My lemon tree has all of a sudden started showing signs of disease. It does have something that looks like aphids on it but they have been there for months and just all of a sudden the leaves are getting brown spots, dropping, and dropping. Could this be from the aphids?
Indoor Meyer Lemon
Certified GKH Gardening Expert
This could definitely be aphids. You will want to spray it with neem oil in the early morning once every few days until there is no more sign of infection. This link will take you to some articles that will help you to making your own pest control: https://www.gardeningknowhow.com/special/organic/