Shortly after the Germ Theory of Disease was firmly established, Iwanowski, in 1892, and later Beijerinck, in 1898, passed sap of tobacco plants infected with mosaic virus through bacterial-proof filters. They demonstrated that filtrates, although apparently sterile fluids, were infectious. Plant pathologists were well-pleased with the new and rewarding Germ Theory of Disease which stated that for each infectious disease there as a causal organism. Many assumed that the fluids contained very small bacteria which they could not see in the microscope but which could pass through the filters. This organismal theory was not abandoned until the 1920’s, even though Beijerinck emphasized the noncorpuscular nature of the infectious filtrates and called them contagious living fluids.
KeywordsVirus Disease Plant Virus Mosaic Disease Amino Triazol Aster Yellow
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