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Old 07-30-2015, 11:24 PM
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What is wrong with this phal?

In watering my orchids this morning I noticed one of the phals has something going wrong with it. Two leaves appear to be affected, on opposite sides of the plant. The patches appear to be dark areas, a bit of a grey/black tone. The discoloration is on both top and bottom of the affected leaf area. Any ideas what this is? Plant just finished blooming; and now this





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Old 07-31-2015, 07:19 AM
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It looks like Erwinia, a bacterial soft rot. Are the areas soft? The best first step is to cut off the leaves with a sharp flame-sterilized blade, making the cut in healthy green tissue between the rot and the stem. Don't cut near the watery dark tissue, that could spread the bacteria. Afterward, put the plant in a shaded location, don't water or spray for a couple of weeks and watch it closely to be sure the rot has not spread.

If all is clear after a couple weeks, you can carefully water the roots again. At that time, I would advise wiping the healthy leaves with a paper towel and isopropanol (rubbing alcohol), or with hydrogen peroxide. You should still keep an eye on it daily, or as much as possible, for a few weeks.

Act quickly, as this disease can spread fast. A plant treated as I've recommended should recover completely. BTW, providing your plant with some calcium will help the plant ward off disease in the future.
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Old 07-31-2015, 12:42 PM
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Yes the affected leaves are soft. I will separate this plant and do as you've suggested. Thanks!

I do occasionally add calcium carbonate when fertilizing. Will make sure to do so to increase the calcium with my plants.
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Old 08-05-2015, 02:48 PM
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I had problems like this now and then until I upped the amount of calcium. Good luck with the orchid!
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