Bitter Harvest dramatizes a real and grim agricultural disaster: the Michigan PBB contamination incident. In the film (based on Frederic and Sandra Halbert's 1978 book), young dairy farmer Ned De Vries watches his cattle sicken while state veterinarians insist the problem is on the farm. A quiet but crucial laboratory mistake—a gas chromatograph run accidentally left to print all night—yields a single, overlooked blip that becomes the key. With the help of a sympathetic lab technician and Dr. Morton Freeman, that blip is identified as polybrominated biphenyl (PBB), a Firemaster flame retardant that had been stored in sacks indistinguishable from the protein additive used in animal feed at a Michigan mill near Battle Creek. The identical coloring and pallet placement make the accidental switch tragically easy.
As the film unfolds the bureaucratic arc is as damaging as the chemical: initial skepticism from Michigan Farm Bureau veterinarians and slow-moving official responses strand farmers and families in uncertainty. PBB, shown in the film to accumulate in body fat, is passed through milk and meat—De Vries' wife cannot breastfeed because of the risk of passing the contaminant to her baby—and the long-term human health impacts are left ominously unresolved. The story culminates in heartbreaking, bureaucratic remedy: a year after the outbreak De Vries' entire herd is rounded up, gunned and buried in a deep pit, bulldozed over in a single, grim act meant to contain contamination but also a wrenching symbol of loss. Bitter Harvest aired on NBC on May 4, 1981, earned positive reviews and four Emmy nominations, and stands as a cinematic chronicle of industrial error, official inertia, and the devastating social fallout when a toxic product enters the food chain.
