SHEATHS: Within Sheaths

Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin over 3 years ago.

Article Blog   Article Index
In cat tleyas a sheath growth inside another sheath is a heritage from Cattleya labiata which does it most frequently; why? A87-616
Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading Sheaths

Sheaths Comments
SHEATHS: Blind On cattleyas are caused by insufficient light; hang them up close to the roof of the greenhouse. ODA72-134 0
SHEATHS: Browning C. skinneri sheaths naturally turn brown; but as it occurs more often in winter, poor light and ventilation either too dry or too humid could cause it; also too much water during the rest period; or the plant is just too plain weak to flower. OD88-9 0
SHEATHS: Bud On cattleya browning and dying off of sheaths is not likely to be caused by ethylene which would require a high concentration to cause it; most common cause in not known; to save the flowers remove the sheaths when they are yellowing. A77-922Yellowing or rotting of sheaths is caused by some factor unknown; if sheaths dry after yellowing, the buds inside should develop normally; remove early. A67-572; A80-513 0
SHEATHS: Buds Appear with No Sheath On cattleyas this is not unusual; not a disease, but characteristic. A70-631 0
SHEATHS: Buds Die Inside The cause may be dry rot or soft rot; after the yellowing, dryness will not affect normal development of buds; rotting and browning should be avoided by removal of the sheath; directions and illus. of removal. AH58 0
SHEATHS: Cattleyas Buds rotting inside can be caused by an accumulation of moisture in the sheath; caused by excessive watering, high humidity or rapid temperature change; do not overwater; cut off the tip. F77-16Do not mature in Louisiana; flower bud formation is influenced by length of day plus night temperature which can be too high in Louisiana; perhaps lighting left on in the growing area. A76-1007Drying of sheaths is common on winter and spring bloomers; remove them when they begin to yellow by tearing strips of the sheath downwards carefully to the pseudobulb, to let the buds develop; moisture and condensation in the dying sheath causes bud loss. A85-435No sheaths at all are produced; the cause in not known. A76-115; stimulate with good light and fertilizing. A80-630They appear but produce no blooms; the cause may be excessive fertilizing; remove the sheaths. A69-424; A75-1090They turn black and withered mostly because of water standing in the leaf-blade where the sheath begins. A83-24They turn... 0
SHEATHS: Double It is not uncommon for one sheath to form inside another on cattleyas; flowers develop properly; remove any yellow outer sheaths. A72-151; A76-1007; OD73-2On cattleyas; C.labiata or its hybrids normally have a double sheath; it should flower in the fall. OD73-2 0
SHEATHS: Dry It is a normal condition with Cattleya mossiae, and its hybrids and some other cattleyas. OD73-2 0
SHEATHS: Growth Is Poor and After Starting They Turn Dry or Brown The cause is not fully known; may be caused by air pollution or poor health, or not enough light; remove the sheaths, the buds will usually bloom. A76-795 0
SHEATHS: Infection, Bacterial It occurs particularly in hot, humid climates; caused by Pseudomonas bacteria; Physan 20 provides partial control; use it at 1 cc. per gal. of water as spray. A74-780+ 0
SHEATHS: Removal Effect on Buds Removal of the sheath does no harm but the bud stems may be weakened. A72-55 0
SHEATHS: Rotting Caused by Water Apparently water collecting around the base of the sheath can rot both sheath and buds within; illus. A77-436 0
SHEATHS: Sequence of Growth The sheath develops along with the new pseudobulb growth. A63-478 0
SHEATHS: Yellowing Causes are not fully known, although ethylene can be suspected; some plants produce sheaths which yellow than go brown before the buds are initiated and they still flower normally. A82-122 0
SHEATHS: Yellowing on Dozens of Apparently Healthy Plants The primary cause is not known; it is relatively normal on Cattleya mossiae and some hybrids; some may brown, soften and kill the buds; remove such. A74-34 0

New Topics

  1. Maria Delaney asked question Double spikes on oncidiums in category Oncidium Alliance
  2. Darrin Duling asked question unknown Oncidium intergeneric in category General Discussion
  3. Darrin Duling asked question need id on oncidium intergeneric in category General Discussion
  4. Kate McMillan started topic Horticultural Charcoal vs Activated Charcoal in category General Discussion
  5. Susan smith asked question Vanda Samsri Gory in category General Discussion

New Comments

  1. Melvin Waki commented on member plant Hwra. Lava Burst by Jeanne M Uzar
  2. Carol Holdren commented on member plant Den. Ruth Chun's Gemini by Melvin Waki
  3. Samuel Yanos commented on member plant Coel. rochussenii 'Waki' by Melvin Waki
  4. Mo Chen commented on member plant Den. longicornu by Mo Chen
  5. Yahoo Alex commented on member plant Habenaria Tanager by David Nickerson
  6. Adam Almeida commented on member plant Chz. Hsinying Pink Doll 'Hsinying' by Melvin Waki
  7. Alex Maximiano commented on member plant V. Boschii by Adam Almeida
  8. Carol Holdren commented on member plant Ar. graminifolia by Adam Almeida
  9. Melvin Waki commented on member plant Pol. neobenthamia by Adam Almeida
  10. Carol Holdren commented on member plant V. Nopporn White Diamond by Adam Almeida
  11. Melvin Waki commented on member plant V. Yip Sum Wah 'Flame' by Tanya Lam
  12. Tanya Lam commented on member plant Gra. stapeliiflora 'Waki' by Melvin Waki
  13. Gustavo Sánchez commented on orchid Lc. Blue Rose
  14. Carol Holdren commented on member plant Aerdv. Somsri Sunlight by Mary Lane
  15. Tanya Lam commented on member plant Cym. finlaysonianum by Tanya Lam
  16. Alex Maximiano commented on member plant Lc. Dinard 'Blue Heaven' by Melvin Waki
  17. Carol Holdren commented on member plant Rth. Yellow Bouquet 'Pam' by Melvin Waki
  18. Carol Holdren commented on member plant V. falcata var. Hisui by Tanya Lam
  19. David Nickerson commented on member plant Ctsm. Edgardo A. Pauneto 'Dark Stripes' by David Nickerson
  20. Carol Holdren commented on member plant Phal. violacea var. indigo 'Royal Blue' by Vickie Seibert