Maintain soybean aphid scouting through R6.5 (pods and leaves beginning to yellow), regardless of calendar date. Through R5 (seeds developing and filling pod cavity), use the university created ...

Expected yield is <60-70 bu/ac – There is probably enough N available in the soil and via fixation. Soybeans have matured past R6 (full seed stage) – The N requirement of soybean is greatly reduced ...

“Most years, with June 1 planting, the 3.5-to-4.1-maturity soybeans would have outperformed earlier-maturing varieties because they take longer to reach the end of the R6 stage,” Ferrie says.

On the other hand, while it does not often happen, very large aphid populations can cause yield losses to R6 soybeans into September. Disease: Fungal diseases can cause rapid aphid population ...