corn harvest

AMES, Iowa — Controlling weeds has always been one of the biggest challenges of producing a crop, and with the ever-present issue of herbicide resistance, farmers are constantly searching for new solutions.

Some practical but innovative ideas will be explored during an Oct. 21 workshop, when Australian researcher Michael Walsh visits Iowa State University to talk about the various ways farmers can harvest and destroy weed seeds from the combine, according to an Iowa State news release.

Walsh is director of weed research at the University of Sydney, Australia. Weed resistance in Australia is among the worst in the world, and Walsh has explored a number of seed harvest solutions, including removing chaff from combines, grinding chaff and weed seed and windrowing/tramlining the chaff.

Walsh will host a harvest weed seed control clinic at the Iowa State University Field Extension Education Laboratory Oct. 21 from 10 a.m. to 3 p.m. The morning session will focus on the principles of harvesting weed seeds as a method of control, and following lunch, Walsh will demonstrate the types of combine and equipment modifications used to separate weed seeds from other materials entering the combine.

“‘Harvest weed seed control’ is an alternative weed control tactic that targets weed seeds before they are shed from the plant, using the combine to intercept the seeds and prevent them from entering the seedbank and contributing to future problems,” said Meaghan Anderson, field agronomist with ISU Extension.

According to Anderson, some Australian farmers are using combines modified to either pull a machine that collects and crushes the weed seed or modified internally in a way that collects and grinds the seed, or deposits the chaff behind the combine.

Anderson said some of the methods may not work in the United States, at least not currently, but there may be some ideas for the future.

“While the technology is not currently available for our system, it is likely this will be a tool that will be of value in the near future,” she said.

The clinic is free and open to the public. Iowa State’s Field Extension Education Laboratory is located at 1928 240th St., Boone, Iowa. RSVP by Oct. 14 to Anderson at or 319-331-0058.

Sign up for our weekly CropWatch newsletter

* I understand and agree that registration on or use of this site constitutes agreement to its user agreement and privacy policy.