By Ryan Flaming, County Extension Agent, Agriculture & Natural Resources
This year when you are out scouting your soybean fields, be sure to keep a look out for soybean vein necrosis virus (SVNV). The virus has likely been in soybeans for some time, but was probably overlooked or misdiagnosed before recent detections. The disease has been detected across the United States and in Ontario, Canada.
SVNV symptoms SVNV symptoms are typically randomly distributed throughout the canopy. SVNV lesions start as yellowing (chlorosis) along the leaf vein. Over time, yellowing becomes red-brown irregular shaped lesions, and eventually leads to tissue death. The yellowing around the lesion may begin to spread beyond the vein but will typically be limited to the area within major leaf veins. The symptoms are generally not uniform across the leaf. Leaf tissue will die following chlorosis. The lesions range from ¼ to ½ inch 6 to 12 mm but can be larger.