1. Mechanical injury alone caused cells of wheat, sorghum, and broom corn to become markedly discolored near the points of injury; such discolored regions lacked callosities, auto-stained disks, red ...

Thirty-nine cultures of Alternaria and Macrosporium were used in 2,258 of the greenhouse inoculations and1,165 of the tube inoculations. i 2. Of the 198 "new diseases," 165 resulted from inoculations ...