Jeff Dolan's tomatoes in San Joaquin Valley are ripening and ready to pick this week. But that puts him in a pickle.

In California, harvest time is arriving just as tomato growers in other parts of the U.S. are reeling from a sudden supply glut that is pushing the price for fresh tomatoes sharply lower. Florida farmers who fetched more than $30 a few months ago for a 25-pound box of round, fresh field-grown tomatoes, also known as slicer tomatoes, are now getting $5 or less.

The abundant crop is rooted in last winter's cold weather in Florida, which delayed the development of tomato plants. The overdue harvest hit the market in May just as DiMare Co., where Mr. Dolan oversees California field operations, was picking tomatoes near Palm Springs.

"Prices dropped like a rock" after the harvest began, he says. As a result, at least 40% of the revenue that DiMare hoped to get from that part of California could vanish.

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