RUSTS: Sphenosphora Sp. and Uredo Sp.

Ailments Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin about 4 years ago.

Article Blog   Article Index
They are usually orange, brown rusty spots found on many genera; cut it off and burn the pieces of infected leaves, or better still, destroy the whole plant; spray with Ferbam or Zineb; Plantvax-75W may be successful. "AH32+
Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading Rusts

Rusts Comments
RUSTS: Controls Captan and Ferbam are not used with official approval in combatting them, and to those can be added Fore/ Dithane for use on dendrobiums; some of the better ones, not yet legal are Bayleton, Triforine/Funginex and they might be worth looking for. AH86-70 0
RUSTS: Frequently Found in the Wild Some imported plants may carry rust fungi; can be seen as masses of yellow to orange spores; treat with copper containing fungicide, such as Bordeaux mixture or Tersan. A66-558; A73-815; S203; copper sulfate is very toxic to plants. OWD 0
RUSTS: On Leaves of Several Genera Rust disease is caused by a fungus, the appearance of rust on plants may also be caused by unstable iron in the water supply; a specimen leaf should be checked by the Dept. of Agriculture; address given. A73-615 0
RUSTS: Sphenosphora Kevorkianii, Etc. Found on Epid. tampense; small orange areas or pustules under the leaves; they turn black, are sometimes concentric; only the leaves are attacked; cut them off; try Plantvax-75W, or ferbam, or captan. B15; BU15 0
RUSTS: Sphenosphora Mera Attacks various orchids; on cycnoches it is found under the leaves as tiny raised cinnamon brown areas; when ruptured they spread spores; remove and burn plants; or spray with ferbam, or Plantvax 75W at 2% ttpg, monthly. B17; BU18 0
RUSTS: Sphenospora Saphena Some oncidiums in Florida have been infected; show tiny raised orange areas under leaves; aging, the pustules become dark brown; remove and destroy all infected plants; spray surrounding ones with ferbam; spray small plants with Plantvax 75W monthly at 2% ttpg. BU17 0
RUSTS: Uredo Behnickiana, Etc. First seen on Phaius grandifolius; no control once it is established; destroy all infected plants; try Plantvax 75W at 2.5 ttpg.; varying results have been reported with it. B13; BU14+ 0
RUSTS: Uredo Epidendri Infrequently found in Florida on Oncid. cavendishianum; shows raised brown pustules with reddish border, first on the underside of leaves; destroy all plants showing infection; protectively spray other plants with ferbam at 1.5 ttpg weekly or Plantvax 75W at 2.5 ttpg.every thirty days. B16, BU17 0
RUSTS: Uredo Nigropunctata Occurs infrequently in Florida; it forms conspicuous irregular orange and black pustules on both surfaces of the leaves; cut them off and destroy them; try ferbam at 1.5 ttpg. weekly, or Plantvax 75W at 2.5 ttpg. twice, 30 days apart, BU19 0
RUSTS: Uredo Oncidii Many plants are attacked; it produces powdery masses of yellow to yellow-orange spores; spreads easily; weakens plants; treat with a copper-containing fungicide, or Tersan; N319 (as Hemeleia americana); destroy the plant; spray all others with ferbam. BU61 0

New Topics

  1. John Small asked question Paper Wasp? in category General Discussion
  2. Sharie Heckaman started topic Photos of plants in category General Discussion
  3. Roberto Lizama started topic Orchid identification in category General Discussion
  4. Roberto Lizama asked question Help to idenficate this orchid in category General Discussion
  5. William Gorski asked question Dendrobium Identification in category General Discussion

New Comments

  1. Carol Holdren commented on member plant Phal. buyssoniana by Robert Oceans
  2. Mary Lane commented on member plant Fdk. After Dark 'SVO Black Pearl FCC/AOS; CCE/AOS' by William Gorski
  3. John Small commented on topic "Paper Wasp?" by John Small
  4. Lauren Hutchison commented on topic "Help to idenficate this orchid" by Roberto Lizama
  5. Carol Holdren commented on member plant Phal. Timothy Christopher by Vickie Seibert
  6. Carol Holdren commented on topic "Photos of plants " by Sharie Heckaman
  7. Carol Holdren commented on member plant C. Ronald Fonseca var. Compact 'SVO' by Vickie Seibert
  8. Roberto Lizama commented on member plant Ntl. bicolor by Roberto Lizama
  9. Carol Holdren commented on member plant Gra. stapeliiflora var. Waki by Melvin Waki
  10. Vickie Seibert commented on member plant Phal. Anna-Larati Soekardi 'Wilson' by Vickie Seibert
  11. Carol Holdren commented on member plant Rrm. Spunky by Melvin Waki
  12. Charles Vella commented on topic "Orchid list Cold/Warm" by Charles Vella
  13. Sandi Block-Brezner commented on topic "Brassocattleya hybrid?" by Sandi Block-Brezner
  14. Robert H. Findlay commented on topic "looking for info about an unregistered cattleya" by bob lewis
  15. james Hu commented on orchid Den. vannouhuysii
  16. Chase Hubbard commented on member plant Hknsa. Sogo Doll by Tom Kuligowski
  17. Colin Campbell commented on topic "Can anyone identify this orchid?" by Jan E Teitsworth
  18. Carol Holdren commented on member plant Lc. Memory of PienPien Wei by Robert Rand
  19. Robert Rand commented on member plant Bc. Yellow Bird by John Small
  20. Sharie Heckaman commented on member plant Btcm. Hwuluduen Chameleon by Diana Sammy