Description The female scale lives under a gray or brown shell, shaped somewhat like an oyster shell. The newly hatched crawlers are also orangish is appearance. Euonymus is a family of shrubs, small trees, and vines that is a very popular ornamental choice in many gardens. Euonymus Scale on Euonymus. Controlling euonymus scale bugs can be … Scale (or armored scale) describes a common family of insects that feed on various shrubs and trees. This scale also attacks a number of other plants such as English ivy, hibiscus, holly, honeysuckle, lilac, and pachysandra. Both suck on plant tissue, which can cause damage. It is particularly a problem on evergreen euonymus such as Euonymus japonica, but E. kiautschovica (=sieboldiana) appears to resist heavy attacks of euonymus scale. Life History The female scale is usually found along the stems and leaf veins of the host plant. There are at least two generations per year. When infestations are heavy, the whole plant may be whitened by the smaller male scales. When infestations are heavy, scales encrust leaves and branches, with feeding damage causing defoliation and branch dieback. Planting less susceptible varieties can reduce the need for scale control. Nonchemical Control Currently, the Korean lady beetle is being evaluated as a predator of the euonymus scale, but is not available commercially. It is particularly a problem on evergreen euonymus such as Euonymus japonica, but E. kiautschovica (=sieboldiana) appears to resist heavy attacks of euonymus scale. Pruning out heavily infested branches may help in reducing scale populations. The euonymus scale, Unaspis euonymi, is an armored scale that can cause complete defoliation or even death of the evergreen Euonymus. The nymphs crawl to other parts of the host plant or are blown to other susceptible hosts. Click on image for larger version Figure 1. Click on image for larger version Figure 2. Symptoms and Effects: Euonymus scales feed on plant sap. Euonymus Scale Unaspis euonymi. Individual scales are small and are often overlooked until serious damage has occurred. Damage The euonymus scale can cause complete defoliation and even death of the plant if infestations are heavy. Euonymus Scale. Feeding damage first appears as yellow spots on leaves. One common and sometimes devastating pest that targets these plants is the euonymus scale. Chemical Control Control of the euonymus can be achieved by applying a crawler spray in early June with 4 applications 10-12 days apart. The eggs laid by the female are usually orange-yellow. Dormant oil applications may also be applied for control of overwintering females. Euonymus scale males are smaller than females, white and elongated. Eggs are deposited in early spring beneath the dark-colored scale covering and hatch over a period of two to three weeks in early June. The males produces a smaller white covering and can be quite numerous. The scale overwinters as a fully-grown, fertilized female. Damage The euonymus scale can cause complete defoliation and even death of the plant if infestations are heavy. One type of scale that attacks euonymus shrubs (especially Euonymus japonica) is the euonymus scale (Unaspis euonymi).This is an armored type of scale that comes in two colors: Males are white and females are brown.
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