Orchid Q&A

* Air Conditioning
* Ansellia africana
* Aquarium Water
* Brassavola Care
* Black Growths
* Brassavola Care
* Calanthe Culture
* Catts in Hawaii
* Change of Environment
* Coconut Husk
* Cymbidiella rhodocheila
* Culture of Alba Orchids
* Dehydration
* Dendrobium Care
* Dendrobium Repotting
* Dendrochilum magnum
* Dormancy
* Dry Conditions
* Epsom Salts
* Eulophia species
* Fertilizer Injector Dosage
* Flowering Vanilla
* Habenaria rhodocheila
* Holcoglossum kimballiana
* Inobulbum munificum
* Jewel Orchids
* Judging Orchids
* Leaf Color
* Leaf Residue
*
Leaftip Burn
* Liparis viridiflora




Q.

Spotted Oncidium Leaves
What causes black spots on oncidium leaves, especially Oncidium Sharry Baby? Brenda and Bill Dorsey

 

A.

While some oncidium types seem to be more genetically disposed to the black-leaf spotting, and Onc.Sharry Baby is definitely in this group, all of them may get it at one time or another. The experienced growers with whom I have spoken tend to think of it more as a cultural problem than anything. It seems to happen when the leaves are watered from above, especially with cold water, and the water bruises the tissue, leading to secondary bacterial or fungal infection which is the actual spotting. The solution, therefore, would be to keep water off the leaves. Ned Nash

Leaf of Oncidium Sharry Baby showing spotting. photo © 2006 Greg Allikas




Orchid Q&A

* Masdevallia coccinea
* Mastering Miltonias
* Maxillaria sophronitis
* Mealybug Infestation
* Meristemming Monopodials
* Missing Pollen
* Night Length
* Night Lights
* No Flowers
* Non-flowering Doritaenopsis
* Oncostele Wildcat
* Oncidium Sharry Baby
* Orchid Honeydew
* Paphinia herrerae
* Paphiopedilum armeniacum
* Paphiopedilum delenatii
*
Phaius Culture
* Phalaenopsis Problem
*
Phalaenopsis Spiking
* Plant Sitter
* Psychopsis papilio
* Rainwater Collection
* Redwood Bark
* Re-rooting Plants
* Spotted Oncidum Leaves
*
Sticking Flowers
* Storing Pollen
*
The Larger the Better
* Vanda Keiki
* Virus Question
* Volck Oil Spray