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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.
|• Deutsch:||Gemeine Kommaschildlaus|
|• English:||apple mussel scale
|• Español:||serpeta del olmo|
|• Français:||cochenille virgule du pommier|
For more details see the respective page in the BugwoodWiki.