When it comes to evaluating drift injury to any crop, South Dakota State University Extension Weed Science Coordinator Paul Johnson tells farmers to look for deformed plants and discoloration. It’s hard to distinguish between different growth regulators. “All of them are going to cause malformation of the leaves on the soybeans and depending on the type, whether it’s physical drift or contamination from a sprayer, this will sometimes be determined by how far out in a field it may go.” Johnson says if its drift coming into the field, it may only go in 100 to 200 feet. Leaf tissue samples are the ultimate way to determine what is impacting the crop. If you have questions on drift or want to learn more, contact the South Dakota Department of Agriculture, North Dakota Department of Agriculture or the Minnesota Department of Agriculture.