I got a bunch of tiny seedlings coming in soon and I don't have physan on hand, I was wondering if phyton 27 could be used on 1" Cattleya seedlings instead at a diluted strength.
Just because you have it doesn’t mean you should use it.
Rather than using a disinfectant, I recommend that you consider a probiotic instead.
Both can kill pathogens, but the disinfectant is topical and only effective while in use, whereas a probiotic will “infect” the plants and potting medium with microbes that will continue to fight pathogens and provide a boost to the plants going forward.