Fig trees can drop developing fruit for several reasons, and the timing of the drop matters.
What to check first
Review irrigation consistency, recent heat or weather stress, tree vigor and the variety. Most common garden figs do not require cross-pollination, but fruit-set requirements vary among fig types.
Look beyond one symptom
Inspect leaves for unusual mosaic patterns, mites or scale and check fruit for rot or insect damage. Avoid assuming that every dropped fig is caused by a disease.
California reference
UC IPM lists fig drop/no fruit among important environmental disorders of figs and also identifies pests and diseases that can affect fruit production.
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