... Several diseases can also affect euonymous shrubs, including cankers, spots caused by fungus and powdery mildew. The surfaces of leaves are covered with irregular patches or a thin layer of grayish white powdery mildew. Tropical Plants. Euonymus 'Manhattan' die back. https://www.wikihow.com/Get-Rid-of-Powdery-Mildew-on-Plants How do I cure white mold on euonymus? New York, Ne. A 2009 study by the University of Connecticut concluded that milk is just as effective than chemical applications (if not moreso) when it comes to treating powdery mildew. In late summer, tiny black dots are scattered over … Plants are notorious for powdery mildew; place in full-sun location with good air circulation to avoid it. Powdery Mildew - Euonymus Powdery Mildew. ... conditions, but they're pest prone and susceptible to scale, thrips, and spider mites. This may sound like a surprising solution, but milk is an extremely effective powdery mildew treatment. 0. It's in white powdery spots on the leaves. Question by ramonalponce June 3, 2010. Description. White patches of powdery mildew on euonymus leaf. Verticillium wilt is a disease that often shows up with sudden die-back of one large branch, or 1/2 of the plant. The infected leaves are yellow and may drop prematurely. Powdery mildew is a common disease on many types of plants and is prevalent under the diverse conditions found in many areas of California. What you describe sounds like a fungal disease called powdery mildew. Symptoms. Answer from NGA June 3, 2010. Species Euonymus alatus and its selections take sun or shade. Powdery mildew, Erysiphe lagerstroemiae , on crape myrtle shoot. via Couleur/pixabay.com. In Colorado, powdery mildews are common on ash, lilac, grape, roses, turfgrass, vegetables (such as cucurbits and peas), euonymus, cherry, apple, crabapple, pear and Virginia creeper, among others. - Knowledgebase Question. 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