Pythium and botrytis are very common problems you might encounter when you try P. zonale from cuttings. I would try soaking the cuttings in a 10:1 solution of water:3% H2O2 (hydrogen peroxide) or unscented household bleach before a rinse & sticking them in a sterile medium. Try a 50/50 mix of perlite & chopped/milled sphagnum moss (not peat) for very good results. If you have it, a liberal spritz of a fungicide with Tebuconazole after sticking the cuttings will go a long way toward controlling things fungal. Bayer makes a few products that contain this fungicide for over the counter, but it's best if you avoid the products that say 2-in-1 or 3-in-1 and stick to only the fungicide. It's VERY good for things ornamental ...... it's not for food stuffs. It's not particularly noxious, but if you use it, PLEASE read the label carefully and follow directions.

You can reduce transpirational loss by removing some larger leaves from the cuttings and/or by cutting leaves in half across the veins. Tenting loosely to keep humidity high is very helpful and a very bright spot out of direct sun is best. Clean (sterile) tools and clean hands, as well as general cleanliness in your propagation area are also important.

Al