Key Issues Perspective: Frogeye leaf spot increasing
Farmers are aware that frogeye leaf spot has increased, even if they are not aware of how strobilurin resistance is rapidly evolving since the first resistant strain of the disease was detected in Tennessee in 2010, Waddington said. Resistance is now in states on both sides of the Ohio River and Mississippi River.
Resistant or not, the disease is a problem. “Whether it is a more conducive environment, a more viral pathogen, cultural practices or all three, frogeye leaf spot is increasing,” he noted.
The disease likes hot and humid weather, and Hamlin explained that even during a drought hot and humid is still typical with heavy morning dews being enough to encourage disease development.
“A 25 percent average yield loss would be a conservative estimate, especially in our higher productive and higher risk areas. A 10 percent to 40 percent yield loss in different fields would not be unlikely across the Midsouth and into southern Illinois and Indiana,” Waddington said.
How wide spread evolving pathogens of frogeye leaf spot will spread is unknown. For more information Waddington can be reached by e-mail at firstname.lastname@example.org.