Orange tree leaves fell off overnight
I have three citrus trees in my phoenix area yard. This morning I went out and the orange tree had dropped a layer of leaves on the ground, and when I shake the tree, more fall off. The leaves are still green, no sap, no black, no mold, just fallen off.
I fertilized my citrus with slow release fertilizer about 5 days ago, and did a deep watering after I applied the fertilizer.
The tree also just finished blossoming a few days ago.
Any ideas on what happened to my orange tree?