Illinois corn yields seen below average.

Corn farmers in west-central Illinois are facing potentially smaller corn yields this fall in what has been a challenging growing season after extreme weather and heavy rains delayed plantings across much of the US Midwest, scouts on an annual tour said on Wednesday.

Many of the soy fields surveyed in Illinois on the third day of the Pro Farmer Midwest Crop Tour were also behind their normal growing schedule, as they were in parts of...