Winter wheat infected by wheat soil borne mosaic develops a pale-yellow discoloration shortly after breaking
dormancy in the spring. The incidence of wheat soil borne mosaic is often greater in low areas of a field, where
moist soil conditions favor growth of the protozoa that spread this viral disease. Leaves of infected plants often
have a mosaic pattern of dark green blotches on a pale yellow background. Symptoms normally fade when warm
weather slows the viral activity within infected plants