The waxy cover of a mature female is approximately 2 mm long, grayish-brown, flattened, and pear-shaped (Fig. Read and follow directions and safety precautions on labels. Get notified when we have news, courses, or events of interest to you. To reduce populations of first generation crawlers, apply a registered insecticide according to label directions during late May through June. Both suck on plant tissue, which can cause damage. Scale (or armored scale) describes a common family of insects that feed on various shrubs and trees. LEARN HOW TO STOP THE INVASIVE SPOTTED LANTERNFLY, Coronavirus: Information and resources for the Extension Community, Save For Later Print Available in Spanish, Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org. View our privacy policy. An infestation of this armored scale may result in twig dieback or death of the plant. This armored scale insect is native to Japan and China. Eggs hatch over a 2-3 week period into first instar nymphs called crawlers. Authored by: Gregory A. Hoover, Sr. Extension Associate. Euonymus Scale (Unaspis euonymi): This is the most common and most serious pest found on euonymus.The protective armor covering of an adult female euonymus scale is dark, oyster-shaped and about 1 / 16-inch in length.Adult males are very small, winged insects that leave their narrow, white armored covering for mating. Four to six weeks are usually required to complete development to adults. This lady beetle is 3- 4.5 mm long, black with two red spots on its wing covers. Adult euonymus scale waxy cover (a. male; b. female). This is especially true with various vine types of euonymus. JavaScript seems to be disabled in your browser. Pesticides are poisonous. Dispose of empty containers right away, in a safe manner and place. Entering your postal code will help us provide news or event updates for your area. Do not contaminate forage, streams, or ponds. 1a). This armored scale insect is native to Japan and China. Euonymus is a family of shrubs, small trees, and vines that is a very popular ornamental choice in many gardens. The crawlers wander over the bark and foliage for a short time, settle, and then begin to feed. It does this with its piercing-sucking mouthparts that results in a reduction of plant health and yellowish stippling or spotting of the foliage. Second generation crawlers should be managed with applications made during late July through August. Figure 1. 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. This armored scale overwinters as fertilized females. The crawler stage of this key pest is about 0.3 mm long and yellowish-orange. Individual scales are small and are often overlooked until serious damage has occurred. See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement. 1b). The lady beetle, Chilocorus kuwanae, was introduced several years ago in the eastern United States to assist with the management of euonymus scale. The euonymus scale is a key pest of deciduous and evergreen euonymus, Euonymus spp., pachysandra, Pachysandra spp., and bittersweet, Celastrus spp. Heavy infestations may occur on twigs or leaves that can cause defoliation of the plant. By entering your email, you consent to receive communications from Penn State Extension. You must have JavaScript enabled in your browser to utilize the functionality of this website. They begin laying eggs beneath their protective cover in late April and May. It is now established in the United States and Canada. This pest is most difficult to effectively manage at the base of infested plants near the ground. It is now established in the United States and Canada. This scale also attacks a number of other plants such as English ivy, hibiscus, holly, honeysuckle, lilac, and pachysandra. Vine-type euonymus are extremely susceptible to attack by this scale. One common and sometimes devastating pest that targets these plants is the euonymus scale. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Why do we need this? This armored scale insect is native to Japan and China. The euonymus scale is a key pest of euonymus, pachysandra, and bittersweet. This key pest causes injury to host plants by removing fluid from non-vascular plant cells. The euonymus scale, Unaspis euonymi, is an armored scale that can cause complete defoliation or even death of the evergreen Euonymus. Controlling euonymus scale bugs can be … A second generation of crawlers is produced during late July through August. The male's white, narrow, waxy cover is about 0.8 mm long (Fig. Description Males feed and develop under their waxy covers, mate with the females, and die. The euonymus scale is a key pest of deciduous and evergreen euonymus, Euonymus spp., pachysandra, Pachysandra spp., and bittersweet, Celastrus spp. Prune and destroy heavily infested branches or twigs when indicated. Adult males emerge as tiny wasp-like insects. Vine-type euonymus are extremely susceptible to attack by this scale.