Lemon tree leaf issues

Why are my meyer lemons leaves suddenly looking discolored/patchy, and falling? Would this be overfertilzation/overwatering or a nutrient deficiency? The leaves are also looking burnt from the edges (not the tips) and now have small brown spots. When I originally…

Lemon tree leaf discoloration

Why are my Meyer lemons leaves suddenly looking patchy and falling? This is happening on the older leaves which used to be dark green but are now turning a lighter green. We are in Toronto, and the weather has been…