An Illinois Soybean checkoff-funded research project is making progress in understanding how two troublesome pests—red crown rot (RCR) and soybean cyst nematode (SCN)—may be working together to impact soybean yields. With both pathogens present in Illinois fields, researchers are looking closely at how infection timing and disease interactions affect plant health and what commercial products can help manage them. 

Led by Dr. Boris Camiletti, this project aims to provide farmers with more effective management strategies. 

“Our greenhouse protocol optimization trials are nearly complete, with plants at the R6 stage,” Camiletti reported in early March. “These trials are helping us refine the best ways to study the impact of both pathogens and test the performance of different commercial treatments.” 

The team has also begun studying how the age of the soybean plant at the time of infection influences disease severity—a key factor when considering treatment timing. 

Interestingly, the team did not see the expected foliar symptoms of red crown rot, even when using high levels of inoculum. That finding has shifted their focus to yield-related factors like root and grain weight at harvest, which may give a clearer picture of the disease’s long-term effects. 

The connection between SCN and red crown rot isn’t fully understood yet, but this study is helping to fill in the gaps. As results come in, the goal is to deliver clear, data-driven recommendations for managing these pests in Illinois fields. 

To follow this Illinois Soybean checkoff-funded study, visit the Field Advisor Research Hub.