In a year when global harvests need to be excellent to ease the threat of pervasive food shortages, evidence is mounting that they will be average at best. Some farmers are starting to fear disaster.

American corn and soybean farmers are suffering from too much rain, while Australian wheat farmers have been plagued by drought.

At a moment when the United States’ corn should be flourishing, one plant in 10 has not even emerged from the ground, the Agriculture Department said Monday. Because corn planted late is more sensitive to heat damage in high summer, every day’s delay practically guarantees a lower yield at harvest.

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