BACTERIAL LEAF ROT: On Leaves of Ascocendas

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 6 years ago.

Article Blog   Article Index
Bordeaux mix not very effective against bacteria; try Physan at 15 ml. per gallon of water. A74-792
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 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

  1. Linda Francis asked question Plant in category General Discussion
  2. Mark Kaczynski asked question Looking for Dendrobium Jac-Hawaii 'Uniwai Pearl' in category General Discussion
  3. Angela Baxter started topic Catt. walkeriana in category Cattleya Alliance
  4. Luis Imatani asked question RLC/ LC Large flowered hybrids in category General Discussion
  5. Bill Overton asked question Phrag. Panther Run in category General Discussion

New Comments

  1. Edward Zapata commented on member plant Cym. Baltic Dew 'Freckle Face' by Edward Zapata
  2. Robert Rand commented on topic "Looking for Dendrobium Jac-Hawaii 'Uniwai Pearl'" by Mark Kaczynski
  3. Steven Kirincich commented on member plant Eny. Exotic Seashell by Steven Kirincich
  4. Carol Holdren commented on topic "Catt. walkeriana" by Angela Baxter
  5. Gonzalo Rotondaro commented on member plant Cattleya (Sophronitis) cerna by Laura Urban
  6. Steven Kirincich commented on member plant Lc. Little Oliver by Steven Kirincich
  7. Robert Rand commented on member plant Alcra. Winter Wonderland 'White Fairy' by Robert Rand
  8. Thuong Do commented on member plant Schom. tibicinis by Edward Zapata
  9. Bill Overton commented on topic "diseases" by Penny Edwards
  10. William Gorski commented on topic "Orchid Species: Vanda falcata h.v. Ryunotsume" by William Gorski
  11. Stefan Neher commented on topic "Stale Data" by Stefan Neher
  12. Susan Fairbairn commented on topic "diseases" by Penny Edwards
  13. Robert H. Findlay commented on topic "seed vs. pollen parent " by Robert H. Findlay
  14. Carol Holdren commented on topic "Photo of MaryAnn Coyle or Laura Ann Coyle" by Dana Coyle
  15. Mary Lane commented on member plant Dendrobium QT Makani by Mary Lane
  16. Brandy France commented on member plant Chz. Hsinying Pink Doll 'Hsinyijng' by Adam Almeida
  17. Roberto Lizama commented on topic "Help to ID" by Roberto Lizama
  18. Carol Holdren commented on topic "Brsdm GILDED URCHIN ONTARIO ORCHID" by Diana King
  19. Carol Holdren commented on topic "Compact DEN SUPERBUM ORCHID MINEATURE " by Diana King
  20. Pam Lipscomb commented on member plant Blc. Oconee 'Mendenhall' by Jeanne Uzar Hudson