Studies on Variation with Ophiobolus Graminis

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Abstract
Varia-tions were studied in the monosporous F1 progeny of an isolate of Ophiobolus graminis from wheat. All F1 ascospores from perithecia on living host tissue were strongly pathogenic, but half from a perithecium in culture were weakly pathogenic. Perithecia were formed in culture and on host tissue only by strongly pathogenic progeny. Strongly pathogenic progeny survived well on artificially infected wheat straw buried in unsterilized soil, but weakly pathogenic progeny did not Survival of all isolates was increased by nitrate enrichment of soil.