The soybean cyst nematode, a microscopic roundworm that feeds on soybean roots, is responsible for more yield and monetary losses each year than any other pathogen in Kentucky. It also is a pathogen that hides in fields, with growers possibly never seeing the signs of its existence. Preliminary findings from an ongoing survey that began in 2019 show the soybean cyst nematode is present in 84 percent of Kentucky soybean fields. While some producers will see signs of yellowing or stunted growth in their soybeans, most do not. Soybeans that appear healthy but are in a soybean cyst nematode-infested field will have as much as a 30 percent yield loss.