March 20, 2023

Tar spot a rising concern for growers

INDIANAPOLIS — In the coming months, growers should work on a plan for tackling tar spot, experts at Corteva Agriscience advise.

Specific hybrids have shown strong resistance to the typical yield losses attributed to tar spot, but growers should also plan on in-season fungicide applications to help ensure protection.

On-farm fungicide trials conducted in 2021 appeared to confirm concerns that the rapid re-infection rate of tar spot would make it difficult to control with a single-pass fungicide treatment.

Precise application timing was often critical. Two applications were necessary in some cases to provide adequate tar spot control.

Learn more about tar spot at

Erica Quinlan

Erica Quinlan

Field Editor