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“Sugarbeet Report” presented by NDSU Extension, features growing tips from NDSU sugar beet specialists and researchers.
This is the Sugar Beet Report, bringing you the latest information from NDSU throughout the sugar beet growing season. Approximately 83% of the 2024 sugar beet crop in North Dakota and Minnesota has been planted. Getting a jump start on the growing season has many benefits, but some of the most challenging weeds to manage are also emerging. Today, we're discussing weed strategy with Tom Peters, NDSU and University of Minnesota Extension Sugar Beet Agronomist. Tom, you often speak of water hemp emerging with sugar beet or water hemp emerging without activation of soil residue herbicides. How does 2024 compare to the last few years?
Tom Peters:Bruce, it's been an incredibly different year than our previous years. So most of the time, I'm talking about water hemp emerging at the same time of sugar beets or maybe water hemp emerging when we haven't had activating rains on fields. Not the case in 2024. So we've planted early, and we have over 80% of our crop planted, and we're getting very timely rains to get those preemergence herbicides activated.
Bruce Sundeen:Tom, early weeds are kochia and lambsquarters. Any sign of them in producer fields?
Tom Peters:I've seen both. But the weed that I'm really worried about, Bruce, is kochia. And the reason is is emerge kochia likely is glyphosate resistant kochia. We have to treat it when it's small. We're using a herbicide called spinnade. Spinnade is most effective when the kosher is very small. We call it less than dime size. Spinnade rate is gonna be dependent on the size of the sugar beets, and also environmental conditions. So on hot days, we're gonna use less. And I wanna make sure our growers know that we're gonna likely need to make repeat spinnade applications to control kochia.
Bruce Sundeen:Tom, let's go back to waterhemp. Pres are out. So what's the next step for waterhemp control?
Tom Peters:Well, since we had such an effective rain event to get our pres activated, let's let our herbicides do their work and let's not be in a hurry to get what we call the lay by applications on. So let's wait for a solid 2 leaf stage, and then continue to follow the programs. Use the ethofumesate herbicides, combine them with glyphosate and ethofumesate if you wish, and then make the second application at the 6th leaf stage.
Bruce Sundeen:Tom, do you have any comments on Dual Magnum alone or Dual Magnum mixed with ethofumesate pre, for those who are still planting?
Tom Peters:So, you know, it's interesting, Bruce. We haven't talked a lot about Dual Magnum, and the reason is is we planted early this year. My concern was the rates of dual magnum that we were using wouldn't last until the time when waterhemp is germinating and emerging. Well, guess what? Today, I saw waterhemp. It's starting to germinate and emerge. So I would highly recommend that any fields that are to be planted or are gonna be planted this week, that Dual Magnum be part of the recipe, part of the residual herbicide program, if the grower calls out waterhemp as an important production challenge in their field.
Bruce Sundeen:Can you give us an idea of the rates for dual magnum?
Tom Peters:In terms of rates, I would suggest either 8, 12, or 16 fluid ounces. So 8 ounces if your soils are sandier soils, coarse textured, less than 3 a half percent organic matter, 12 if you're combining with ethofumesate, and then 16 if the application is alone with no other herbicides.
Bruce Sundeen:Thanks, Tom. Our guest has been Tom Peters, NDSU and University of Minnesota Extension Sugar Beet Agronomist. This is the Sugar Beet Report, bringing you the latest information from NDSU throughout the Sugar Beet growing season.