Black rot on Cattleya?

[SJF]

Hi,
This Cattleya (in the first four pictures) was in a four inch pot. I had to cut off the rest of the plant due to yellowing and softening of the p-bulbs. They turned dark and I cut those sections off. I sprayed what remained in the first four pictures with Physan 20. I cut if off and reported it in a much smaller pot in Orchiata. I thought I got all the diseased plant areas off. I love the flowers on this one and now what is left of it has yellowing and browning of the remaining pseudobulb. I sprayed it with Physan 20 last night. Would a systemic fungicide save it or is it a total goner now?

The last two pictures are of an orchid (different one than first pictures) that arrived from the grower with black pseudobulbs. I cut them all off and repotted it. This is what is left of that one. The leaves on one area turned yellow. This one, unlike the other, doesn't have soft pseudobulbs. Should I cut more off and treat it systemically?