   Evan Chreitzberg's house in Plant City sank three feet in
January; his insurers declared the condemned property a total
loss. Barry Newman/ The Wall Street Journal   Sinkhole-insurance
claims, anyway, have gone way up. The claims are followed by
insurance surveyors who tow little wagons equipped with ground-
penetrating radar—and by fights over whether a house has a
sinkhole or something vague and uninsurable, like "subsidence."
Too much rain provokes sinkholes. So does too little rain. In
this town, a sinkhole crisis has been set off by strawberries.
Plant City, pop. 32,000, is Florida's strawberry capital. During
a record cold snap this past winter, farmers pumped millions of
gallons of water onto their strawberries to keep them warm.
Cavities in the limestone aquifer emptied, weakened and gave
way.  On Jan. 11, the day before Haiti's earthquake, Cindy
Kersey was in her kitchen making pesto. She heard a "pop." It
sounded like ice breaking up. She went outside. No ice. She
heard a "bang" and found a crac