what is causing yellow and brown spots on my sweet corn
Symptoms of anthracnose are fairly common early in the season on lower leaves and later in the season on upper leaves. However, it is normally not an economic problem. Drift or contact from chemicals, such as paraquat or glyphosate, can also cause spots on corn leaves. Paraquat injury on corn. These spots can also be confused with holcus spot, but an obvious pattern should be visible throughout the field.