The soybean cyst nematode (SCN) continues to erode yields in Ohio, often largely unnoticed. Approximately every three years, a map is updated where SCN is found around the country using records from diagnostic clinics and data from field studies.
As researchers expected, SCN has expanded in Ohio — from the western to the eastern borders of the state. In addition, researchers are identifying more fields in the state with populations above the economic thresholds. SCN populations of 1,500 eggs per cup of soil lead to 25% to 50% yield loss without any above ground symptoms.
“We’re identifying fields where the counts are getting way out of line, up in the 18,000 to 25,000 eggs per cup of soils. The cautionary tale is that folks really need to keep track of the SCN populations and sample,” said Anne Dorrance, Ohio State University Extension plant pathologist. “SCN is an obnoxious little thing. You can’t even see the difference in the field and you are losing 15% to 20% of your yield.… Continue readingRead More »