Orchid doctor

BACTERIAL ROT: Control Recommended

Ailments Orchid Doctor

by Robert M. Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin over 1 year ago.

Article Blog   Article Index
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
Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading Bacterial Infection

Bacterial Infection Comments
BACTERIAL BROWN ROT: Caused by Erwinia Cypripedii 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 0
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: 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
  1. Raina Steiner asked question Ellison Onizuka in category General Discussion
  2. Paph hsinying jewel x paph hsying jewel september 09 2018 Adrienne Alexander asked question How to add a not-listed plant in category General Discussion
  3. Juan Martin Cabrejos asked question Any idea of this Cattleya? in category General Discussion
  4. Karl Olsen asked question Phalaenopsis Hope Star in category Phalaenopsis
  5. Brenda Sharpe asked question Dendrobium clavator in category General Discussion
New Comments
  1. Dsc 0747 Kathleen Kust commented on topic "Ellison Onizuka" by Raina Steiner
  2. Paph hsinying jewel x paph hsying jewel september 09 2018 Adrienne Alexander commented on topic "How to add a not-listed plant" by Adrienne Alexander
  3. Image Carol Holdren commented on member plant Rly. Raspberry Lemonade by Paul Keller
  4. Wbf4kvs Sys Admin commented on topic "Any idea of this Cattleya?" by Juan Martin Cabrejos
  5. Wbf4kvs Sys Admin commented on topic "Phalaenopsis Hope Star" by Karl Olsen
  6. Image Carol Holdren commented on topic "Dendrobium clavator" by Brenda Sharpe
  7. Greg Barne commented on topic "Using triacontanol on orchids" by Greg Barne
  8. Image Carol Holdren commented on member plant Phal. bellina by Andry Harmony
  9. Wbf4kvs Sys Admin commented on orchid Doc. teretifolia
  10. Wbf4kvs Sys Admin commented on orchid Den. clavator