So what does euonymus scale look like? The larger female scales are about 2 mm long, brown, and shaped like an oyster shell. Euonymus grows vigorously, so pruning moderately in winter won’t hurt it terribly. I have a row of golden euonymus shrubs that have developed scale on the leaves and a few of the short stems. Euonymus scale bugs go through a few stages of life, during most of which they’re too small to spot easily. If you see an orange smear, the scales are still alive and need to be dealt with. Identify ‘crawlers’. Can you diagnose? Rubbing alcohol dissolves the scale insects' shells which kills them. Sign up for our newsletter. Heavily infested branches should be removed. Read the label of your oil to see if it will be effective on mature scales. A more organic form of treatment is the introduction of lady beetles, natural predators of euonymus scale, as well as pruning of heavily infested branches. A population of scale on euonymus shrubs can go through to 2 to 3 generations in a single summer. The bugs themselves are most visible in their late life scale stage, when they settle in on a single spot on the plant and grow a hard protective shell (a scale) over their backs. If I cut the back the foliage drastically now, will this harm the shrubs? During this time, you can spray with an insecticide or horticultural oil. During this time, you can spray with an insecticide or horticultural oil. Euonymus scale spends the winter as mated adult females that then lay eggs in the spring. Sign up to get all the latest gardening tips! Euonymus scale... Euonymus Scale Life Cycle. Euonymus grows vigorously, so pruning moderately in winter won’t hurt it terribly. Though they’re very small, you can see the crawlers as tiny yellow grubs on the leaves. Euonymus scale treatment is a game of timing. This usually happens in spring to early summer. If you miss this crawler stage, another should occur 6 weeks later. If your shrub is heavily infested, consider removing it and replacing with a holly or other plant. Control: Euonymus scale can be difficult to control. Q: 1. I recommend applying systemic insecticide imidacloprid (click for sources) in spring and also spraying what’s left of the shrub (after pruning) with horticultural oil (click for sources) three times per year (April, June, January). A more organic form of treatment is the introduction of lady beetles, natural predators of euonymus scale, as well as pruning of heavily infested branches. If your shrub is heavily infested, consider removing it and replacing with a holly or other plant. My variegated euonymus has lots of little white dots under the leaves and it doesn’t look very healthy. If you miss this crawler stage, another should occur 6 weeks later. Healthy plants that are not under water stress can better withstand and recover from scale feeding. Keep reading to learn more about how to get rid of euonymus scale. Be sure to follow label directions for hot weather application. You can apply the alcohol using a cotton swab or a cosmetic sponge. If the infestation is really bad, the plant may appear water stressed with leaves yellowing, drooping, and even falling off. Wear rubber gloves if you don’t want to touch the insects. Browse and purchase gardening books by Walter Reeves, plus select titles by other authors. Be sure to follow label directions for hot weather application. One common and sometimes devastating pest that targets these plants is the euonymus scale. Armored scale lives under a protective covering and feeds on plant juices. The young scales, called crawlers, have legs and will move very slowly, or are blown by the wind, to a spot on a plant that they like. If your shrub is only lightly infested, you can try the chemical route. If you notice scales on your plant, scrape at a few with your fingernail. A: In my experience, a heavy infestation of scale on euonymus is almost impossible to control without pruning to remove the majority of the leaves and insects first. How to Get Rid of Scale on Euonymus Shrubs Identifying Euonymus Scale. You’ll get regrowth in spring and summer. The scale insects may also appear like clusters of rice on plant leaves. 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Certain horticultural oils can also be used when the scales are in their shells because it forms a layer that literally suffocates them. If the scales simply crumble away dryly, all you have is the leftover shells of dead bugs and you don’t need to treat. You’ll get regrowth  in spring and summer. You can also remove the insects manually by rubbing them off the infected leaves and stems with your fingers. The best time for euonymus scale treatment is when they’re in their crawler stage, before they grow their protective shells. Euonymus is a family of shrubs, small trees, and vines that is a very popular ornamental choice in many gardens. A: In my experience, a heavy infestation of scale on euonymus is almost impossible to control without pruning to remove the majority of the leaves and insects first.
2020 how to get rid of scale on euonymus shrubs