Strains of actinomycetes causing russet scab on potato tubers were different from Streptomyces scabies and S. acidiscabies. The russet scab-inducing organisms were characterized by a bright yellow mycelium on yeast malt extract (YME) which turned brown with age, and by aerial mycelium forming flexuous spore chains which appeared as a gray mass on the colonies. The organisms utilized L-arabinose, D-fructose, D-glucose, D-mannitol, raffinose, rhamnose, sucrose, and D-xylose. They degraded xanthine and xylan, but did not produce melanin
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Esther Faucher (1993) studied this question.