Black spot on Cattleya

[WaterWitchin]

I’ve read, not done, that an extra boost of calcium in spring wheat they start a lot of new growth can help. I think it was on AOS website but not sure. Might check it out.

[Roberta]

Jeff -
City water or RO? If they are getting city water (and Catts do just fine with it in my experience), there's no shortage of calcium where you live.

[SouthPark]

Jeff - try hitting that 'infection' with something like agri-fos.

[Jeff214]

I use city water for nearly all my orchids. I haven't heard them complain (that I know of).

I'll try a couple more fungicides (like agri-fos) and see. I'm tired of loosing spikes on this one... thanks!!

[Nexogen]

Images of Calcium Deficiency on Orchids

https://staugorchidsociety.org/PDF/C...ySueBottom.pdf


https://staugorchidsociety.org/PDF/R...Deficiency.pdf

[WaterWitchin]

I'm backing off on saying it's black rot, after going back and re-reading your original post. Have you checked your water's pH?