Orchid doctor

BACTERIAL INFECTION: Phalaenopsis Leaves Yellowed, Shrivelled a Bit and Fell Off

Ailments Orchid Doctor

by Robert M. Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin over 2 years ago.

Article Blog   Article Index
If phalaenopsis are grown too cold they are susceptible to bacterial infections; keep night temperatures at 66 to 68 degrees F. A69-242
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 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

  1. William Schinella asked question I want to know how to name this plant in category General Discussion
  2. John Marmaro asked question Availability of a particular primary hybrid in category Cattleya Alliance
  3. Jerri campbell asked question Identify this plant. in category Cattleya Alliance
  4. Richard Whyte asked question unable to add orchid to my collection in category General Discussion
  5. Picture 1 Michael Pye asked question Labels in category OrchidWiz

New Comments

  1. Image Carol Holdren commented on topic "I want to know how to name this plant" by William Schinella
  2. 92f7c225 2490 4d3b 822c 2f4b8f30d6b8 Mary Lane commented on member plant Ons. Wildcat var. Golden Red Star by Mary Lane
  3. Image Carol Holdren commented on topic "Availability of a particular primary hybrid" by John Marmaro
  4. Image Carol Holdren commented on topic "Identify this plant. " by Jerri campbell
  5. Image Carol Holdren commented on member plant Den. chrysanthum var. ? no idea, or if this is a cross by Richard Whyte
  6. Richard Whyte commented on topic "unable to add orchid to my collection" by Richard Whyte
  7. 00100lportrait 00100 burst20190402193145369 cover Sally Guan commented on member plant Den. delicatum by Sally Guan
  8. Bio Alex Maximiano commented on topic "Labels" by Michael Pye
  9. Image Carol Holdren commented on member plant Phal. Yu Pin Easter Island var. 619 by Mary Lane
  10. 92f7c225 2490 4d3b 822c 2f4b8f30d6b8 Mary Lane commented on member plant Phal. OX Golden Apple ''Honeycrisp"' by William Gorski