Eulecanium excrescens (Ferris, 1920)

wisteria scale

polyphagous on woody plants

Eulecanium excrescens: mature female

mature female © United States National Collection of Scale Insects Photographs, USDA Agricultural Research Service, Bugwood.org

Eulecanium excrescens: late larva

late instar larva

parasite

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.

host plants

Ceanothus; Parthenocissus quinquefolia, tricuspidata; Podranea ricasoliana; Prunus; Wisteria sinensis; Zelkova serrata.

Strong preference for Wisteria.

phenology

Univoltine; hibernation als larva on the branches.

distribution within Europe

(PESI, 2019).

notes

Chinese species, known from the UK since the latest turn of the century.

references

Malumphy (2005a), Salisbury, Halstead & Malumphy (2010a).

mod 6.iii.2019