I stopped regular watering giving my orchid only enough water as necessary to keep it alive over the next few weeks. You want to keep the moisture limited around the plant to prevent giving the fungus what it needs to survive but not so dry as to kill your plant.
Always try to save the pseudobulbs even if you have to cut it back. At the base there are quiescent buds from which new growth will emerge. In some cases cutting back the top of the bulb will activate the buds and promptly resulting in new growth.
In the meantime one of my Dendrobium
s, 'Burana Jade' became infected with the same disease. This was caused from water dripping into the center of the plant, from condensation on the roof of my greenhouse. I preformed the same procedure on the Dendrobium
as I had on the Cattleya
The damage was much greater since it was in the main crown of the pseudobulb. I treated the Dendrobium
by cutting away all the growth that was infected and treating the infected area with ground charcoal
in hopes that I would be able to save this pseudobulb and stop the disease from spreading to the other pseudobulbs that were growing in the pot.
After working with infected plants you need to take steps not to contaminate your healthy plants.
Be sure to wash your hands, sterilize all equipment used around the infected plants, and to remove any infected cuttings from the
. Remember this disease is contagious and can spread!
After discovering this infection I also started to spray my greenhouse
and all the other plants with a disinfectant
. I personally use RD-20 fungicide
and I really like it but there are many other brands, which can be equally suitable.
I also added another fan
to keep the air moving which helps the stagnant cool air and dries the leaves of the plants; the extra fan
has also helped reduce the condensation that forms in my winter greenhouse
Three weeks later I was happy to see I was able to save my beautiful Cattleya
. The cut had dried and I knew the infection had been stopped. Unfortunately I lost the pseudobulb on the Dendrobium
. The pseudobulb continued to decay and finally dried up.
I was successful stopping the disease from spreading to the other growths so the plant will be OK. At the first sign of problems you must react or in a very short time you could lose your orchid entire collection!