. Fig. 44.—Rye mosaic. Plants infected with the mosaic virus have leaves mottled with yellow green and dark green. Such mottling is a characteristic symptom of the disease. The mottle pattern varies greatly, being sometimes predominantly yellow, sometimes predominantly green. to be resistant to mosaic. The mosaic virus can persist in soil for as long as six years. Consequently, fields heavily infested with mosaic should not be planted to either rye or wheat for at least that length of time.

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