Once it became apparent that Argentina already had this fungus, the quarantine on U.S. blueberries was lifted. The fungus Phomopsis vacinni, commonly known as twig blight, occurs in all blueberry-producing areas of the United States and is controlled through the application of fungicides.
Twig blight causes the stems of plants to die and can result in reduced fruit production.
Argentina removed twig blight from its list of quarantine pathogens after U.S. representatives detected the fungus at blueberry plantations near Buenos Aires and further testing by Argentine officials confirmed its presence.