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Hark Orchideen - Competence in Orchids  
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Your position: Information on crop protection > Overview > Sclerotium > Biology  « backprint
Biology Damage Control Pictures
Southern Blight or Sclerotium rot
The causative organism of Southern Blight, Sclerotium rolfsii Sacc. (= Athelia rolfsii), is a fungus that lives on the ground and does not form spores, similar to Rhizoctonia. High temperatures help it to grow quickly, optimal temperatures are between 27°C and 30°C. The fungus needs a lot of oxygen, infestation starts in the upper substrate layers at the root neck or stem base. Roots in the substrate are not infested. Sclerotium can hardly grow in cool, humid substrates.
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