Research on fungus spread could help growers predict, monitor and control powdery mildew disease affecting blueberries.
A new North Carolina State University study pinpoints the worldwide spread of a fungus that taints blueberry plants with powdery mildew, a disease that reduces blueberry yield and encourages the use of fungicides to combat disease spread. The findings could help blueberry growers predict, monitor and control the spread of powdery mildew., has in the last 12 years or so spread from its point of origin in the eastern United States to multiple continents.
"There are other closely related powdery mildews that affect plants like wild berries or eucalyptus, but these are genetically different from the ones spreading across the world on blueberries," Bradshaw said. The study showed that the disease originated in the eastern United States and was set loose globally in two different introductions. One strain offound its way to China, Mexico and California, while a different strain wound up in Morocco, Peru and Portugal. Bradshaw thinks humans are responsible for the spread as nursery plants traveled to foreign shores.
Finally, the study provides some early warning signals to important blueberry producing areas, like the U.S. Pacific Northwest. Conditions there are ripe for powdery mildew to take hold and spread, but the disease has not found its way there yet.
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