Disease Symptoms Pathogen/Cause Management; Anthracnose: Small spots pepper leaves of evergreen euonymus. The imposing shrub illuminates gardens with red-violet, late-summer berries and rose-red autumn leaves. Horticultural or neem oils sprayed according to the label specifications at temperatures below 90 F eliminate existing infections. Treating the disease means cutting out the galls and a minimal amount of surrounding wood so that air can dry the exposed tissue. Symptoms consist of a flat, white to gray growth primarily on the upper surfaces of the leaves, which can be partially rubbed off. It may defoliate a shrub. Delay feeding until the shrubs’ new spring foliage is completely open and the threat of rain has passed. In other cases, the spots drop out of the leaves, or the leaves shrivel up and drop off the plant. Still, it is unattractive. Symptoms include brown spots on the leaves and dark, sunken, cracked areas of wood. Diseases of the Euonymous Shrub. Anthracnose is a disease that affects a wide range of woody ornamental plants, including those in the Euonymus family. Although this disease is unattractive, it is not life-threatening. Euonymus shrubs are nothing if not versatile. Because Cercospora typically spreads through splashing water, rainy weather and overhead irrigation increase the likelihood of an attack. Over-watering and improper spacing may contribute to the development of fungal diseases and following good cultural practices can often prevent outbreaks. You can use a fungicidal spray to treat the plant. Euonymus plants are highly susceptible to crown gall, which is a disease caused by several different types of bacterium. The primary symptom is the development of large, round galls, which swell up on the branches of the plant. In other cases, the spots drop out of the leaves, or the leaves shrivel up and drop off the plant. Otherwise, you can ignore the disease, as it is not life-threatening, according to the University of Missouri. This is a fungal disease of Euonymus plants, meaning it is caused by one or more types of fungi. dead leaves Phyllosticta leaf spot sprays It is caused by the fungus Oidium euonymi-japonici. The spots’ darker centers may tear away. The white males are oval shaped, measure 1-2mm long and are generally to be found hanging around on the undersides of leaves. Powdery mildew results from the Oidium euonymi-japonici fungus. Spring rain splashes scab spores from infected leaf litter onto new leaves and stems, where they cause tiny, orange-bordered pale-gray spots. Any dropped leaves should be removed immediately, as the fungi can overwinter in the soil. This particular disease, which is rather common according to Clemson University, is caused by either the Cercospora detructiva fungus, the C. euonymi fungus or both. Hardy from U.S. Department of Agriculture plant hardiness zones 4 through 9, euonymus may be evergreen or deciduous, and are popular choices for hedges, borders and screens. Although euonymus (Euonymus spp.) Updated: July 31, 2016. Both bacterial and fungal diseases can affect euonymus shrubs. The rain-loving disease surfaces as tiny brown leaf and twig spots. This insect has a soft flattened body that is covered by a shell or scale. All Rights Reserved. Columnar, evergreen "Green Spire" (Euonymus japonicus "Green Spire"), at 6 to 8 feet high and 1 to 2 feet wide, is ideal for containers or narrow spaces. The primary symptom of the disease is the appearance of small brown marks on the leaves. Management must wait until the shrubs’ fall dormancy; measures include disposing of fallen leaves and pruning infected ones. Euonymus scale are big enough to see with the naked eye. This stubborn disease covers leaves with white fungal strands and may curl or scar tender leaf shoots. Anthracnose is a disease that affects a wide range of woody ornamental plants, including those in the Euonymus family. What these shrubs share with their entire genus is susceptibility to disfiguring diseases. When plants begin to show signs of infection, you may need to use chemicals to fight the disease. Learn which plants thrive in your Hardiness Zone with our new interactive map! Diseases. Pruning and disposing of severely infected branches and clearing away infected debris slow powdery mildew’s spread. Spray the plant with an insecticide if you notice increased insect activity on your shrub. Variegated-leaf euonymus shrubs have a heightened risk of contracting anthracnose. Affected areas of the plant can be pruned off if the galls are limited to one area. Prevent crown gall by guarding against insect infestations of the Euonymus, as the bacteria that cause crown gall can enter the plant on the bodies of insects. Plan the perfect garden with our interactive tool →, shrub-euonymus image by Jeffrey Zalesny from, Clemson University: Euonymus Diseases & Insect Pests. The genus Euonymus is a large group of plants composed of shrubs, vines and ground covers, according to Clemson University. Begin a systematic fungicidal treatment to prevent Anthracnose from harming your Euonymus and other woody plants. The genus Euonymus is a large group of plants composed of shrubs, vines and ground covers, according to Clemson University. diseases is obviously warranted since results have been so variable and the diseases are so important. As a result, Euonymus shrubs often lose their leaves, even those that are evergreen. The result is a stunted, weak shrub with dying branches of yellow leaves. As the disease advances, the lesions merge and the foliage yellows, dies and drops. Prune off infected areas and remove any dropped leaves from the soil. They infect plants through cracked or wounded tissue. Passionate for travel and the well-written word, Judy Wolfe is a professional writer with a Bachelor of Arts in English literature from Cal Poly Pomona and a certificate in advanced floral design. Euonymus shrubs are nothing if not versatile. Euonymus scale is a small sap-sucking insect that feeds on the stems and foliage of Euonymus. Some are evergreen, while others are deciduous. If your euonymus shrubs' leaves exhibit pale-brown, circular lesions, suspect Cercospora fungus. In large numbers, they block the passage of moisture and nutrients throughout the plant. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Control measures include removing infected leaves and debris and early-morning, irrigation with a soaker hose. Powdery Mildew: Powdery mildew is the most common and possibly the most difficult disease to control on euonymus. It is now found in gardens throughout Southern Britain. Look for a fungicide marketed as "all purpose" or "garden treatment" and apply it at regular intervals, starting in early spring, according to the directions on the package. Any dropped leaves should be removed immediately, as the fungi can overwinter in the soil. For more information on growing euonymus refer to HGIC 1063, Euonymus. During wet weather, bacteria move from the galls into the soil, where they survive for up to two years. Euonymus Diseases; Euonymus Diseases. Bacterial crown-gall disease on an euonymus shrub is hard to miss. Articles. Although this disease is unattractive, it is not life-threatening. Widely grown burning bush (E. alatus) stands 15 to 30 feet tall and spreads up to 15 feet. It became established in Britain on the south coast of England during the 1950s. Most active at temperatures between 60 and 80 degrees Fahrenheit, the fungus succumbs to strong sunlight and temperatures above 95 F. 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