Dieback of Hosta infected with Southern blight Yellowing of Hosta foliage infected with Southern blight Base of stem severely rotted Sclerotium rolfsii sclerotia on stem and soil surface ![]() Resources for additional information: Crown Rot, A Serious Disease of Hosta and Other Ornamentals, an Iowa State University Extension publication, Feb. Fungicide applications (drenches or incorporation of granular materials) can be used preventatively to control crown rot. rolfsii. Limit use of mulch in sites with a history of S. Mulch used around field grown plants or plants in the landscape may favor growth of S. Management: Good sanitation and pathogen exclusion are important steps in limiting disease. Carefully inspect incoming plant material for signs of disease. Remove and destroy affected plants, avoid spreading soil from infected areas. Spread: This is a soil borne pathogen, movement of soil or diseased plant material spreads the disease. The pathogen can persist for extended periods of time in soil as sclerotia. During hot, humid conditions sclerotia germinate producing fungal mats that can infect susceptible hosts. Sclerotium rolfsii rarely produces spores, so dispersal by air movement is not significant. Symptoms: Wilting, water soaked lesions on succulent stems and petioles, crown rot, plant collapse and death. Fluffy fungal mats may be present on the soil surface or on affected plant tissues. Light brown sclerotia, about the size of mustard seeds may also be present in clumps on the affected plant tissue. ![]() Have a question about ornamental plant care? Submit your question to Ask an Expert.īy Dave Clement, Principal Agent, University of Maryland Extension, Home & Garden Information Center Yard & Garden Author:Dave Clement, Diseases, Southern blight, WiltingĮnter your email address to follow this blog and receive notifications of new posts by email.Hosts Include: Ajuga, Anemone, Aquilegia, Campanula, Coreopsis, Delphinium, Dianthus, Digitalis, Helianthus, Hosta, Lathyrus, Liatris, Lilium, Limonium, Lupinus, Monarda, Penstemon, Phlox, Rudbeckia, Salvia, Scabiosa, Sedum, and Veronica. Visit the Home & Garden Information Center for more information on Southern blight.
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