Bacterial Infection
 

Today while I was watering/checking my plants I noticed some black spotting on leaves of 4 plants. I contacted the vendor with pictures and was told it was a bacteria infection. What is the best thing to use Physon20 or the original formula of Listerine.

Thanks much

Dennis

If you have the Physan, I would suggest using that. If you have to order it and wait, then I would suggest getting the brown Listerine and using that. Do it early in the day so the leaves dry. Make sure you always have good air movement around the plants which will help prevent it.

What type of orchids have the spots? Can you post photos of them? Oncidiums and Zygos tend to spot quite easily and can be quite common.

Not all black spots are bacterial. Here is a guide to help you determine whether you have a fungal or bacterial disease: Orchid Diseases

Here is a guide to selecting the right treatment for a specific disease: http://www.staugorchidsociety.org/PD...idDiseases.pdf

Finally, some black spotting may be due to environmental or cultural problems: Orchid Environmental Damage

The Listerine may help until you can acquire the right treatment for the disease your plants have, or give you some peace of mind until environmental problems can be corrected.