Lc. yellowing at the petiole?
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Black patterned spotting on leaf and subsequent yellowing on Phal. Mini Mark Lc. yellowing at the petiole?
 
 
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Old 10-16-2024, 07:54 AM
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Lc. yellowing at the petiole? Male
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Physan is not an insecticide.

What I see is not “yellowing of the petiole” but rotting of the pseudobulbs. I suspect a bacterial infection has somehow been introduced.

I would remove the two yellowing bulbs, then treat the plant with a copper-based bactericide/fungicide (Physan is a topical disinfectant, not systemic like copper compounds.)
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