A disease that has troubled white button mushroom growers for more than 100 years is far more complicated than scientists previously believed. Researchers at the University of Florida have discovered that the problem involves a surprisingly diverse collection of harmful bacteria, rather than a single pathogen. The finding could help explain why the disease has been so difficult to control and lead to more effective ways to protect mushroom crops.
The discovery comes from a University of Florida study investigating bacterial blotch, a persistent disease that damages white button mushrooms and causes significant financial losses for growers. White button mushrooms are a valuable specialty crop and a familiar ingredient in everything from salads and appetizers to everyday meals. Rich in nutrients and valued for their versatility, they are often promoted as an example of the "food is medicine" concept, which emphasizes the role of nutritious foods in supporting good health.
Their nutritional benefits make them an important part of many healthy diets. Despite their popularity, these mushrooms face a longstanding problem that can make entire portions of a harvest difficult or impossible to sell. A Century-Old Mushroom Disease With Hidden Culprits Bacterial blotch causes brown or yellow discoloration on mushroom surfaces, damaging their appearance and reducing their commercial value.
The disease can also lower crop yields and shorten shelf life, making it a costly challenge for mushroom farms across the United States. Adding to the difficulty, visible symptoms sometimes develop only after mushrooms have been shipped to grocery stores or purchased by consumers. This delayed appearance makes the disease especially troublesome for growers trying to ensure consistent product quality.
For many years, scientists primarily associated bacterial blotch with a single disease-causing bacterial pathogen. However, researchers at the University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) have now found that the disease involves a much more complex collection of pathogenic bacteria. These microorganisms can thrive in the carefully controlled, humid indoor environments used for commercial mushroom cultivation.
Because several bacterial species may contribute to the same disease, methods designed to target a single pathogen may not be sufficient. "For years, the industry has struggled with treatments that provide inconsistent results against bacterial blotch," said Samuel Martins, co-author and assistant professor in the UF/IFAS Department of Plant Pathology. "As part of a separate $7 million U.S.
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