Orchid doctor

CROWN ROT: Of Paphiopedilums

Ailments Orchid Doctor

by Robert M. Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin about 3 years ago.

Article Blog   Article Index
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
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 Cymbidiums 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 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: 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. Henry Shaw started topic Missing Gan Lin phal variety in category General Discussion
  2. 92f7c225 2490 4d3b 822c 2f4b8f30d6b8 Mary Lane started topic Orchid not found in Orchids.Org in category General Discussion
  3. cello mazza yuwa asked question Intergeneric name in category Vandaceous
  4. Hz3zskrjros5yzixpetffa Stephen Van Kampen-Lewis started topic PET style method of Catasetum potting- UPDATED in category General Discussion
  5. 20180723 201240 James Bixler started topic Eulophia andamanenis in category General Discussion

New Comments

  1. Image Carol Holdren commented on member plant Gga. Sharon Giles 'Alexandra's Avatar' by Matthew R Niemeier
  2. Image Carol Holdren commented on topic "Orchid not found in Orchids.Org" by Mary Lane
  3. 92f7c225 2490 4d3b 822c 2f4b8f30d6b8 Mary Lane commented on orchid Phal. Fred O'Donnell
  4. Iggy9 Sharie Heckaman commented on member plant Paph. Elfstone by Max white
  5. bob lewis commented on orchid Coel. monilirachis
  6. Bio Alex Maximiano commented on topic "Intergeneric name" by cello mazza yuwa
  7. Iggy9 Sharie Heckaman commented on member plant Brs. Eternal Wind by Max white
  8. 20180723 201240 James Bixler commented on topic "Eulophia andamanenis" by James Bixler
  9. Joanna Welcome-Martinez commented on article "Making CocoPeat From Coconut Husk" by Anu Dharmani
  10. 2016 11 03 Jeanne M Uzar commented on member plant Rlc. Green Dragoon 'Mendenhall' by Jeanne M Uzar