black regions on cattleya roots/rhizome
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  #1  
Old 08-29-2021, 04:41 AM
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black regions on cattleya roots/rhizome
Default black regions on cattleya roots/rhizome

I recently received a Rlc. Hawaiian Lighting Fiesta which I repotted yesterday to coincide with new root growth. Upon unpotting I noticed hard, black areas on the older parts of the rhizome, going up the base of the oldest non-withered back bulb, and above the soil line on some old roots (I had assumed they were just dirty). The plant had been in a a mix of bark, soil, and pebbles and had not been repotted by the previous owner. The bark was brittle and seemed degraded.

I clipped rhizome just below the oldest pseudobulb that still has a leaf, roughly where the dark area stopped on the rhizome (removing two withered bulbs and the green bulb with spreading black). I did not removed all of the old roots that have black near their base because they seemed firm and otherwise healthy. I sprayed the rhizome and old roots with H2O2, rinsed after a minute, dried, covered the cut with cinnamon, and repotted the plant into a ventilated terracotta pot with medium bark, keeping the dark areas on the remaining old roots partly exposed.

My very inexperienced guess at a culprit is Rhizoctonia, but I felt it prudent to check here for advice before advancing to a targeted treatment for the remaining old roots. Am I correct in my diagnosis? If so, what are the thoughts on treating the problem with thiophanate (cleary's/thiomyl) vs. chlorothalonil (daconil)? From the treatment chart linked in the sticky daconil seems easier, but might the thiomyl be more effective due to mobility?
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  #2  
Old 08-29-2021, 05:48 AM
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black regions on cattleya roots/rhizome
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Sorry can't help with the questions, only that with cases like these 99% of the time there isn't an issue.

If there is an issue then so be it but I don't think you have an issue. Only if a part of the plant turns mushy do you have a serious problem.

I see no mushyness whatsoever,
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Old 08-29-2021, 02:30 PM
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Welcome to the Orchid Board!

Old Cattleya pseudobulbs often turn black like that. It doesn't affect the active part.
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Old 08-29-2021, 05:56 PM
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That's good to hear! I'll keep an eye on it but hold off on further treatment. Thanks for the help!
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