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Greenhouse crops prone to infection include African violet, Begonia, Dahlia, gerbera daisy, Hydrangea, roses, Verbena, Kalanchoe, and poinsettia. the reduction of the powdery mildew damage to Zinnia (Zinnia elegans Jacq. Jay W. Pscheidt, 2014. It travels by airborne spores, and thrives when nights are moderately cool and foliage stays damp. Powdery mildew, common on zinnias and other crops in mid-summer, starts with just a few spots on the lower leaves, as shown in this photo. We grew and monitored nine types of zinnias. Zinnia – Powdery mildew. Powdery mildew affects over 10,000 plants. Let’s not complain!” Of course, no sooner had a I said that, then I saw this out on our zinnias: Yes, my friends, that is none other than the pesky fungus, Powdery Mildew. Cause Golovinomyces spadiceus (formerly Erysiphe cichoracearum), a fungus. ʻMagellanʼ), an experiment was carried out as a factorial experiment in the form of a randomized complete block design with two factors including eight treatments and three replications. As warm, dry weather settles in this month, be alert for the development of powdery mildew on crops. Powdery mildew is a fungus that appears as gray or white splotches on leaves, stems and flowers of zinnias and other ornamentals and some vegetable plants. The disease is considered more unsightly than harmful. Powdery mildew can cover leaves and stems late in the growing season. Many commonly grown annual and perennial flowering plants, as well as ornamental grasses, can be infected by powdery mildew. Without treatment, it will spread to shoots and buds and eventually kill the plant. Death of the plant is rare. Powdery mildews are one of the most common diseases of ornamental plants; many nursery,flower, and woody plants are susceptible. Overwinters as either chasmothecia or conidia on infected plants. Jay W. Pscheidt, 2014. But zinnia lovers needn't forgo the cheerful blooms. THE NINE-ZINNIA TEST . Zinnia-Powdery Mildew. You can expect great performance from several types--even in powdery mildew country. Dreamland, Peter Pan, Rainbow, Ruffles, and Sunshine have 2- to 3-inch-wide leaves and large (3- to 3 1/2-inch-wide) double flowers. Powdery mildew is caused by a fungus and is seen as a light gray or whitish powder on the surface of leaves. Symptoms and Diagnosis. By Lynn Byczynski. See: Greenhouse Plants, Ornamental-Powdery Mildew. It occurs following warm days and cool nights often being seen in the fall and spring. 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