Help us achieve our goals:
make a donation »
Join the RHS today and support our charity
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Make a donation
I have forgotten my password
Keep me signed in
Register for free to receive our newsletters, add comments to blogs/articles and to save content.
See what events are on near you and browse your bookmarked pages.
Viburnum scale affects Viburnum tinus and ivy (Hedera), often causing a heavy coating of honeydew and sooty mould.
Viburnum scale is a sap sucking true bug. It is 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)
Beech scale Brown scale Cushion scale Diaspid scaleEuonymus scale Fluted scale Hemispherical scale Horse chestnut scale Hydrangea scale Juniper scale Mussel scale Oleander scale RHS statement on pesticides in horticulture Rose scurfy scale Scale insects Soft scale Sooty moulds Viburnum beetleWisteria scaleYew scale
the RHS today and get 12 months for the price of 9
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
Register for the site or sign in to share your experiences on this topic and seek advice from our community of gardeners.
We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.
Join the RHS today and get 12 months for the price of 9