Orchid Q&A
* Air Conditioning
* Ansellia africana
* Aquarium Water
* Back Cutting
Black Growths
* Calanthe Culture
Catts in Hawaii
* Change of Environment
* 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.
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
Onc. Sharry Baby leaf showing spotting.
photo © 2004 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
Odontocidium Wildcat
* Oncidium Sharry Baby
* Orchid Honeydew
* Paphinia herrerae
* Paphiopedilum armeniacum
* Paphiopedilum delenatii
* Phaius Culture
Phalaenopsis Problem
* Phalaenopsis Spiking
Physurus herpysmoides
* Plant Sitter
* Rainwater Collection
* Redwood Bark
Re-rooting Plants
Spotted Oncidum Leaves
* Sticking Flowers
Storing Pollen
* The Larger the Better
Vanda Keiki
* Virus Question
|