ROTS: Pseudobulbs

Ailments 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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Bulb rot or black rot is caused by Pythium and Phytophthora, which are closely related soil-inhabiting fungi whi ch spread under warm wet conditions and can be splashed about with a hose; try to apply chemicals as protective measure, especially in early spring; Fungarid is one such recommended in Australia. AU83-250
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ROTS: Fungal and Bacterial Those that attack roots, pseudobulbs and leaves are numerous and have difficult names; here they are listed, illustrated for recognition and their controls supplied; to avoid meeting up with any of them it is recommended that you use a periodic spraying with Physan at 1 to 1.5 tpg. monthly as "preventative maintenance"-, which may not be approved by all. A82-479; address for identification service. OIE88Apr-l 0
ROTS: Fungus or Bacterial Systemic controls that are recommended for use on seedlings or mature plants include such names as Benlate and Difolatan especially for fungal problems; Black rot and Brown rot are both caused by bacteria and they are best controlled by Truban, which is available in most nurseries. OIE85Jy-7 0
ROTS: On Cymbidiums This is usually Black rot; the plants can be saved by scraping all the rot off the pseudobulbs and removing the roots to allow air to inhibit the continued growth of the anaerobic bacteria which is the root of the problem. A88-35 0

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