Also, commercial citrus is grown on raised beds to insure excellent drainage because excess water can easily seriously damage trees. Very often, in the home landscape, citrus trees receive far too much water from sprinklers. If you have citrus, only young trees need added water until they are established. Thereafter, only in drought should citrus need or want added water. Excess water also produces dry fruit.
Excess water can promote fungus and root diseases.
You should shut off sprinklers that might apply water to your citrus trees. Also, never allow lawn grasses or any other plants to grow at the base of citrus trees. This is because fungus is the potential lethal enemy. A - The grass will probably die. Grass and citrus are totally incompatible .