My orange tree is losing its leaves. It was extremely hot last summer (I live in Tucson) with no rain. The crop was smaller than usual this year and we had lots and lots of rain this winter and colder than usual. There seems to be lots of blossoms but the leaves are falling.
Orange Tree Leaves Falling
Certified GKH Gardening Expert
Citrus trees are funny like that. They will hold onto leaves while not getting enough water but will drop their leaves after a dry period when the water returns. The tree can recover though. Here is more information: