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Soil Transmission and Electron Microscopy of Wheat Spindle Streak Mosaic. M. V. Wiese, Department of Botany and Plant Pathology, Michigan State University, East Lansing 48823; G. R. Hooper, Department of Botany and Plant Pathology, Michigan State University, East Lansing 48823. Phytopathology 61:331-332. DOI: 10.1094/Phyto-61-331.

Transmission of the wheat spindle streak mosaic disease to wheat seedlings (Triticum aestivum L. ‘Genesee’) grown in infested soil was markedly promoted by cool and freezing temperatures. Vernalization environments increased both symptom severity and the percentage of test plants affected. Affected tissues examined in an electron microscope contained viruslike rods and abundant pinwheel inclusions.