Lepanthes Leaf Tip Dieback

Any possibility of a fungal infection? Some of my thin-leaved Lepanthes like lucifer and dactylopetala get black spots which spread in a similar looking way to your photos. Although the fact that it’s starting at the tips suggests maybe it’s something else. In my case I’ve always been able to stop the spots from spreading with a few sprays of an antifungal called Ortiva.

 

For what it’s worth, the spray I mentioned is based on azoxystrobin.

 

You’re not alone Marni, but that’s because Physan is a topical disinfectant and infections are mostly systemic.

If a grower is experiencing infections, it is often a cultural issue that weakens the plant to the point of susceptibility. If the environment is rife with pathogens (they all are, to one degree or another), spraying Physan on the floor, walls, benches, etc., can be an excellent way to knock their population down, albeit only temporarily.

 

I grow this species with 70F days and 60F nights and haven't noticed any problems.