Hi,
My dwarf lemon in a pot has developed these brown spots on the leaves, rapidly getting worse, and I wondered if anyone else might be able to diagnose? The spots are dry, don't appear to be raised, seem to affect both old and new leaves, and I can't see any obvious insects, mites etc. I've been feeding it every few weeks with a potassium-rich fertiliser, a light watering every day (? too much), and it sits in a sunny courtyard - it's been in this same position for 6 years but these spots have only shown up in the last 6 months or so. Any ideas... disease? pests? nutrition? sunburn?... any advice much appreciated!!