GREENFIELD, Calif.—When Agustin Espinoza Jaramillo shuffles to the doctor who treats his prostate cancer, he says he thinks about the three decades he spent applying pesticides to the fields that surround this farming town. Jaramillo, 72 years old, long knew some pest-killing chemicals have been linked to health problems including cancer. Even so, his own diagnosis came as a surprise.

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Persons: Agustin Espinoza Jaramillo shuffles Organizations: — Locations: GREENFIELD, Calif, Jaramillo