Orchid doctor

CROWN ROT: Characteristics

Ailments Orchid Doctor

by Robert M. Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin over 1 year ago.

Article Blog   Article Index
It usually affects phalaenopsis; also called Southern blight (which see); dip plant in Natriphene. S201
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: 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: 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. Raina Steiner asked question Ellison Onizuka in category General Discussion
  2. Paph hsinying jewel x paph hsying jewel september 09 2018 Adrienne Alexander asked question How to add a not-listed plant in category General Discussion
  3. Juan Martin Cabrejos asked question Any idea of this Cattleya? in category General Discussion
  4. Karl Olsen asked question Phalaenopsis Hope Star in category Phalaenopsis
  5. Brenda Sharpe asked question Dendrobium clavator in category General Discussion
New Comments
  1. Dsc 0747 Kathleen Kust commented on topic "Ellison Onizuka" by Raina Steiner
  2. Paph hsinying jewel x paph hsying jewel september 09 2018 Adrienne Alexander commented on topic "How to add a not-listed plant" by Adrienne Alexander
  3. Image Carol Holdren commented on member plant Rly. Raspberry Lemonade by Paul Keller
  4. Wbf4kvs Sys Admin commented on topic "Any idea of this Cattleya?" by Juan Martin Cabrejos
  5. Wbf4kvs Sys Admin commented on topic "Phalaenopsis Hope Star" by Karl Olsen
  6. Image Carol Holdren commented on topic "Dendrobium clavator" by Brenda Sharpe
  7. Greg Barne commented on topic "Using triacontanol on orchids" by Greg Barne
  8. Image Carol Holdren commented on member plant Phal. bellina by Andry Harmony
  9. Wbf4kvs Sys Admin commented on orchid Doc. teretifolia
  10. Wbf4kvs Sys Admin commented on orchid Den. clavator