BROWN ROT: In Paphiopedilums

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin about 4 years ago.

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Caused by the bacillus Erwinia cypripedii; starts as small chestnut brown spot on leaf; spreads to crown then to other leaves; spreads rapidly; plant can be saved by excision; soak for hours in Natriphene or Anti-Damp; repeat after a few days, two or three treatments. N320

Drench with Banrot, 1 ttpg. A66-406; A75-980 (illus.); A77-449

Small round to oval water-soaked spots, in middle of leaf; not common; spray with Physan 20, 1/2 ttpg. AH22

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Brown Rot Comments
BROWN ROT: Erwinia cypripedii Attacks paphiopedilums; bacterial brown rot starts as small roundish water-soaked yellow spots often in the middle of the leaf; changes to dark chestnut; may appear greasy; reaches growing point of plant and changes it to dark shrivelled mass; isolate plants; disinfect bench with Clorox 10%; destroy all leaves; spray with Physan 20, 1.5 tpg. or drench in Natriphene 1:2,000 tpg.). B40; BU49 0

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