So sorry. I have some orchids now with leaf tips that keep yellowing and browning. A couple of Catts I separated b/c they have some sort of rot. I keep trimming the leaves on the dialaelia, dusting the cut portion with cinnamon and it keeps coming back. I cut way into the green area of the leaf with flames snippers...I don't get it
Could be anthracnose. Look into some Cleary's 3336.