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The cause of deep-pitted scab of potatoes

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Abstract

By use of a tyrosine-casinate-nitrate medium,Streptomyces atroolivaceous, S. cinerochromogenes, S. corchorusii, S. diastatochromogenes, S. lydicus, S. malachiticus, and three unidentifiedStreptomyces spp. were isolated from deep-pitted scab lesions on potato cultivars Green Mountain, Red Pontiac, Russet Burbank, and Saco. Over 90% of the deep-pitted lesions contained one or more of theseStreptomyces spp., butS. scabies the cause of shallow scab was not isolated. Isolates ofStreptomyces spp. were also consistently isolated from aseptically excised non-necrotic tissue near the edge of lesions. TheseStreptomyces spp. appeared to be the primary colonizers of this tissue.

Alternaria spp.,Fusarium spp.,Penicillium spp.,Rhizopus spp.,Trichoderma spp., and several unidentified non-sporulating fungi as well asBacillus spp.,Pseudomonas spp., andMicrococcus spp. were isolated from deep-pitted scab lesions. Fungal and bacterial isolates varied from one scab lesion to another and except for anAlternaria sp., were not pathogenic.

Most of theStreptomyces spp. isolates used to infest heat pasteurized field soil caused deep and/or shallow scab on tubers of the potato cultivar Kennebec in greenhouse and outdoor plantings. Re-isolations from resulting scab lesions yieldedStreptomyces spp. similar in morphology to those used as inoculum. We concluded that a number ofStreptomyces spp. probably includingS. scabies (ATCC 3352 = S.griseus) may cause deep and shallow scab.

Resumen

Mediante el uso de un medio de tirosina-caseinato-nitrato,Strep-tomyces atroolivaceous, S. cinerochromogenes, S. corchorusii, S. diastatochromogenes, S. lydicus, S. malachiticus, y tres especies deStreptomyces no-identificadas fueron aisladas de cavidades profundas producidas por lesiones de sarna en los cultivares de papa Green Mountain, Red Pontiac, Russet Burbank, y Saco. Más del 90% de estas lesiones de cavidades profundas tuvieron una o más de estas especies deStreptomyces, pero S.scabies, la causa de la sarna común (superficial) no fué aislada. Aislamientos deStreptomyces spp. fueron también obtenidos consistentemente de cortes asépticos de tejido sin necrosar del borde de las lesiones. EstosStreptomyces spp. parecieron ser los colonizadores primarios de este tejido.

Alternaria spp.,Fusarium spp.,Pencillium spp.,Rhizopus spp.,Trichoderma spp., y varios hongos no esporuladores sin indentificar como tambiénBacillus spp.,Pseudomonas spp., yMicrococcus spp. fueron aislados de estas cavidades profundas producidas por lesiones de sarna. Los aislamientos de hongos y bacterias variaron de una lesión a otra y fueron no patogénicos a excepción de una especie deAlternaria. La mayoría de las especies deStreptomyces causaron lesiones profundas y/o superficiales de sarna en tubérculos de la variedad Kennebec cuando suelo pasteurizado al calor fue infestado con ellas, tanto en siembras de invernadero como en condiciones de campo. Reaislamientos de las lesiones de sarna produjeron especies deStreptomyces similares en morfología a aquellas usadas como inóculo. Nosotros hemos con cluído que un número de especies deStreptomyces, incluyendo probablemente a 5.scabies (ATCC 3352 = S.griseus) pueden causar lesiones de sarna profunda y superficial.

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Authors and Affiliations

  1. Department of Plant Pathology, Irrigated Agriculture Research and Extension Center, 99350, Prosser, WA

    J. G. Archuleta (Former Graduate Assistant) & G. D. Easton (Plant Pathologist)

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  1. J. G. Archuleta
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  2. G. D. Easton
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Mention of a product used in these studies does not constitute a recommendation of the product by Washington State University over other products.

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Archuleta, J.G., Easton, G.D. The cause of deep-pitted scab of potatoes. American Potato Journal 58, 385–392 (1981). https://doi.org/10.1007/BF02852950

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