Watch for red crown rot in soybeans next spring

A plant pathologist with University of Missouri Extension says farmers should monitor for red crown rot in soybeans next year.

Mandy Bish says the fungus overwinters in the soil, impacts soybean roots shortly after planting and looks a lot like Sudden Death Syndrome.

“The biggest difference between SDS and red crown rot is on the roots of the plant with red crown rot you’ll see tiny red dots, but the structures aren’t always present on the plant,” she says. “If that’s the case, SDS has leaves that fall off the plant and with red crown rot, the leaves stay on the plant.”

Bish says farmers might also notice patches of a field showing SDS-like symptoms after planting an SDS-resistant variety.

“It could be there’s a breakdown in resistance, but it also could be it’s not SDS. It might be other diseases that look like SDS.”

Bish says the disease hasn’t been confirmed in Missouri yet, but it has been confirmed in Illinois and southern states. She says crop rotation and fungicide seed treatments can help manage red crown rot.

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