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yellow leaves on Rose of Sharon

I have 6 tree form Rose of Sharons that have been beautiful all summer until now. They get full sun, well drained soil, and have been fertilized. Have been abundant with blooms, but now all the leaves are turning yellow and falling off! I have sprayed with a combination insect/disease control product and an iron solution that is a hose end feeder but leaves still turning yellow and falling off. Help!
Submitted by BHGPhotoContest

Yellowing leaves are an indication of stress. The stress could be caused by any number of things: underwatering, overwatering, phytotoxicity from spray solution, or even disease or insect attack.  If diseases or insects are involved, you'll usually be able to see additional signs such as spots on the leaves or stickiness from insect feeding.

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