BACTERIAL LEAF SPOT: Control

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

Basic copper sulfate (a fixed copper fungicide) at 1/2 ttpg. as spray recommended; or, Natriphene 1:2000 as drench. P71(2)24

Formaldehyde 10% solution is very effective when applied solely to affected area; kills all tissue. P71(2)24

Share on Social Media:

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 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

Danielle Carbonneau asked question phalaenopsis, dendrochum and Odontoglossum in category Phalaenopsis
Nicholas Filannino asked question Phalaenopsis William Kistler? in category General Discussion
Mark Farran asked question How to open and read articles listed in category General Discussion
Juliann Eckhard started topic Cattleya little susie in category Cattleya Alliance
Shannon Gardea asked question NELLY ISLER in category General Discussion

Ask a Question

Start a Topic

New Comments

Louis Wilson commented on member plant E. alata f. alba by Louis Wilson
Julie Ellner commented on member plant Phal. amabilis var. formosanum by Vickie Seibert
Julie Ellner commented on member plant Rlc. Green Dragoon 'Mendenhall' by Jeanne Uzar Hudson
Danielle Carbonneau commented on member plant Ons. Catatante 'Los Roble' by Henry Shaw
Barry J Silver commented on orchid Lyon. SunCoast Pink Passion
Carol Holdren commented on topic "Phalaenopsis William Kistler?" by Nicholas Filannino
Carol Holdren commented on orchid Colm. Eric Gabriel Heines
Carol Holdren commented on topic "Cattleya little susie" by Juliann Eckhard
Carol Holdren commented on member plant Bc. Morning Glory by Chris Siolo
R .Benson commented on member plant Kir. New Hybrid (Fred Clarke) SVO9831 by R .Benson
Carol Holdren commented on topic "Blooming Stenglottis Venus “jamboree “" by John Urey
Jeanne Uzar Hudson commented on member plant Lc. Canhamiana var. coerulea 'Cobalt' by Jeanne Uzar Hudson
Jeanne Uzar Hudson commented on member plant Sns. gemmata by Jeanne Uzar Hudson
Stefan Neher commented on topic "Orchid roots .com site?" by Mary Lane
Kevin Barry commented on member plant Bul. Tammie Sue Pernas by Tony Pernas
Linda Hartman commented on member plant Ctt. Final Blue by Linda Hartman
Kevin Bergeson commented on member plant Paph. rothschildianum by Kevin Bergeson
Carol Holdren commented on topic "recently purchased orchid shows unstoppable roots " by David George
Michael Makio commented on orchid V. Beatrice Makio
Carol Holdren commented on topic "shorter stem with less vigorous blooms" by katherine mott