Cottonball, a disease caused by the fungus
Monilinia oxycocci, fills berries with a cotton-like fungus and makes them unmarketable. It is an economically important disease on many cranberry marshes in Wisconsin. Typically, 2 to 10% of the fruit in diseased beds is infected; if left unchecked the amount can exceed 40%. Learn how to spot and control for this cranberry disease using this handy fact sheet (4 pages).