Euonymus scale

Time to act:

Dec, Jan, Feb, Jul, Sep

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, dieback and loss of vigour.

Symptoms

Heavy infestations of scale insects discolour the evergreen leaves of euonymus and leave yellow areas, which can lead to dieback 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.

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