Some of the leaves on my 7-year-old grapefruit tree are turning yellow and others have little brown dots on them. Help.
Certified GKH Gardening Expert
While leaf yellowing often signals iron or nitrogen deficiencies, the brown dots may indicate a fungus of some type. You can treat the tree with neem oil, often sold as fruit tree spray, to help with this.
This article will have some other reasons for yellowing leaves: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm