I recently posted about a pepper plant that I got from the local market. Lately, I have noticed circular whitish-brown spots on a lot of the leaves and this seems to be gradually spreading to other healthier parts of the plant. I've pruned the plant to get rid of the affected parts and kept it away from all my other peppers but it seems that the pest or infection is coming back.
Any idea what this might be and how I can treat it? I'm just worried about this ravaging my whole pepper plants - got some 20 other varieties in another location.
Thanks for all the help.