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Rumors swirl around soybean cupping

Photo courtesy of Meaghan Anderson, Iowa State University Extension field agronomist

An extension field agronomist says rumors are flying as farmers across the Midwest report cupping in soybeans.

Meaghan Anderson with Iowa State University tells Brownfield there’s no data to support any cause for cupped beans except plant growth regulator herbicides.

“So there’s no data to support that Enlist cups Enlist soybeans, or that glufosinate or AMS (does). Or that drought stress or heat stress, or whatever stress may be doing that as well. There’s just nothing to support those theories.”

She says there is a lot of data that shows it takes very little dicamba to cup non-dicamba tolerant soybeans.

Anderson also questions some of the cupping claims on social media.

“I have seen in some cases where people have called things cupping that I would not call cupping, or that isn’t the true cupping-type symptomology.”

She says while it’s difficult to project the yield impact of cupping, soybeans in dry conditions do take longer to bounce back.

  • So, what about cupping in E3 beans, no cupping I n Xtend beans, in the same plot, right next to each other, with no dicamba weed control applied to field?
    Is it plausible that not all Libery genes & genetics are created equal and that some genetics do not metabolize some chemistry as well as other genetics?

    • I agree. I’ve seen several instances where no dicamba was ever used in the spray equipment before and no dicamba was sprayed nearby; however, Enlist and XtendFlex are showing different responses to the glufosinate applications. Enlist is cupping and XtendFlex is not. I wonder if these platforms metabolize the glufosinate differently?

  • If it was not legal to spray dicamba products when the temp is above 85 degrees, we would not have this problem.

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