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A Black, Readily Sporulating Mutant of Stemphylium solani. Homer D. Wells, Research Plant Pathologist, Crops Research Division, ARS, USDA, Tifton, Georgia 31794; Ian Forbes(2), and Charles R. Markham(3). (2)(3)Research Agronomist, and Agricultural Research Technician, respectively, Crops Research Division, ARS, USDA, Tifton, Georgia 31794. Phytopathology 61:575-577. Accepted for publication 29 December 1970. DOI: 10.1094/Phyto-61-575.

A mutation for black pigment and abundant spore production occurred in one of our cultures (61-20-E) of Stemphylium solani from blue lupine, Lupinus angustifolius. The mutant, isolates 61-20-E-1 and 61-20-E-2, sporulates readily in complete darkness and is equal to the parent strain in pathogenicity to susceptible biotypes of blue lupine.