This may sound like a surprising solution, but milk is an extremely effective powdery mildew treatment. Verticillium wilt is a disease that often shows up with sudden die-back of one large branch, or 1/2 of the plant. Tropical Plants. Description. Plants are notorious for powdery mildew; place in full-sun location with good air circulation to avoid it. How do I cure white mold on euonymus? ... Several diseases can also affect euonymous shrubs, including cankers, spots caused by fungus and powdery mildew. Powdery mildew, Erysiphe lagerstroemiae , on crape myrtle shoot. ... conditions, but they're pest prone and susceptible to scale, thrips, and spider mites. White patches of powdery mildew on euonymus leaf. The surfaces of leaves are covered with irregular patches or a thin layer of grayish white powdery mildew. Powdery mildew is a common disease on many types of plants and is prevalent under the diverse conditions found in many areas of California. Powdery Mildew - Euonymus Powdery Mildew. Answer from NGA June 3, 2010. Even though there are several types of powdery mildew fungi, they all produce similar symptoms on plant parts. Symptoms. Question by ramonalponce June 3, 2010. New York, Ne. Euonymus 'Manhattan' die back. - Knowledgebase Question. 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. via Couleur/pixabay.com. What you describe sounds like a fungal disease called powdery mildew. 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. Species Euonymus alatus and its selections take sun or shade. The infected leaves are yellow and may drop prematurely. It's in white powdery spots on the leaves. https://www.wikihow.com/Get-Rid-of-Powdery-Mildew-on-Plants 0. 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