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.
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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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.