Category: Orchid Doctor

BACTERIAL BULB ROT: Syringing Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago 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 Read More

BACTERIAL DISEASES: Full Listing

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago For data on causes, hosts, symptoms, controls, etc., of every one ever reported as attacking orchids, refer to OBIV-292 Read More

BACTERIAL DISEASES: Unusual Causes

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago 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 Read More

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

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago If phalaenopsis are grown too cold they are susceptible to bacterial infections; keep night temperatures at 66 to 68 degrees F. A69-242 Read More

BACTERIAL LEAF ROT: Erwinia Chrysanthemi a Bacillus

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In Hawaii; leaf rot in various orchids; water-soaked and yellow spots; preventive spray of Natriphene before wet weather and during recommended. N321 Read More

BACTERIAL LEAF ROT: On Leaves of Ascocendas

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Bordeaux mix not very effective against bacteria; try Physan at 15 ml. per gallon of water. A74-792 Read More

BACTERIAL LEAF SPOT: Control

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago 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 affect... Read More

BACTERIAL ROT: Control Recommended

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago 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 Read More

BACTERIAL ROT: Treatment

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago 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 befor... Read More

ACID OR ALKALINE: Changing the Values

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Various means can be used: tufa, a limestone form, can be added to paphiopedilums from limestone cliffs; bark composts acidify with age; peatmoss, pine needles, oak leaves in the mix produce acidit... Read More