- 
Listen To The Story
Marketplace

Farmers and agriculture experts in corn belt states are wringing their hands over the appearance of a superweed called Palmer amaranth. The tall, tough weed is native to the southwest and has been a problem in the southern part of the country for a couple decades.

But now it's showing up in Midwestern states like Iowa and Minnesota, and threatening to reduce corn and soybean yields.

Farmers trying to do a good thing, by planting acreage with native grasses and flowering plants, may unwittingly help to spread the weed.

Click the audio player above to hear the full story. 

Follow Annie Baxter at @anniebaxter123