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Brown scale is a sap-sucking insect that evidence of which can be found on woody plants at any time of year, partly because old dead scales remain attached to the bark.
Brown scale on cotoneaster. Credit: RHS/Science.
There are many types of scale insects encountered by gardeners, they are sap sucking true bugs. Brown scale lives primarily on stems and is found on a wide range of woody plants.
Light infestations are of little consequence and can be tolerated, but heavy attacks are best dealt with in early to mid-summer when the more vulnerable newly-hatched scales are present.
Adult scale can be removed when seen but this may not reduce heavy infestations.
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Horse chestnut scale
Woolly vine or currant scale
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