Hi. Along with problems with my phalaenopsis, I also have an oncidium I would appreciate advice on. This plant has a healthy root system and has a couple of new pseudobulbs. However, in the last couple of days I have noticed these brown spots appearing on the leaves along with some discolouration, particularly on one leaf which has taken on a mottled appearance. Any ideas what this could be and how to treat it?
Thank you in advance, Sarah