Begonia problem: brown spots from leaf center, please help!
I have a begonia dying. The plant has an important sentimental value to me, please help me to save it! Brown spot starts from a center of a leaf (underneath) around a leafstalk, then spreads around the leaf which eventually dries, while the leafstalk remains nice and healthy. I applied some fungicide but didn't seem to help. Now even small baby leaves get effected, starting to dry from the edges...
See pictures below. I will appreciate any help.
Here is a link that might be useful: