BACTERIAL BROWN ROT: Caused by Erwinia Cypripedii

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin about 6 years ago.

Small oval water-soaked spots in paphiopedilum leaves; change from light brown to deep chestnut enlarging steadily; can be suppressed by submerging in Natriphene at 1:2000 for 1 to 2.5 hours. BU49; OR77-166

Share on Social Media:

More The Orchid Doctor Articles under the Heading Bacterial Infection

Bacterial Infection	Comments
BACTERIAL BROWN SPOT: On Phalaenopsis Soft water-soaked lesion; turns black or brown; spray with Physan 20, 1/2 ttpg.; repeat as needed. A66-403; A73-888; AH19	0
BACTERIAL BROWN SPOT: Phytomonas Cattleyae Attacks cattleyas, and especially phalaenopsis and seedlings; small water-soaked spots; dirty green at first turn brown or black, enlarge rapidly; on phalaenopsis spot is blister-like and spreads rapidly to heart of plant and is fatal; cut out parts; soak community pots and plants for several hours in Natriphene or Anti-Damp; dry them out, spray with fungicide. BU47; N320	0
BACTERIAL BULB ROT: Erwinia Carotovora Found on cymbidiums; spots become soft, oozy, foul-smelling; cut off and destroy; spray other bulbs with Agri-Strep or similar with care. S205	0
BACTERIAL BULB ROT: Severe Damage to Valuable Cattleya, How to Save? Assuming roots are good, just cultivate well and a new eye will break. A73-816 (illus.); A79-785	0
BACTERIAL BULB ROT: Syringing Plants It's the best way to spread disease. A78-998 see also Brown rot; Brown spot; Miltonia scorch; Necrotic spots; Phalaenopsis (clear translucent spots); Soft rot	0
BACTERIAL DISEASES: Unusual Causes May include such factors as excremental deposits from birds (outeide), insects, rodents, lizards, etc., on leaves or in pots; for general sanitation use Physan occasionally. A80-1368; OBIV-267	0
BACTERIAL INFECTION: Phalaenopsis Leaves Yellowed, Shrivelled a Bit and Fell Off If phalaenopsis are grown too cold they are susceptible to bacterial infections; keep night temperatures at 66 to 68 degrees F. A69-242	0
BACTERIAL LEAF ROT: Erwinia Chrysanthemi a Bacillus In Hawaii; leaf rot in various orchids; water-soaked and yellow spots; preventive spray of Natriphene before wet weather and during recommended. N321	0
BACTERIAL LEAF ROT: On Leaves of Ascocendas Bordeaux mix not very effective against bacteria; try Physan at 15 ml. per gallon of water. A74-792	0
BACTERIAL LEAF SPOT: Control Basic copper sulfate (a fixed copper fungicide) at 1/2 ttpg. as spray recommended; or, Natriphene 1:2000 as drench. P71(2)24Formaldehyde 10% solution is very effective when applied solely to affected area; kills all tissue. P71(2)24	0
BACTERIAL ROT: Control Recommended Agri-mycin at about one-fifth the recommended dosage; spray no more than four times a year; if used more often it may cause deformities in flowers; use any time as pot treatment. OD73-139	0
BACTERIAL ROT: Treatment Rots caused by Pseudomonas can only be limited or arrested by a full dip in a bactericide such as Physan 20, at 15 ml. to 4 liters of water (3tpg.), a teaspoon is 5ml.; cut out diseased parts before drenching or soaking; spraying will not totally cure the problem. AU82-251	0
BACTERIAL SOFT ROT: Erwinia Carotovora, a Bacillus Incurable; rare; destructive; cattleyas most affected; destroy immediately rather than trying to heal; water-soaked green spots on leaf break open at slight touch; exudation contaminates the bench and area; foul smelling; destroy plant; drench bench, floor, etc., with mercuric chloride 1:1000; spray area with fungicide. N320+; OR74-234	0
BACTERICIDES: Recommended An effective one is Physan 20. A76-698 Recommended for orchids = Natriphene, Physan, tetracyclines, Polymixin B (Amphotericin). OD67-50 In Florida the only one officially named for use on orchids is Natriphene 97%. A86-1031	0

New Topics

Burt Holstein started topic Error in plant origination in category Cymbidiums
loan le started topic help with Clowesia Grace Dunn Chadd Ford Mericlone in category General Discussion
Jason heeres asked question Mediocalcar decoratum (Candy corn orchid) help in category Orchid Doctor
GIBSON PWASHIKAI asked question How do I get my orchid ID? in category General Discussion
Polly baker asked question Purchase orchid in category General Discussion

Ask a Question

Start a Topic

New Comments

Dennis Andison commented on article "Orchid Wiz - what will we do without you?" by Carol Holdren
loan le commented on topic "help with Clowesia Grace Dunn Chadd Ford Mericlone" by loan le
Carol Holdren commented on topic "Mediocalcar decoratum (Candy corn orchid) help" by Jason heeres
Carol Holdren commented on topic "How do I get my orchid ID?" by GIBSON PWASHIKAI
Arne Schon commented on orchid B. perrinii
Linda Thorne commented on member plant Rlc. Williette Wong 'The Best' by Linda Thorne
Carol Holdren commented on topic "Z. Redvale Jasmyn" by Shaun Bloodworth
Marie H Miller commented on member plant C. aclandiae by Kerrin Samm
Linda C Clark commented on orchid C. Madeleine Knowlton
Heather Williams commented on member plant Phal. equestris '‘996’' by Cara Anderson
Heather Williams commented on orchid Paph. Vintner's Treasure
Heather Williams commented on member plant Bct. Yuan Nan Mini 'Queen Anne' by Linda Thorne
Heather Williams commented on member plant Pths. racemiflora 'Seagrove Golden Fiddles' by Linda Thorne
Carol Holdren commented on topic "Chloraea Magellanica" by Harriet Schiele
Carol Holdren commented on topic "fredclarkeara kelly longley" by Kelly Longley
Carmen Bou-Crick commented on member plant Oncostele Wildcat var. 'Golden Red Star' by Carmen Bou-Crick
Henry Shaw commented on scheduled event "Diablo View Orchid Society Orchid Show & Sale" by Diablo View Orchid Society
Sharie Heckaman commented on member plant Paph. Magic Cherry by Linda Hartman
Linda Hartman commented on member plant B. nodosa by Linda Hartman
Robert H. Findlay commented on member plant Den. rigidum 'Tom's Image' by Tom Kuligowski