brown areas on the leaves

[nutgirl]

This is a Burrageara "Stefan Isler" that I've had for about 6 mos. About a month ago I noticed the tips of the leaves were turning brown and there were brown areas on the leaves. I cut them off.

The picture shows a cut leaf with new brown areas forming. I don't know if it's a reaction to the pruning or whatever this is is spreading.

The uncut leaf shows a brown area like the ones I noticed previously. It is dark brown with lighter areas around the edge. It appears to be spreading.

Any ideas? Treatments?

Maureen