COLLAR ROT: Orchid Wilt

Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

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A fungus Sclerotium rolfsii affects many orchids especially cymbidiums and phalaenopsis; the stem base turns light yellow then dark brown and spreads to roots and leaves; it thrives above 85 deg.F.; cut out diseased portions; immerse in Natriphene. N316; S202

Fungus disease caused by Sclerotium rolfsii; attacks base of plant, spreads to roots and upper parts; they turn yellow then dark brown; white mycelium can be seen on stems and basal sheathing leaves; hard round small bodies called sclerotia are formed by the mycelium; they can carry the disease to other plants; cut out the rot and treat plant with Natriphene. A73-814

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