Lepidosaphes ulmi

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Lepidosaphes ulmi on mistletoe (click on image to enlarge it)
Source: United States National Collection of Scale Insects Photographs Archive, USDA Agricultural Research Service - IPM Images

Lepidosaphes ulmi (Linnaeus, 1758) - (apple mussel scale)

This scale insect is widely distributed in temperate regions and is highly polyphagous. It infests many fruit and forest trees or ornamentals. For example, the hosts include fruit trees like apple, olive, plum, apricot or walnut and forest trees like oak, poplar/aspen or willow. It colonizes trunks, branches or stems of the host plant. Heavy infestations can result in stunting, chlorosis, bark cracking and dieback of the host tree, and even include tree death (Crouch et al., 2021).

The adult female scale has an elongated shell, around 4 mm long. In some colonies, males are absent. There is one generation per year, with eggs being produced in autumn which overwinter under the shell of the mother scale and hatch in spring. The mother scale dies at the end of the season.

Vernacular names
• Deutsch: Gemeine Kommaschildlaus
• English: apple mussel scale
oystershell scale
• Español: serpeta del olmo
• Français: cochenille virgule du pommier
• Português: cochonilha-escama-marisco

For more details see the respective page in the BugwoodWiki.