Brown Spots on Paph Leaves

[Sebo]

Hi all,

A few days ago I noticed these brown splotches popping up on the underside of the leaves on one of my rothschildianum hybrids. Anyone have any idea what might be causing it or what it is?

 

[Ozpaph]

i wonder if its insect damage with secondary infection.

 

[Sebo]

i wonder if its insect damage with secondary infection.

Well I considered that but I haven’t seen a single pest on this particular paph yet

 

[Happypaphy7]

Fungal infection.
I had something similar on my roth hybrid. I applied dragons blood on the entire leaf (only the underside of the leaf was affected) and never seen it again.

 

[gego]

If it has sunken, probable cause is fert toxicity. What did you apply prior to that?