Fields suffering from “windrow disease,” as Bruce Anderson calls it, are a trial for hay growers.
"Windrow disease is the name I give to the striped appearance in fields where alfalfa windrows remained so long that regrowth was delayed," explains the University of Nebraska Extension forage specialist. "Usually it’s due to rained-on hay, but also sometimes to insects.
“Weeds often invade, requiring spraying to maintain quality and protect stands,” he explains. “And during the next growth period, plants that were not smothered regrow rapidly, while plants underneath the windrow suffer delays.”
As a result, parts of the field will begin to bloom, while windrow-stressed plants are still short and tender. Hay farmers are left to wonder when they should take the next crop.