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Viburnum scale affects Viburnum tinus and ivy (Hedera), often causing a heavy coating of honeydew and sooty mould.
Viburnum scale (Lichtensia viburni) on Viburnum tinus
There are many types of scale insects encountered by gardeners, they are sap sucking true bugs.
Viburnum scale is ais only found on the foliage of Viburnum tinus and ivy (Hedera).
Adult females are flat, oval, pale yellow and up to 4mm long. Males are 2.5mm long white and elongate oval. In May-June the females become covered with a white fluffy wax coating amongst which the eggs are laid. The crawlers hatch from the eggs in late June.
Apart from the presence of the insects and the white fluffy eggs masses (in spring) the main symptom is the presence of honeydew on which sooty mould often grows.
Symptoms are superficially similar to cushion scale, however that species rarely occurs on viburnum or ivy.
Viburnum scale insects can be difficult to control, replacing severely infested plants should be considered.
Well-tended healthy plants are able to tolerate infestations, although the growth of sooty mould can be unsightly. Physically squashing or removing scales may control light infestations.
The waxy covering produced by scales gives them some protection from insecticides and the best results are achieved by spraying against the newly hatched crawlers in June or early July.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
Chemical labels explained
Chemicals: using a sprayer
Chemicals: using safely and effectively
Horse chestnut scale
RHS statement on pesticides in horticulture
Rose scurfy scale
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