New Sources of Resistance in Vicia faba to Chocolate Spot Caused by Botrytis fabae. S. B. Hanounik, Plant Pathologist, International Center for Agricultural Research in the Dry Areas (ICARDA), P.O. Box 5466, Aleppo, Syria. L. D. Robertson, Plant Breeder, International Center for Agricultural Research in the Dry Areas (ICARDA), P.O. Box 5466, Aleppo, Syria. Plant Dis. 72:696-698. Accepted for publication 2 December 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0696.

A two-cycle screening technique was used to evaluate 253 faba bean germ plasm accessions for resistance to chocolate spot. In the first cycle in 1985, faba bean accessions were exposed to a mixture of 20 isolates of Botrytis fabae collected from a wide range of naturally infected leaves of local susceptible cultivars grown in major faba bean production regions in Syria. Some of the resistant accessions detected in 1985 developed a few coalesced sporulating lesions. To subject resistant materials to a rigorous evaluation, 20 isolates of B. fabae obtained from such lesions were used in a second screening cycle in 1986 to inoculate progenies of the resistant accessions detected the previous season. Of the 253 accessions, 14 new, potentially useful sources of resistance to a wide range of isolates of the pathogen were identified.