It has been accepted for many years that there is an interaction between plants and the microbiological life that exists in soil. This interaction is particularly important in the rhizosphere (Hiltner, 1904), where plant exudates directly feed the microbial population, which in turn is responsible for nutrient cycling, production of growth promoters, and occasionally development of pathogenicity. These factors are important to plant health. However, the difficulties of studying such interactions in the soil and the inability to grow the majority of soil microorganisms in the laboratory have resulted in limited research in this area.