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