Etiology of Black Pod Disease and Seed Coat Discoloration of White Beans

Tu, J.C.

Canadian Journal of Plant Science 62(2): 277-284

1982


ISSN/ISBN: 0008-4220
DOI: 10.4141/cjps82-044
Accession: 068494211

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Abstract
Alternaria alternata (Fr.) Keissler was identified as the cause of the black pod disease and greyish discoloration of the seed coat of white beans (Phaseolus vulgaris L.). The severity of pod discoloration varied from dark grey flecks or stipples to dark grey patches which later coalesced. Seeds from severely affected pods often showed varying degrees of discoloration, which persisted through processing. Benomyl and chlorothalonil sprays, used to control white mold (Sclerotinia sclerotiorum), significantly increased the incidence of discoloration. In vitro, A. alternata was insensitive to both fungicides. There was more black pod disease and seed-coat discoloration in the early maturing cultivar Seafarer, than in the late-maturing cultivar Fleetwood.