Corn Disease Risk Maps

One-Month Weather Outlook

In the next 30 days, temperatures are expected to range from normal to above normal, except along the northeastern coast, where temperatures will be above normal. Precipitation will be above average in regions east of the Mississippi River. In the next 14 days, temperatures should remain near average. Rainfall will be above average east of the Mississippi River, and normal to below normal as you move west.

Gray Leaf Spot Risk Summary

Risk of gray leaf spot ranges from moderate to high within most of the Corn Belt.

Next two-week risk interpretation

In the next two weeks, conditions are moderately to highly favorable for this disease, especially in regions south of I-70. Environmental conditions become more favorable in the following weeks. Areas in yellow, a fungicide is recommended in VT-R4 corn if GLS lesions can be found one leaf below the earleaf. Areas in orange, a fungicide is recommended on susceptible hybrids at the VT-R4 stage. Scout carefully, bacterial leaf streak has been commonly found and the two can be confused at the early stages.

ONE-MONTH RISK MAP