We have about 20 large ficus trees in our yard, about 8 years old. a few have leaves turning yellow & falling off. one has died so far. We live in Southern Calif.
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2 Answers

after the sun goes down mix 1 teasp liquid hand soap w 1 qt water mix & spray that tree...................................may need to repeat...................................in the fall when all leaves have fallen spray dormant oil according to directions.
by (150k points)
Ficus trees are very tempermental and don't like change.  I know Southern California has had lots of unusual weather lately (the last 30 days) and some of the trees could be less hardy than others therefore showing signs of a problem.

Check for pests.  Check for red spider mites using a piece of white paper held under a branch.  Tap the branch and see if any tiny, tiny red specks show up on the paper.

Are the leaves sticky?  This could be a sign of aphids/ants.   I doubt that it is borers.

How are they being watered?  If by drip are any of the lines plugged up?

County Extension will be able to diagnose the problem if you take in a branch of yellowing leaves.  Then you will know bhow to treat the problem.

Liquid hand soap is not the answer to everything.
by (13.4k points)

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