Is that Soybean Mosaic Virus or Herbicide Injury?

Damon Smith, Extension Field Crops Pathologist, Department of Plant Pathology, Vince Davis, Extension Weed Scientist, Department of Agronomy, Shawn Conley, Extension Soybean Specialist, Department of Agronomy, University of Wisconsin-Madison

Calls, photos, and plant samples have been coming in over the last week or so with soybeans exhibiting abnormal growth including leaf cupping and strapping.  Some of the symptoms look very similar to soybean mosaic virus (SMV) giving the leaves a somewhat bumpy and rippled appearance (Fig. 1).  However, further investigation has yielded clues that the cause of the symptoms is not SMV.  Samples coming into the diagnostic lab are actually lacking few symptoms of virus but exhibiting symptoms of growth regulator herbicide injury.

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