Fluorescent Pseudomonas strains were tested alone and in combinations for the ability to suppress take-all in greenhouse and growth chamber tests and to enhance the growth and yield of wheat in fields infested with Gaeumannomyces graminis var. tritici. In general, certain combinations of strains enhanced yield, whereas other mixtures and strains used individually did not. Overall, the best combinations were Q2-87 plus Q1c-80 plus Q8d-80 plus Q6Sc-80, Q2-87 plus Q1c-80 plus Q8d-80 plus Q69c-80, and Q1c-80 plus Q8d-80 plus Q6Sc-80. For example, in a field test on spring-sown wheat at Pullman, WA, during 1989, the treatment Q2-87 plus Q1c-80 plus Q8d-80 plus Q6Sc-80 significantly (P=0.05) increased yield 20.4% compared to a nontreated control, whereas each strain used individually had no significant effect on yield
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Elizabeth A. Pierson (1994) studied this question.