In recent days, Illinois fields have seen a good amount of rain and are generally looking healthy, says Jason Haegele, WinField United agronomy manager. With the exception of some later-planted or replanted fields, corn is beginning to tassel or has tasseled during the last couple of weeks. Soybean growth stages range from R2 (full flowering) to R3 or R4 (pod set).
Haegele notes that so far this season, disease pressure in cornfields has been low. However, with recent high temperatures, high humidity and lots of rain, corn pathogens like gray leaf spot are beginning to make an appearance. In addition, farmers in northern Illinois should scout for tar spot, and farmers in southern Illinois should be on the lookout for rust. During his scouting this season, Haegele has also seen some frogeye leaf spot appearing in southern Illinois soybean fields.
Fungicide applications at tassel are occurring now and should be a consideration for all farmers. Haegele notes that good to high yield potential along with environmental conditions that promote disease pressure are reasons to make an application.
For farmers evaluating the economics of a fungicide application, ag tech tools like the WinField United R7® Field Forecasting Tool can help predict the yield potential such an application could bring. Similarly, for farmers who might still be applying late-season nitrogen through high-clearance application equipment, the Field Forecasting Tool can help determine the nitrogen rate that will help optimize yield and ROI potential.