Mature Sweet Lemon Trees Dying

Question

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Answer 1

Have they been getting regular irrigation? If it isn't water, it could be disease or insects. These articles should help pinpoint the problem: https://www.gardeningknowhow.com/edible/fruits/lemons/common-lemon-tree-diseases.htm https://www.gardeningknowhow.com/edible/fruits/lemons/lemon-tree-leaves-turn-yellow.htm https://www.gardeningknowhow.com/edible/fruits/lemons/sweet-lemon-information.htm https://www.gardeningknowhow.com/edible/fruits/lemons/pests-of-lemon-trees.htm