Corn Disease Risk Maps

One-Month Weather Outlook

In the next 30 days, the North will have an equal chance of having above- or below-average temperatures. Expect below-normal rainfall until the end of August, then changing to above-normal rainfall in September. In the next 14 days, expect above-average temperatures for the entire North, with normal to below-normal rainfall.

Gray Leaf Spot Risk Summary

Risk of gray leaf spot has increased in some regions within the Corn Belt.

Next two-week risk interpretation​

In the next two weeks, environmental conditions that favor this disease will increase within the central Corn Belt due to recent storms. This disease has been established in susceptible hybrids across this geography. Areas in yellow, consider a fungicide application on susceptible hybrids at the R3-R4 stage if the disease is confirmed on the earleaf. Areas orange, a fungicide is recommended on late maturity & late planted susceptible hybrids at the R3-R4 stage. Risk is higher in c/c fields.

ONE-MONTH RISK MAP