For some reason these dying tips on my Aerides keep coming back o 2 different leaves. You can see where I've cut the whatever this is off before, a clear inch or 2 from any visible sign down the leaf (then coated the tip in cinnamon powder to callous it). However it keeps travelling down the leaf.
If anyone knows what this is please tell me, I dread to think what will happen if it gets to the stem.