![]() ![]() Pieces of tissue were cut from the lesion and disinfested with 1.5% NaOCl, transferred to PDA and incubated at 28 ☌. Compact mycelial masses and numerous whitish to dark brown sclerotia were observed on these plants. During December 2015, in sesame plantations of Guerrero, Mexico, plants with root and basal stem rot were collected. We comply with the Federal Trade Commission 1998 Children’s Online Privacy Protection Act (COPPA).Sesame ( Sesamum indicum L.) is an oleaginous crop of great importance worldwide. #Southern blight codeThe 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information is for educational purposes only. Quentin Tyler, Director, MSU Extension, East Lansing, MI 48824. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. ![]() ![]() #Southern blight fullMSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. 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. 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. ![]()
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