A plant pathologist says tar spot remains the number one concern corn growers have going into the 2023 growing season.
Dr. Damen Smith with the University of Wisconsin tells Brownfield tar spot can be a sneaky yield robber, and farmers want to know the best time to apply a fungicide. “We know that the most consistent timing is really around that start of tassel to about the R3 or milk growth stage. That’s really your window of opportunity.”
Smith says farmers should keep track of when they sprayed and consider a possible second fungicide application if tar spot starts to take off.