Saturday, October 1, 2022

Weed seed killers and other control methods to be demonstrated

AMES, Iowa — Controlling weeds in farm fields is an annual challenge — especially with more weeds becoming resistant to the herbicide.

Fortunately, growers have a wide range of options for combating weeds, including some creative methods that may not have been employed in the past.

At this year’s Farm Progress Show, Aug. 30-Sep. At 1 Boone, Iowa State University Extension & Outreach will demonstrate one of the more innovative, and practical, ways of controlling weeds: a weed seed destroyer.

Seed killer is in use.Fit for a combination, weed seed killer does exactly what its name suggests. This powders and destroys the seeds so that they cannot germinate.

The Weed Seed Destructor (by Redcop) will be attached to the rear of the John Deere 680 combine and will be available for viewing outside the ISU Extension and Outreach Tent. While the machine will not be operating during the show, visitors can watch it in operation on a computer screen, and they can ask questions to weed science experts.

“We want to give the public a chance to see and ask about this innovative form of weed control technology,” said Prashant Jha, an Iowa State professor and extension weed specialist. “Farmers in central Iowa and Harrison County are already using this technology and we expect more to do so in the coming years.”

Other methods of weed control will also be shown, including videos of chaff lining, a method that guides the shredded husk into narrow strips as it exits the back of the combine at harvest time, allowing weed seeds to dissipate. The prevalence is reduced by more than 95%. There are weed seeds in fields and in small spaces.

The harvester or combine is modified with a baffle that separates the straw from the straw (which contains most of the weed seeds). The husk is directed into the narrow central band using a chute at the back of the combine.

Weed seeds in the husk are subject to rot, and burying small-seeded weed species such as hyacinth in the husk will potentially result in reduced emergence in the later growing season. High application rates of herbicide or shielded sprayers can be used to selectively control weeds in those narrow belts in the field.

Weed control exhibits will also give visitors the chance to test their knowledge of weed specimens found throughout the Midwest. Sixteen different species will be available for visitors to identify.

Visitors will have the chance to learn more about waterhemp, and how it can be pressed using the grain rye as a cover crop. Photos and sample trays will show the results of using unsweetened rye, with rye 4-6 inches long and rye terminated closer to the title.

“We’re going to show the potential for biomass (cover crops) to suppress weeds like waterhemp, and how results vary depending on the height of the cover crop,” Jha said.

Cereal rye has the best ability to suppress weeds because it accumulates more biomass than other cover crop species. A study for Farm Progress shows an incremental decrease in waterhemp depending on the density of rye.

Field studies indicate that grain rye biomass of 4,500 to 5,000 pounds per acre at the time of termination can significantly suppress the emergence of waterhemp in soybeans, and reduce the size and density of waterhemp when exposed to postemergence herbicides. can.

Additionally, growers can view a map of where herbicide resistance has been documented in Iowa based on a recent survey, and ask Jha and other experts questions about their own experience with herbicide-resistant weeds. Huh.

Jha will be joined by ISU extension and outreach field agronomists Angie Riek-Hintz, Meghan Anderson, Gentry Sorenson and Mike Witt, and several weed science graduate students.

Shareable photos: The seed is associated with the Destroyer Alliance.

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