Chionaspis salicis

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Chionaspis salicis on Sorbus aucuparia (click on image to enlarge it)
Author(s): Hannes Lemme
Source: IPM Images

Chionaspis salicis (Linnaeus, 1758) - (willow armored scale)

This scale insect is found in temperate parts of the northern hemisphere. It is polyphagous, attacking mainly deciduous forest trees like Salix, Populus, Betula, Alnus or Fraxinus. The scales colonise the bark of stems and branches. Heavy infestations lead to growth reduction of the trees.

Reproduction can be sexual or parthenogenetic. The scale cover can reach 3 mm in females with the insect being yellowish to reddish brown.

Vernacular names
• Deutsch: Weidenschildlaus
• English: willow armored scale
black willow scale
• Français: cochenille du saule