CROWN ROT: In Cymbidiums

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

Article Blog   Article Index
The cause may be 1, too high nitrogen level during cult ivation of the seedlings; use Electric Conductivity reading of not more than 0.6, with a nitrogen to potassium proportion of 1:1:2. 2, Night temperature may be too cold for young plants, so use a minimum night temp erature of 50 Deg F., with a high night temperature of 64 dF to 68 dF and plants will grow better. 3, Too low moisture evaporation from the leaves when root pressure is too high; remove humidity from the greenhouse, 4, Too large pots cause water-logging. 5, Sprinkling water from above with fertilizer is effective in very early stages of growth. 6, Too low pH: calcium and potassium E.G. figures must be equal. OA87-162
Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading Crown Rot

Crown Rot Comments
CROWN ROT: Bacterial Disease Benomyl will not control it, use a bactericide and keep water out of the crowns. OIE87Jan-3 0
CROWN ROT: Characteristics It usually affects phalaenopsis; also called Southern blight (which see); dip plant in Natriphene. S201 0
CROWN ROT: Controls Use a piece of 1/4 inch tubing about 18 inches long for blowing water out of the crowns after watering; mark the mouthpiece end. OIE-85Jy-l 0
CROWN ROT: In Phalaenopsis Seedlings A preventive is Benlate as a spray or light drench; 1 ttpg.; A74-300; also, use Natriphene. OR69-272 0
CROWN ROT: Of Paphiopedilums In nature these plants grow in swamps under rain or under constant spray from waterfalls and they don't develop crown rot; but when water is allowed to stand in their crowns under warm temperatures it occurs. OD69-307 0
CROWN ROT: On Phalaenopsis Benlate stopped the rot but did not stop the plant's growth; if leaves are good, active lateral buds likely remain to continue the growth. A75-500; spray with Physan at 1/2 ttpg.; keikis frequently appear. A75-980 0
CROWN ROT: On Vandaceous Plants Pull the center leaves out of the crown, spray with Physan colution, apply a paste of fungicide powder (Dithane M-45) vitamin/hormone, Super-Thrive and water. A85-818Pull the center leaves out of the crown, spray with Physan solution, apply a paste of fungicide powder and water: (Dithane M-45) plus vitamin/hormone Superthrive. A85-818 0
CROWN ROT: Treatment Use Physan 20 or Natriphene; crown rot is not controlled by Benlate. A77-209 0

New Topics

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

Start a Topic

New Comments

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