Eulecanium cerasorum
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Author(s): Raymond Gill, California Department of Food and Agriculture
Source: IPM Images
Eulecanium cerasorum (Cockerell, 1900) - (calico scale)
This soft scale is found in eastern Asia and North America. It is believed to have been introduced into California in the 1920s from Asia. It infests various species of deciduous trees like Acer, Aesculus or Celtis species. Also fruit trees may be attacked.
The scale can become a serious pest and specially young trees are vulnerable. Heavy infestations reduced tree vigor and may result in premature leaf drop and branch dieback. The excessive production of honeydew in spring can be a problem in urban areas when it coats vehicles.
E. cerasorum has one generation per year. In North America, reproduction is by parthenogenesis with the 2nd instars overwintering on the bark of the host tree. The adult female is hemispherical, around 7-8 mm in diameter with a dark brown or black colour and 4 rows of yellow or white marks.
