Erwinia, Fungus, Sunburn or Mineral Damage?

[orchidjunky]

Hi all,

I have noticed some brown "rot" along the tips and edges of some of my paph Michael Koopowitz and another hybrid I have. The pictures are below..

Pretty much this edge effect has been on these paphs for months.. I think the newest ones developed last summer. This paph has 1 or 2 edges like this that I know have been on it for 2-3 years now. Usually the tip or edge of the paph starts to get brown.. it's soft at first but after a couple of months it gets kinda hard/crispy.. although sometimes it just stays soft and brown too.

Mind you this plant has had this issue for at least 3 years and otherwise the fans look healthy even the ones with this weird brown edge on them My other paph has even flowered last month! At first I thought it could be Erwinia but doesn't Erwinia wipe out the plant or at least the whole leaf within days or at most within 2 weeks? Can Erwinia just be kept at bay if the plant is pretty much healthy?

The other thing I can think of is that it's some kind of mineral buildup issue since this mainly occurs on the edges and on 1-2 leaves its on the tip. The 2 plants that have this problem are in s/h??

I also have them in a window that receives lots of afternoon light so could this also be sun damage??

Any thoughts would be great.