.
Malumphy (2005a), Salisbury, Halstead & Malumphy (2010a).