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SUMMARY
Optimal temperatures for perithecial production and ascospore discharge in Gibberella zeae differed significanly. Numbers of perithecia increased with increasing temperature to ca. 29 C, and decreased sharply at temperatures higher than 29 C. This optimum is very close to the optima for macroconidial production and mycelial growth. Apparently the optimum temperature for perithecial initiation is slightly higher than for maturation. Perithecia were produced within 14 da at temperatures as low as IS C. Ascospore discharge is favored by low temperatures with no discharge above 26 C. Spectral composition and age of light source affect the production of perithecia. Production of perithecia requires low intensity ultraviolet (UV) light below 390 nm for initiation; however, the spectral region required for maturation has not been determined. The spectral region most effective in stimulating production of perithecia is below 320 nm.