Herbicide resistance field day planned in Iowa

Iowa State University Extension and Outreach
Corn field with weeds between rows.

AMES, Iowa — Iowa State University Extension and Outreach will host a herbicide resistance management field day on June 15, from 1 to 3 p.m. at the A. Knaphus farm located 1 mile south of McCallsburg on County Road S27.

Herbicide resistance in weeds is a major challenge faced by all producers. When weeds cannot be killed, farmers are often required to apply additional herbicide or adopt different management strategies that may cost them more money. Recent research at Iowa State showed that a change in corn herbicide program could reduce waterhemp emergence in soybean by 75%. This field day aims to educate farmers on effectively managing weeds before they become a major problem. 

Attendees will tour corn herbicide plots to discuss effective herbicide sites of action and weed control for both individual herbicides and a full program approach. 

Meaghan Anderson and Angie Rieck-Hinz, field agronomists with ISU Extension and Outreach, will lead attendees through the plots to discuss principles used to manage herbicide resistant weeds and tips for better managing weeds in future years. Each year’s herbicide program has important impacts on the weed populations in future years. 

There is no fee to attend the field day and all are welcome to attend. The plots are located on the east side of County Road S27, with signs posted to guide attendees to parking locations off the road. Certified crop advisers can receive 2.0 pest management CEUs for attending.

For more information, contact the ISU Extension and Outreach Story County office at 515-337-1601.