orchids - Knowledgebase Question

odessa, Fl
Question by delmonicoa
August 3, 2009
I have a very larage orchid that has done very well for years. It was professionally repotted a few months ago and has been doing well. This past weekend I noticed the new growth is turning black. some of it has yellow areas with black areas. Help. Please help.

Thank you


Image
Answer from NGA
August 3, 2009

0

Blackened area on leaves may be caused by either sunburn or bacterial or fungal disease.

The appearance of black areas on the surface of the leaves, following a hot sunny day may be the result of sunburn. Exposure to direct mid-afternoon sunlight during the late spring through early fall will scorch the leaves of some orchids. Increase the shading or move the plant to a less sunny location.

If the blackened area increases in size, this is an indication of bacterial or fungal disease. Cut off the diseased area with a sharp, sterile tool(i.e., razor blade or knife). Then treat the plant with a fungicide like Physan 20.

Good luck with your orchid.

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