Tar spot has now been confirmed in Michigan.
Michigan State University plant pathologist Marty Chilvers says low levels have been reported in the southeastern part of the state in Monroe County.
“I’m completely not surprised, given that we’ve had rainfall events, at least the past three weeks now, if not a little bit longer,” he says.
Chilvers says research has found the timing of fungicides is most effective once corn starts to tassel rather than in earlier vegetative stages.
