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Selection in Smooth Bromegrass for Resistance to Pyrenophora bromi (Died.) Drechs¹

Synopsis: Bromegrass strains and varieties differed significantly in reaction to Pyrenophora bromi in the field, but a particular strain or plant tended to react similarly in different years. Agar and grain cultures were used in the greenhouse where significant correlations were found between clone and their open-pollinated progenies for reaction to P. bromi. Selection for resistance was not effective in nurseries exposed only to natural infection. Field inoculation with infected leaves was easy and effective. A procedure is suggested for screening plants for disease resistance before progeny yield tests are initiated.

² Graduate Assistant, Agronomy Department, University of Wisconsin, Madison, Wis., and Associate Professor, Agronomy Department, University of New Hampshire, Durham, N.H., respectively.

Received for publication March 15, 1956.