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Use pruning shears and make the cuts within healthy parts of the plant. By creating an account you agree to the Hunker, University of Florida Mid-Florida Research and Education Center: Begonia Prooduction Guide, UC Statewide IPM Online: Floriculture and Ornamental Nurseries -- Begonia Disease Control Outlines, American Begonia Society: The Begonian -- Mildew, UC Statewide IPM Online: Powdery Mildew on Ornamentals, Master Gardeners of Santa Clara County: Powdery Mildew. Time the treatment for the the early morning or after dark, when bees aren't pollinating. Begonias with botrytis is a serious disease that can endanger the life of the plant. Although many plants can handle a powdery mildew infestation, the fungus can cause serious injury to begonias. It needs sunlight to trigger its mildew-killing properties, according to researcher Peter Crisp of Australia's Adelaide University. Her thousands of published articles cover topics from travel and gardening to pet care and technology. The catch is that the milk-and-water solution won't work on shade-garden begonias. Powdery Mildew. National Gardening Association: Got Mildew? Get Milk! Begonias are among America’s favorite shade plants, with lush leaves and splashy blossoms in a multitude of colors. Prune dense stems by cutting them back to above healthy sets of leaves to increase air circulation inside the plant. Do not apply high-nitrogen fertilizer at the end of the growing season. This species of fungus only infects begonias, but it will spread readily between begonia plants. Symptoms Spots on leaves, stems, and flowers with a white powdery coating. ), Penn State University Extension: Powdery Mildew, Weekend Gardener: Powdery Mildew (Erysiphaceae). Generally, they are healthy, low-care plants, but they are susceptible to a few fungal diseases like botrytis of begonia. Coat the begonias until they drip, being sure to hit the backs of the leaves. Run a fan near the plants or open a window if the plant is indoors. Frost isn't their only enemy; the humidity begonias love exposes them to powdery mildew. Powdery mildew is a fungal disease that is evident as a white or grey coating on the leaves of plants. Although many plants can handle a powdery mildew infestation, the fungus can cause serious injury to begonias. Powdery mildew is a fungal disease that is evident as a white or grey coating on the leaves of plants. and thousands of begonia cultivars can lift it from mundane to magical.As subtropical and tropical plants, most begonias survive winters outdoors in U.S. Department of Agriculture plant hardiness zones 10 through 11. © Copyright 2020 Hearst Communications, Inc. Repeat weekly as long as you see symptoms, and then every other week as long as the weather stays dry and temperatures remain between 60 and 80 degrees F. 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. Treat an infection culturally or organically before resorting to chemical fungicide. In calm, dry weather with a temperature below 90 degrees Fahrenheit, water the plants well. and thousands of begonia cultivars can lift it from mundane to magical. The begonia (Begonia spp.) Problems and Diseases With Regal Geraniums, University of California Integrated Pest Management: Floriculture and Ornamental Nurseries Begonia (Begonia Spp. Begonias grow in … The threat of infection is highest on begonias growing in shade at temperatures fluctuating between 60 and 80 degrees Fahrenheit. Sprinkling removes spores already on the leaves, and drowns the ones landing before the leaves dry. Elsewhere, they can be lifted before the first frost and stored indoors for the winter.