Selecting the right hybrids to defend against tar spot
USA
October 17, 2022
Tar spot has been impacting many fields throughout the United States. Just last year, it slashed U.S. corn yields by about 231.3 million bushels – which was more damage than any other disease. While the exact impact on this year’s crop is still unknown, it’s clear that tar spot does not appear to be going away any time soon. For growers, it’s important to be proactive and select the right hybrids now to help combat tar spot in 2023.
“Hybrid selection is the No. 1 thing growers should be doing right now for next year,” said Ryan Bates, Pioneer Field Agronomist in Wisconsin.
It is important to prioritize hybrids with genetic resistance to tar spot, as it appears to mitigate symptoms and yield loss more effectively than either cultural or chemical management practices. Check hybrid tolerance ratings for hybrids that will work in your field and work against tar spot and find a balance between yield and resistance.
Earlier this year Pioneer launched tar spot ratings for their corn lineup. It is recommended that producers review their hybrid selections with their local sales representatives to determine which hybrids and tar spot ratings are best suited for their farms. Reviewing will also help develop a management strategy that extends beyond hybrid selection and will work to keep tar spot at bay for years to come.
“We want to select hybrids that will work for the future,” said Bates. “Especially if we get a year with a lot of moisture, that deep wetness drives tar spot development.”
Tar spot overwinters, so crop rotation may be the best option – especially in fields that experienced heavy pressure this season. In years with less favorable weather, rotation or management of infested debris may be of more value in limiting the development of tar spot.
For next growing season, remember to protect plant health throughout the season by reducing stress from lack of nutrients or from other pathogen infection may help reduce risk of yield loss.
Species
