Chemical labels explained
The labels on garden chemicals provide important information on when, where and how to use that product. Our handy guide helps you decipher this information so you can be sure to use them as safely as possible.
Quick facts
Common name - Viburnum scale
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Scientific name - Lichtensia viburni
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Plants affected - Viburnum tinus and ivy (Hedera)
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Main symptom - Honeydew and sooty mould
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Most active - Spring and summer
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What is viburnum scale?
Scale insects are sucking true bugs belonging to several families in the Hemiptera. Typically the adults are immobile having a flattened or raised appearance, with no visible legs. They often look like a 鈥榮cale鈥� on a leaf or stem, many species produce a white wax often covering egg masses. There are more than 100 species found in Britain, 26 of which have been introduced. More than 25 species can be found in gardens or on houseplants.
Viburnum scale is 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 2.5 mm 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.
Symptoms
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.
Management
- Where possible tolerate populations of scale insects. Well-tended healthy plants are able to tolerate light populations, although the growth of sooty mould can be unsightly
- Encourage predators in the garden, some ladybirds , parasitoid wasps and some birds will eat scale insects
- Adult scales and egg masses can be removed when seen but this may not reduce large populations
- Consider replacing plants with very large populations
See also
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Category: Advice -
Category: AdviceBeech scale
Beech scale produces a grey-white waxy powder which can be obvious on beech trees. This does little harm to the trees. -
Category: AdviceBrown scale
Brown scale is a sap-sucking insect, evidence of which can be found on woody plants at any time of year, partly because dead scales remain attached to the bark. -
Category: AdviceCushion scale
Heavy cushion scale populations can result in the foliage of camellia, holly, rhododendron, Trachelospermum and some other evergreen plants being covered in sooty mould during the early months of the year. -
Category: AdviceEuonymus scale
Euonymus scale has become widespread in England and can cause severe dieback on evergreen Euonymus species. -
Category: AdviceFluted scale
Once an uncommon glasshouse insect in Britain, fluted scale now occurs on outdoor plants in sheltered places. -
Category: AdviceHemispherical scale
Small brown sap sucking hemispherical scale insects can encrust the leaves and stems of a wide range of glasshouse plants. -
Category: AdviceHorse chestnut scale
Horse chestnut scale became established in London in the 1960s and has since spread throughout England and into Wales. The white egg masses are often noticed on the trunks and branches of trees and shrubs but it causes no serious damage. -
Category: AdviceHydrangea scale
Hydrangea scale became established in Britain during the 1980s and has since become widespread in English gardens, it is also found in parts of Scotland and Wales. -
Category: AdviceJuniper scale
Small sap sucking juniper scale insects can encrust junipers (Juniperus species) and some other conifers such as cypresses (Cupressus and Chamaecyparis), Leyland cypress (x Cuprocyparis leylandii) and Thuja. -
Category: AdviceMussel scale
Mussel scale is a sap feeding insect that can be found on the bark of its host plants all year round. -
Category: AdviceOleander scale
The small whitish oleander scale can affect a variety glasshouse plants, including oleander, dracaena, palms and ornamental asparagus. -
Category: AdviceOrchid and other diaspid scale insects
Small sap sucking diaspid scale insects can encrust the leaves and stems of glasshouse orchids and some other glasshouse plants. -
Category: AdviceScale insects
Adult scale insects are usually covered in waxy shell-like cover. There are more than 25 species of scale insect found in British Gardens. Each species has a different host range and life cycle. They feed by sucking sap and some can weaken host plants, many excrete a sticky substance (honeydew), which allows the growth of sooty moulds. -
Category: AdviceScurfy rose scale
Small white sap sucking scurfy rose scale insects can encrust rose (Rosa) and occasionally blackberry (Rubus fruticosus) stems. -
Category: AdviceSoft scale
Soft scale insect is very widespread and common. It is flat, oval pale yellow/brown and feeds on a wide variety of garden and glasshouse plants. It produces large amounts of honeydew. -
Category: AdviceSooty moulds
The presence of sooty mould fungi usually indicates that a plant has become affected by a sap-sucking insect. Sooty moulds do not attack the plant directly, but their growth is unsightly and can reduce plant vigour by preventing photosynthesis. -
Category: AdviceViburnum beetle
Viburnum beetle can cause defoliation of some Viburnum species, especially V. tinus and V. opulus. -
Category: AdviceWisteria scale
Wisteria scale is a sap sucking insect that was first found in Britain in a London garden in 2001. Since then it has spread but remains mainly confined to London and the surrounding areas. -
Category: AdviceYew scale
Yew scale is a sap-sucking insect that can be found on yew (Taxus) light populations of this insect are part of the natural biodiversity that this plant can support.