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ABSTRACT
Temperature and osmotic potential had a significant effect on linear growth of Fusarium oxysporum, Fusarium species in section Liseola, and three recently described species. Linear growth was greatest at 25 C for all species except F. beomiforme for which maximum linear growth occurred at 30 C. Osmotic potentials of -0.4 MPa, -1.0 MPa, and -2.2 MPa were favorable for growth of all Fusarium species tested, with maximum linear growth recorded at -1.0 MPa. Linear growth was reduced significantly at osmotic potentials of -4.8 MPa and -9.9 MPa. Osmotic potential also influenced formation of sporodochia, microconidia, and chlamydospores on both carnation leaf agar and soil agar. Some implications of these findings for the activity and survival of Fusarium species are discussed.