Is it safe (or recommended) to water citrus leaves with a sprinkler in the direct sunlight? I have been told by some old gardeners that it is not good for the tree to water the leaves. . . period. . . and it can kill the tree if done in sun.
Citrus Leaves Watering in Hot Sun
Certified GKH Gardening Expert
The following articles should be of some help to you: https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
While it will not kill the tree, the water spots left on the foliage can act as a magnifying glass in the sun and cause burning or scorching of the foliage. It is generally better to water before the sun rises or after the sun has set.