ROOT ROT: Rhizoctonia Solani

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin about 5 years ago.

Article Blog   Article Index
Brown rot usually confined to roots, sometimes enters the rhizome; the decline of plant is gradual; cut off all affected parts; drench with Benlate at 1 ttpg. or Banrot at 1 ttpg. if Phytophora cactorum or Pythium ultimum are also present. AH17

It attacks plants and seedlings in a wide range of genera, usually growing in bark or tree fern; it is a brown rot which sometimes extends into the rhizome; in mature plants the decline is gradual; to cure it, cut off the diseased roots, etc., drench the plant in benomyl (Benlate 50W) solution at lttpg. AH86-72

Most destructive in Florida; mycelium and sclerotia of the fungus attacks roots and rhizomes; if unchecked it advances up the stems and into the leaves; the decline of the plant may be gradual; dip the plant in benomyl for five minutes, at 1 ttpg.; or, remove the plant and dip in ferbam for five minutes at 2 ttpg.; completely rootless plants can be dipped in Terraclor 75WP. BU39

Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading Root Rot

Root Rot Comments
ROOT ROT: Control in Cymbidiums Dexon gives good control of rot caused by water molds; is moderately toxic to humans; Benlate and Physan may have good potential; Shell Drench 345 fungicide is commonly recommended. C72-83 0
ROOT ROT: In Seedling Flats and Pots Use Shell Drench #345 added to the normal feed solution; it is toxic, so handle with care; is also expensive but a little goes a long way: 2.5 fluid ounces in a gal. of water is the STOCK solution; for a drench application use only one part of the stock solution to 500 parts water, or 1.5 teaspoons to a gal. of water. OD69-26 0
ROOT ROT: Pellicularia Filamentosa A fungus, causes brown rot; can kill small seedlings rapidly; a brown mycelium infects the roots and other parts; soak in Natriphene at 1:2,000, or treat with Zineb or Tersan; repot clean. N317; use Terraclor, Tersan or Natriphene. S199A most destructive disease in Florida; young and mature plants of many genera are attacked; those growing in old and water-logged media are most often attacked; it is worldwide; a brown mycelium attacks roots and rhizomes; mature plants may decline gradually; remove plants, dip in Terrachlor for five minutes at 1.5 to 2 ttpg.; repot clean. B29; BU39 (Rhizoctonia solani) 0
ROOT ROT: Rhizoctonia Control: use Captan at 1 ttpg. as a spray or Terraclor at 1 ttpg. as a drench; also, Chinosol, oxyquinolate benzoate, or sodium-o-phenylphenate (Natriphene) in a 1:2,000 solution; drench. P71(2)-24 0
ROOT ROT: Various Fungi Cause it The first visible symptoms may be a yellowing of the pseudobulbs from the base upwards; cut off all rotted roots and infected sections of the rhizome together with affected parts; soak the good parts in Natriphene; then treat with Tersan. A66-401; A73-814 0

New Topics

  1. Robert Stagner asked question cattleya mossiae Willowbrook in category General Discussion
  2. Judith Pariseau asked question Paphiopedilum culture differences in category Paph Alliance
  3. Marc Lefkowitz asked question Bulbophyllum in category Bulbophyllums
  4. Tony Borowiecki asked question Can a Bealleara re-flower in category Oncidium Alliance
  5. Tony Borowiecki asked question Re-flowering Orchids in category Dendrobiums

New Comments

  1. Robert H. Findlay commented on member plant Oncidium Sherry Baby by Luesa Estrada
  2. Judy Bailey commented on topic "Paphiopedilum culture differences " by Judith Pariseau
  3. David Hickman commented on topic "Mystery Orchid" by David Hickman
  4. Carol Holdren commented on topic "Bulbophyllum " by Marc Lefkowitz
  5. Carol Holdren commented on topic "Can a Bealleara re-flower" by Tony Borowiecki
  6. Carol Holdren commented on topic "How to care for my new orchid" by Sylvia Spence
  7. Bodil Bruus commented on member plant Ctt. Mrs. W. N. Elkins var. coerulea by Linda Thorne
  8. Jan E Teitsworth commented on topic "Can anyone identify this orchid?" by Jan E Teitsworth
  9. Carol Holdren commented on topic "Brassolaeliocattleyamaianh " by Kim Loan T Nguyen
  10. David garcia commented on member plant Myrmecophilia tibicinis stromburgkia trumpet player by David garcia
  11. Carol Holdren commented on member plant Bc. Maikai by William Gorski
  12. Joe L commented on topic "ID of this Oncidium? " by Joe L
  13. Robert H. Findlay commented on member plant Sngl. macloughlinii by Nicholas Stein
  14. Carol Holdren commented on topic "Name of this orchid" by ETHEL HAY
  15. Carol Holdren commented on topic "Pot. Hawaiian prominence america red orchid" by Paula Milano
  16. Edward Zapata commented on topic "Lady Bug or dangerous bug" by John Small
  17. Wyatt Parker commented on member plant Zygopetalum var. Big Red One by Wyatt Parker
  18. Carol Holdren commented on member plant Renantanda Sunrise 'Prasongs' by Andrew Chan
  19. Carol Holdren commented on topic "Dendrobium No I’d. HELP!" by Rae Walker
  20. Carol Holdren commented on article "CATTLEYAS: Control of Blooming Time" by Robert M. [Bert] Hamilton (Compiler)