I am a new Meyer Lemon tree owner. My trees' leaves have gradually yellowed, and started dropping. I thought they were under-watered, so I started watering more regularly, but that doesn't appear to have helped. I brought them inside as it started to get cool here about two weeks ago, and things got progressively worse. I cannot tell if they are nutrient deficient, overwatered, root rot, if they got too cold, or if they have another disease. I don't want to uproot/repot and risk stressing them further unless it's the right thing to do. Would someone be able to offer guidance on what issue they suspect based upon the images to help me determine the best course of action?
Thank you so much!