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Beech scale produces a dirty white waxy powder which can be obvious on beech trees. Although it is unsightly and may cause alarm it does little harm to the trees.
Beech scale (Cryptococcus fagisuga) on Beech (Fagus sylvatica)
Beech scale, also known as felted beech coccus, is a scale insect that feeds on the sap of beech (Fagus sylvatica) trees. It is found in colonies in crevices of the bark of the trunk and larger branches.
Individuals are about 1mm long but infestations are usually detected by the dirty white waxy powder that colonies produce.
There is no honeydew produced and little direct damage caused but affected trees may become more susceptible to beech bark disease.
As this insect usually causes little direct damage to trees control is not necessary. This is fortunate as it is not practical to treat the large trees that it often infects.
Beech scale is parthenogenetic (reproducing without the need for males) scale insect with one generation year.
During the summer each female lays clusters of up to eight eggs under the protective white waxy wool like substance. The eggs hatch by late summer and the nymphs settle to feed in bark crevices. They overwinter as nymphs becoming adults in early spring.
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