Euonymus Scale

Euonymus scale

We provide advice on how to tackle sap-sucking euonymus scale insects.

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Time to act
Time to act

Do Time to act in January

Do Time to act in February

Do not Time to act in March

Do not Time to act in April

Do not Time to act in May

Do not Time to act in June

Do Time to act in July

Do not Time to act in August

Do Time to act in September

Do not Time to act in October

Do not Time to act in November

Do Time to act in December

The sap-feeding scale insect Unaspis euonymi is particularly attracted to Euonymus japonica, although it will feast on other evergreen euonymus too. The white males congregate on the leaves, but the brownish-black females live on the bark, making them hard to spot. Large numbers cause yellowing of the leaves, die-back and loss of vigour.

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The sap-feeding scale insect Unaspis euonymi is particularly attracted to Euonymus japonica.

Symptoms

Heavy infestations of scale insects discolour the evergreen leaves of euonymus and leave yellow areas, which can lead to die-back and loss of vigour.

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Organic

With light infestations, scrape off the scales by hand and dispose of them. For heavy infestations, prune out those branches that are badly affected. Spray with a plant oil wash in winter.