PSEUDOBULBS: Black

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin about 5 years ago.

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A fungus disease causes this on cattleyas; control it best by watering in the morning and provide good air circulation. A68-1107
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More The Orchid Doctor Articles under the Heading Pseudobulbs

Pseudobulbs Comments
PSEUDOBULBS: Blackening and Dying It is probably one of the black rot diseases; try Banrot at 1 ttpg. or Benlate at 1/2 ttpg. plus Truban at 1 ttpg. mixed. A76-403 0
PSEUDOBULBS: Broken To prevent infection expose the broken surface to air and allow the cells to dry. A71-1021 0
PSEUDOBULBS: Cracking Cattleyas sometimes develop horizontal cracks or breaks in their pseudobulbs and the upper part can break off under the weight of the flowers; the cause in not known; it may be genetic; illus. AH59It may be inherited or caused by the lack of boron; apply a solution of 1 tpg. of boric acid four or five times a year. S215; this will kill the plant OWD 0
PSEUDOBULBS: Disfigured by Horizontal Cracking These unusual splits are physiological disorders which weaken the pseudobulb: and easily cause breaking, sometimes by its own weight. A85-1335 0
PSEUDOBULBS: Dormant Too many of them on a plant often indicates that a poor root system exists. OD68-172 0
PSEUDOBULBS: Formation Short very fat ones on cattleyas are possibly genetic in origin; it may be caused by a deficiency of boron; make 1 tpg. of Boric acid and put 2 ttpg. of this in each gal. of fertilizer solution and use it every two months, A71-917 0
PSEUDOBULBS: Mature What constitutes maturity: it is when neither bulb or leaf is expanding, when roots are active, or inactive, but healthy during their rest period; ripe; fully made up. A70-535; OR78-177 0
PSEUDOBULBS: Rootless They still serve a purpose; if they have leaves and are plump, they contain and produce food. A75-803; A80-356 0
PSEUDOBULBS: Rotting When this happens, open up the potting mix if it is dense; watch for water with nutrient in the leaf joints which can cause bacterial damage; peat moss and sand in t he mix can also contribute to it. AU84-204 0
PSEUDOBULBS: Sheath Technically called the cataphyl, the membraneous covering is a protection to the new bulb and especially to the new eye; remove it only if it is loose. A68-7 0
PSEUDOBULBS: Shrivelling On cattleyas this means that humidity is low or that the potting medium is loose and is providing poor moisture distribution. A75-876 0
PSEUDOBULBS: Shrivelling During Rest Period Backbulbs may shrivel but those with leaf should not; you do not have to water on a humid cloudbathed tropical mountain.' A70-535 0
PSEUDOBULBS: Twisted Bulbs on Cattleyas These can develop for no apparent reason, except that water lodging in immature growths may be the cause. A85-832 0
PSEUDOBULBS: Wrinkled Back bulbs three to four years old show the natural aging process; it is hastened by over-watering and poor cultural practices. A78-309 0

New Topics

  1. Fritz wilke asked question What kind of orchid is this? in category General Discussion
  2. Robert Stagner asked question cattleya mossiae Willowbrook in category General Discussion
  3. Judith Pariseau asked question Paphiopedilum culture differences in category Paph Alliance
  4. Marc Lefkowitz asked question Bulbophyllum in category Bulbophyllums
  5. Tony Borowiecki asked question Can a Bealleara re-flower in category Oncidium Alliance

New Comments

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