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High Levels of Wheat Streak Mosaic Virus in Kansas Over the last several weeks, symptoms of wheat streak mosaic virus have been showing up in wheat fields across Kansas. This disease complex can be caused by several viruses, including wheat streak mosaic virus, Triticum mosaic virus, and wheat mosaic virus (high plains). These viruses are vectored by the wheat curl mite, a near-microscopic mite that survives between seasons on volunteer wheat and other grassy hosts. These grassy hosts serve as a “green bridge” for mites to survive from one wheat crop to the next. Infections may occur in the fall or spring, but fall infections typically result in the highest levels of yield loss. Although wheat streak mosaic infections can happen anytime, symptoms develop most rapidly at temperatures above 70°F. Symptoms have become more severe in Kansas over the last several weeks as temperatures have warmed. In this article, we walk through common questions about this complex of viruses.