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Adolf Mayer aigrettes appear attacked barley become beds black dust blackened blighted bunt balls bunt dust bunt plant bunted heads bunted kernels bunted wheat chlorosis Clean wheat color condition contained contaminated straw copper sulphate culms darnel seed decagrams diseased heads diseased plants diseases of wheat division Duhamel effect embryo epidermis ergot Erwin Baur experiments fact gemmae germination globules glumes growth healthy heads healthy plants inches infection inoculated juice large number latter leaf leaves less loose smut manure memoir ment moistened Montauban mosaic disease nated observed pericarp present produced puccinias quantity remedies roots rows of plot rust salt saltpeter seed seed sown sheep manure smutted heads soil solution sometimes sound heads sowed sown in plot spores spring wheat stamens stem substance suspected straw temperature Tessier tion tobacco treated treatment uredos variegation virus washed wheat bunt wheat plants