The Orchid Doctor Articles under the Heading Southern Blight

Southern Blight Comments
SOUTHERN BLIGHT: Sclerotium Rolfsii It frequently attacks orchids and is commonly known as Crown rot; it is widespread in warmer areas; a rapid collapse and rotting of roots, pseudobulbs, lower parts of leaves which show cream-yellow then turn brown; the tan, tiny sclerotia is diagnostic; affected plants must be destroyed; treat containers and potting media with a 4% formalin solution; dip the plants for 60 minutes in Natriphene or 8-Quinolinol at the rate of 1 to 2000 water. AH86-75 0
SOUTHERN BLIGHT: Sclerotium Rolfsii, Etc. Crown rot may be rare in places but can be devastating; especially in phalaenopsis and cymbidiums; the fungus rots the pseudobulbs and the bases of the leaves; watery, creamy yellow, changes to soft brown rot; remove diseased parts and the potting mix; dip in Natriphene 1:2,000 for one hour. BU41 0
SOUTHERN BLIGHT: Sclerotium Rolfsii, Pellicularia Sp. Crown rot; infrequent but devastating especially in warmer parts of the world; attacks roots, pseudobulbs, lower part of leaves; control: sterilize pots and media with 4% formalin; dip plants in Natriphene 1:2,000 for one hour. A66-403; A79-784 (illus.); refer to AH19 0

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