Since 1925 the lecanium scale Eulecanium coryli (L) has been one of the most destructive insects in the coast region of British Columbia. It was introduced accidentally from Europe about 1913. A great variety of hosts are attacked, the chief of these, in order of preference, being: alder, horse-chest-nut, maples of several species, hawthorn, mountain ash, laurel, elm and garden roses; a few scales are often to be found on species of Rubus, Populus, Betula and Salix.