Abstract
Silver scurf, caused byHelminthosporium solani, is an important disease of table stock and processing potatoes, for which few management strategies exist. Two hundred-twelve accessions of tuber-bearingSolarium species were screened for their response toH. solani. Tubers were inoculated in the laboratory with a spore suspension, incubated for 1 mo, and evaluated for infection using the number of conidiophore groups per square millimeter of sporulating tuber surface. Tubers with relatively low sporulation in the laboratory were retested using natural inoculum present in potato storages and assessed for infection. There were significant differences (P < 0.05) between accessions with both methods of inoculation. Some accessions ofSolanum demissum, S. chacoense, S. acaule, S. stoloniferum, S. oxycarpum, andS. hondelmannii consistently demonstrated low sporulation in laboratory and storage, suggesting partial resistance. Both methods of inoculation, laboratory and storage, were found to be correlated (ranging from r = 0.582,P= 0.006; to r = 0.925,P < 0.003).
Compendio
La costra plateada de la papa, producida por Helminthosporium solani, es una enfermedad importante en papas para consumo fresco y procesamiento, con limitadas prácticas de manejo. Se evaluaron 212 entradas de Solanum tuberíferos por su respuesta a H. solani. Los tubérculos fueron inoculados en laboratorio con una suspensión de esporas, incubados por 1 mes, y evaluados por infección usando el numéro de grupos de conidióforos por milímetro cuadrado de superficie de tubérculo con esporulación. Los tubérculos con baja esporulación en el laboratorio fueron re-evaluados usando inóculo natural presente en almacenes de papa y analizados por infecciín. Se encontraron diferencias significativas (P<0.05) entre las entradas con los dos metodos de inoculación. Algunas entradas de S. demissum, S. chacoense, S. acaule, S. stoloniferum, S. oxycarpum, y S. hondelmannii mostraron consistentemente reducida esporulación en laboratorio y en almacen, lo cual sugiere una resistencia parcial. Se encontró que ambos metodos de inoculación, laboratorio y almacen, estaban correlacionados (rango de r = 0.582, P= 0.006; ar = 0.925, < 0.003).
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Rodriguez, D.A., Secor, G.A., Gudmestad, N.C. et al. Screening tuber-bearingSolanum species for resistance toHelminthosporium solani . American Potato Journal 72, 669–679 (1995). https://doi.org/10.1007/BF02849176
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DOI: https://doi.org/10.1007/BF02849176