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Euonymus scale

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.

Find it on: euonymus
Time to act: mid-July, early September, winter

Overview

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.


Solution

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

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.




Discuss this problem

Talkback: Euonymus scale
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ILOVEBEES 24/11/2011 at 15:29

Before using thiacloprid, imidacloprid, acetamocloprid or any other neonicotinoid pesticide, I recommed visiting the Buglife website, to read their report summarising independent research on neonicotinoids. They kill bees & other non-target insects - eg. butterflies etc. Miniscule amounts impair the ability of insect to function resulting inevitably in death. Also, seek out the fact sheets from the US environment agency -you may get a shock! We used to manage without them & can now.