BOTRYTIS: Time Lag to Its Visibility

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.

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It takes normally 10 to 12 hours to show on cattleya flowers. A80-110
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Botrytis Comments
BOTRYTIS: Cause and Cure An ever-present fungus; causes small round brown spots on flowers; decaying organic matter under the bench is a good source; best control is to keep water off the flowers; give good air circulation. A60-293; AH35; OD71-198 0
BOTRYTIS CINEREA: A Saprophyte Flourishes on decaying leaves, flowers, flower sheaths, leaf axils, organic debris on benches and floors, multiplies under conditions of excessive damp and cold; produces unsightly brown to black spots on flowers. OD67-49 0
BOTRYTIS: Controls A condition of high humidity over twelve hours causes the spores to sprout and causes death of cells; it sporulates off dying or dead organic matter; maintain night temperatures in mid- to upper-50's dF to dry the air; for details refer to OA80-140Botrytis cineraria is a fungus easily controlled by Benlate spray on plants and stems (it spots the flowers); plus cleanliness and good air movement. A82-690It is common in fall and spring when night temperatures are in the 50's dF with high humidity, when water condenses on the plants and flowers, where spores can germinate in four hours and penetrate, causing ugly spotting; stop the droplets from forming either by increasing air movement or by higher temperature. A83-343Spray Benlate three times at fortnightly intervals and monthly thereafter; clean up the greenhouse. OR81-101Use Benlate spray, occasionally alternated with Fore, or Dithane M-45; Ornalin, and Chipco 26019 are other recently introduced controls. AH86-70Use Captan WP at ltt... 0
BOTRYTIS: Flower Spotting Caused by Botrytis cinerea; occurs generally on cymbidiums, but also infects cattleyas and phalaenopsis; cool conditions favor infection (45 to 65 deg, F); clean culture is essential; to date no chemical control available; Termil fumigation partly successful. A68-227+ 0
BOTRYTIS: On Orchid Blossoms Fungus spores germinate during humid conditions, usually at night; there are six kinds that do this; a drop in humidity plus clear days will stop development; fans that produce gentle but definite air movement help. A65-536; on leaves. A64-58 0
BOTRYTIS: Petal Blight It can affect flowers in moist, cool and stagnant air; increase air movement and ventilation; spray with Benlate or Physan 20; illus. A66-558; A75-907 (illus); A77-436; cut off flowers. S204 0

New Topics

  1. Darrin Duling asked question Stenocoryne x Bifrenaria = Grex name? in category General Discussion
  2. Charles Vella started topic Orchid list Cold/Warm in category General Discussion
  3. Jan E Teitsworth asked question Can anyone identify this orchid? in category Oncidium Alliance
  4. Marianna Hynson asked question Need Help Identifying this Orchid in category General Discussion
  5. Sandi Block-Brezner asked question Brassocattleya hybrid? in category General Discussion

New Comments

  1. Charles Vella commented on topic "Orchid list Cold/Warm" by Charles Vella
  2. Sandi Block-Brezner commented on topic "Brassocattleya hybrid?" by Sandi Block-Brezner
  3. Robert H. Findlay commented on topic "looking for info about an unregistered cattleya" by bob lewis
  4. Robert H. Findlay commented on member plant Paph. Jessie by Robert H. Findlay
  5. james Hu commented on orchid Den. vannouhuysii
  6. Chase Hubbard commented on member plant Hknsa. Sogo Doll by Tom Kuligowski
  7. Colin Campbell commented on topic "Can anyone identify this orchid?" by Jan E Teitsworth
  8. Sharie Heckaman commented on member plant NEW HYBRID (Lc. Cornelia 'Floralia' x Lc. Moonlight Dream 'SVO Moonlight Kiss' AM/AOS) var. Compact by Vickie Seibert
  9. Carol Holdren commented on member plant Lc. Memory of PienPien Wei by Robert Rand
  10. Robert Rand commented on member plant Bc. Yellow Bird by John Small
  11. Sharie Heckaman commented on member plant Btcm. Hwuluduen Chameleon by Diana Sammy
  12. Sharie Heckaman commented on member plant (C. Leoloddiglossa var. coerulea 'SVO Baby Blue' x C.Interglossa aquinii var. coerulea 'SVO') 'SVO' by Joshua J Peterson
  13. Sandi Block-Brezner commented on topic "Need Help Identifying this Orchid" by Marianna Hynson
  14. Sandi Block-Brezner commented on member plant Bsn. Maikai var. Louise by Sandi Block-Brezner
  15. Vickie Seibert commented on member plant Phal. Ember 'Carmela' by Vickie Seibert
  16. John Small commented on member plant B. nodosa ''H&R' 4N x 'Mas Mejor'' by John Small
  17. Robert H. Findlay commented on topic "Parentage of RLC Memoria Emma Chen" by Dean Haas
  18. Dean Haas commented on article "Have Local Orchids to Sell or Trade?" by Sys Admin
  19. Eileen Pryor commented on member plant Den. chrysotoxum by Tom Kuligowski
  20. Gustavo da Silva commented on member plant Max. callichroma by Gustavo da Silva