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Marestail Fall Control

Marestail Fall Control
By Gared Shaffer
 
No-till crop production in South Dakota is on the rise. Marestail (also known as horseweed) is a native plant to the United States and is considered either a winter annual or biennial species that is often difficult to identify at the rosette stage (picture on right above). In the Dakota’s, the Marestail population will germinate in the fall and bolt in the spring. The first leaves of Marestail have a broad, round end and have a whorled leaf arrangement that forms a rosette. Small plants may be purple or green during cool weather. Marestail bolts in the spring, leaves are alternate, hairy, 1 to 4 inches long, linear in shape and attached directly to the stem. Not letting Marestail produce seed is of upmost importance because they can produce up to 200,000 seeds per plant. According to research, 20 to 91 percent of those seeds that germinate in the fall can survive through the winter.
 
A cost-effective fall burndown after harvest before a hard freeze could include a Dicamba product, glyphosate, 2,4D, Atrazine, Salflufenacil, Flumioxazin or a mixture of these depending upon what cash crop will follow in the spring. Atrazine, 2,4D, Salflufenacil, Flumioxazin and glyphosate work satisfactory under cool temperatures. Dicamba products do not work well under cool temperatures. Make dicamba applications when high temperatures are at least in the mid 50’s. Controlling Marestail in the spring burndown, Pre-emergent or Post-emergent applications in cash crops can be challenging for producers. Often these plants escape the burndown or Pre-emergent applications and are not noticed until bolting. The most successful treatments for control of Marestail is in the fall, but if the species exists in your field in the spring then options are available if field conditions allow application. South Dakota State University has not reported Marestail glyphosate resistance; North Dakota State University however has, so it is a possibility to be considered. Resistance can be slowed by rotating crops and herbicide programs. Other options would be to incorporate a cover crop between corn and soybeans such as Rye to help suppress winter annual and cool season annual weeds.
Source : sdstate.edu

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Why Your Food Future Could be Trapped in a Seed Morgue

Video: Why Your Food Future Could be Trapped in a Seed Morgue

In a world of PowerPoint overload, Rex Bernardo stands out. No bullet points. No charts. No jargon. Just stories and photographs. At this year’s National Association for Plant Breeding conference on the Big Island of Hawaii, he stood before a room of peers — all experts in the science of seeds — and did something radical: he showed them images. He told them stories. And he asked them to remember not what they saw, but how they felt.

Bernardo, recipient of the 2025 Lifetime Achievement Award, has spent his career searching for the genetic treasures tucked inside what plant breeders call exotic germplasm — ancient, often wild genetic lines that hold secrets to resilience, taste, and traits we've forgotten to value.

But Bernardo didn’t always think this way.

“I worked in private industry for nearly a decade,” he recalls. “I remember one breeder saying, ‘We’re making new hybrids, but they’re basically the same genetics.’ That stuck with me. Where is the new diversity going to come from?”

For Bernardo, part of the answer lies in the world’s gene banks — vast vaults of seed samples collected from every corner of the globe. Yet, he says, many of these vaults have quietly become “seed morgues.” “Something goes in, but it never comes out,” he explains. “We need to start treating these collections like living investments, not museums of dead potential.”

That potential — and the barriers to unlocking it — are deeply personal for Bernardo. He’s wrestled with international policies that prevent access to valuable lines (like North Korean corn) and with the slow, painstaking science of transferring useful traits from wild relatives into elite lines that farmers can actually grow. Sometimes it works. Sometimes it doesn’t. But he’s convinced that success starts not in the lab, but in the way we communicate.

“The fact sheet model isn’t cutting it anymore,” he says. “We hand out a paper about a new variety and think that’s enough. But stories? Plants you can see and touch? That’s what stays with people.”

Bernardo practices what he preaches. At the University of Minnesota, he helped launch a student-led breeding program that’s working to adapt leafy African vegetables for the Twin Cities’ African diaspora. The goal? Culturally relevant crops that mature in Minnesota’s shorter growing season — and can be regrown year after year.

“That’s real impact,” he says. “Helping people grow food that’s meaningful to them, not just what's commercially viable.”

He’s also brewed plant breeding into something more relatable — literally. Coffee and beer have become unexpected tools in his mission to make science accessible. His undergraduate course on coffee, for instance, connects the dots between genetics, geography, and culture. “Everyone drinks coffee,” he says. “It’s a conversation starter. It’s a gateway into plant science.”