Red Crown Rot (RCR) spread into new soybean-growing regions across the United States in 2026, reported in 35 new counties across eight states this year, including first-time reports in Iowa and Alabama. With no in-season treatment available, Syngenta advises growers that post-harvest is an important time to identify affected fields and incorporate those insights into their 2027 management plans.
Dale Ireland, Ph.D., technical product lead at Syngenta, notes that the above-ground symptoms of RCR often resemble Sudden Death Syndrome (SDS), making accurate diagnosis more difficult as both soilborne diseases cause interveinal leaf chlorosis, stem discoloration and root rot. “As agronomists and growers are looking closer, fields that were assumed to have SDS are sometimes turning out to be RCR. If you suspect RCR in your fields, collect a sample and send to your local diagnostic laboratory for analysis and confirmation,” said Ireland.
Confirming RCR is the first step in preparing for next season. Victrato® seed treatment is the first federally labeled seed treatment for RCR suppression.
“Harvest gives growers a clearer picture of where disease affected performance and where they need added protection from a seed treatment like Victrato,” Ireland said. “Confirming RCR now and documenting where it occurred can help growers and build a more informed management plan for the future.”
This was the first year that Victrato was available for soybean growers and Ireland says the return on investment is fantastic. “Because something like sudden death syndrome, for instance, or nematodes, you can’t reach back and treat those. If you don’t proactively treat, prophylactically treat, you don’t have a chance to protect yourself against those. And the same is true with red crown rot. So if you’re aware that that is even a potential, it’s something that you need to do and get your seed treated with these products.”
Learn more in this interview with Ireland from the 2026 Commodity Classic.
Classic26 - Dale Ireland, Syngenta (6:11)











