Superweeds

A soybean field in Jasper County, Iowa, in 2016
File: Amy Mayer / Harvest Public Media

Regulators in Arkansas have proposed to effectively ban farmers from using a controversial weedkiller produced by Monsanto that is thought to be destroying crops after drifting in the wind.

The Arkansas State Plant Board proposed a ban on using the herbicide dicamba on cotton and soybeans from April 16 to October 31, essentially the entire growing season. (PDF)

Genetically engineered cotton seeds delivered to Missouri farmers in 2015 featured a warning not to spray them with dicamba. The corresponding dicamba herbicide was not approved by regulators until 2017.
File: Kristofor Husted / Harvest Public Media

The herbicide dicamba is thought to have been the culprit in more than 3 million acres of damaged soybeans across the country, destroying plants and leaving farmers out millions of dollars in crops.

The chemical has been in use for decades, so why is it today apparently causing farms so much damage?

A soybean field in Jasper County, Iowa, in 2016
File: Amy Mayer / Harvest Public Media

Hundreds of Midwest farmers are complaining of damage to their crops allegedly caused by the herbicide dicamba. The total number of damaged acres may come to more than 2.5 million acres, according to data compiled by a University of Missouri researcher.

Most of the damage has been found in the Midwest and South, with complaints of more than 850,000 damaged acres in Arkansas and more than 300,000 damaged acres in both Missouri and Illinois.

An Iowa soybean harvest
File: Amy Mayer / Harvest Public Media

The Missouri Department of Agriculture announced a temporary ban on the sale of agricultural products containing the pesticide dicamba on Friday, following a similar step by regulators in Arkansas.