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Yew scale is a sap-sucking insect that can be found on yew (Taxus) at any time of year, partly because dead scales remain attached to the plant.
Yew scale Parthenolecanium pomericanum on Yew Taxus baccata
There are many types of scale insects encountered by gardeners. Yew scale is a sap-sucking insect that lives mainly on the leaves and stems of a yew (Taxus). It is similar in appearance to brown scale however, brown scale is found on a wide range of plants but not Taxus.
Yew scale has one generation a year and in early summer the adult insects can be seen on the leaves and stems. The eggs hatch in late June and July and the young scale nymphs then disperse and feed during the summer by sucking sap from the leaves.
Light infestations are of little consequence and can be tolerated. Yew scale is a food source for some ladybirds and other predators which can keep it under control.
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