The chances of infection increase when water vapor -- or humidity -- in the air condenses as temperatures drop and dampens the begonias' leaves. Begonias are among America’s favorite shade plants, with lush leaves and splashy blossoms in a multitude of colors. Two powdery mildew fungi (Erysiphe cichoracearum and Oidium begoniae) infect begonias. Begonias with powdery mildew are infected by Odium begoniae. Repeat if necessary until the fungus is eliminated. A similar reaction may develop in a plant due to excessively dry conditions of the content, when it does not receive enough moisture either from air or from the soil. Luckily, you can treat the fungus effectively even without an exact diagnosis. Increase air circulation around your begonia plants. How to Control Pests & Disease for Marigolds, Missouri Botanical Garden: Begonia Tuberosa Group, Penn State Extension: Botrytis Or Gray Mold, University of California Integrated Pest Management: Floriculture and Ornamental Nurseries Begonia (Begonia spp. It is most likely botrytis, a fungal disease that attacks the flowers first. Leave several feet between container plants outdoors and avoid watering the plants from above. She currently divides her life between San Francisco and southwestern France. This species of fungus only infects begonias, but it will spread readily between begonia plants. Foliage varies among species in color, shape, texture and edging. High humidity and stagnant air encourage fungus; good air circulation inhibits and sometimes eliminates it. According to the California Integrated Pest Management program, products containing the following fungicides can be effective against botrytis: fenhexamid, azoxystrobin, iprodione, thiophanate-methyl, chlorothalonil and mancozeb. Greasy spots might form on the underside of infected leaves. © Copyright 2020 Hearst Communications, Inc. Run a fan near the plants or open a window if the plant is indoors. Pythium Rot: Seedlings die. The flowers, too, come in all shapes and sizes, including single or clustered, dainty or pendulous. Wind or water carry their spores to begonia leaves, but they need the right conditions to germinate. Prune off all dead or dying tissue from the begonias, including infected flowers, leaves and stems. Botrytis produces 60,000 spores on plant tissue no larger than your small finger nail. However, powdery mildew is also a possibility. If it rains a lot after the first application or if the plant offers new growth, repeat spray at the shorter interval. White, mealy fungal growth develops on leaves, flowers, and stems. Santa Cruz, a law degree from Berkeley's Boalt Hall, and an MA and MFA from San Francisco State. Various begonia cultivars thrive outdoors in U.S. Department of Agriculture plant hardiness zones 6 though 11. Powdery mildew also might affect the flowers of fibrous begonia varieties. If a fungus mars your begonia, it does not necessarily signal the plant's demise. If a fungus mars your begonia, it does not necessarily signal the plant's demise. Generally, they are healthy, low-care plants, but they are susceptible to a few fungal diseases like botrytis of begonia. Begonias with botrytis is a serious disease that can endanger the life of the plant. From Alaska to California, from France's Basque Country to Mexico's Pacific Coast, Teo Spengler has dug the soil, planted seeds and helped trees, flowers and veggies thrive. A fungus (Erysiphe cichoracearum) causes powdery, white spots to form on both lower and upper leaf surfaces. Meticulously remove every bit of fallen blossom and foliage. Apply a fungicide to protect plants. Remember that fungicide is poison and use it responsibly.
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