Lc. yellowing at the petiole?

[Pynn]

My Lc. Santa Barbara Sunset had some white mold looking stuff growing at the base of the canes on the sheaths. I guess it might have been too humid? I'm growing outdoors in my lenai in Central Florida zone 10. I peeled off the sheaths and treated with Physan, then repotted into something with a bit more airflow. All of a sudden, every leaf is yellowing at the connection to the pseudobulb, dropping, then the pseudobulbs are turning yellow. Does anyone have any insight? Thanks so much!