SHEATHS: Infection, Bacterial

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin over 4 years ago.

Article Blog   Article Index
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+
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: 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: Within Sheaths In cat tleyas a sheath growth inside another sheath is a heritage from Cattleya labiata which does it most frequently; why? A87-616 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. Rae Walker asked question Dendrobium No I’d. HELP! in category Dendrobiums
  2. John Hyatt asked question Deformed growths on BLC King of Taiwan in category Cattleya Alliance
  3. Darrin Duling asked question Unidentified Bratonia in category General Discussion
  4. Armando Mantellini started topic Cattleya jenmanii missing awards in category Cattleya Alliance
  5. Darrin Duling asked question Phragmipedium Cape Sunset or Eric Young? in category Paph Alliance

New Comments

  1. Carol Holdren commented on topic "Dendrobium No I’d. HELP!" by Rae Walker
  2. Carol Holdren commented on article "CATTLEYAS: Control of Blooming Time" by Robert M. [Bert] Hamilton (Compiler)
  3. Carol Holdren commented on member plant Lc. Nice Holiday 'Suntopia' by William Gorski
  4. Robert H. Findlay commented on topic "Phragmipedium Cape Sunset or Eric Young?" by Darrin Duling
  5. Robert H. Findlay commented on member plant Phrag. Ecuagenera Dream by Robert H. Findlay
  6. Tatjana Opekunova commented on article "CATTLEYAS: Reasons for Non-flowering" by Robert M. [Bert] Hamilton (Compiler)
  7. Carol Holdren commented on member plant Zygopetalum var. Big Red One by Wyatt Parker
  8. Carol Holdren commented on topic "Need ID, Please" by Oliver Quin Surco
  9. Sara D commented on member plant Phal. bellina var. Coerulea by Sara D
  10. Debbie Chase commented on topic "Identify This Orchid " by Debbie Chase
  11. Andrew Chan commented on member plant V. Yano Blue var. Ploenpit by Mary Lane
  12. William Gorski commented on member plant Alcra. Tropic Lily 'Hilo Space Ship' by Mary Lane
  13. Osura Mindula Gunasena commented on topic "Help to Identify the Id of this Vanda" by Osura Mindula Gunasena
  14. Renee Hawes commented on member plant Phal. I-Hsin Spot Eagle var. I-Hsin Spot Eagle 'Montclair' AM/AOS 'Ta-Lin Spot x Black Eagle' by Renee Hawes
  15. Renee Hawes commented on member plant Phal. Liu's Berry by Renee Hawes
  16. Renee Hawes commented on member plant Phal. Yushan Christopher var. Harlequin 'Little Panda' by Renee Hawes
  17. Carol Holdren commented on topic "How to repot a Mattie Shave" by Pam Alexander
  18. Frank Cambas commented on member plant Zns. Cynosure var. Blue birds by Ben MG
  19. Robert H. Findlay commented on topic "Lady Bug or dangerous bug" by John Small
  20. Robert H. Findlay commented on topic "Help with ID of this Eria sp." by Robert H. Findlay