573 resultados para CULTIVOS ILÍCITOS - INVESTIGACIONES - LA MACARENA (META, COLOMBIA)


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Stem canker and black scurf diseases of potatoes are caused by the basidiomycetous fungus Tanatephorus cucumeris (ana-morphic species complex Rhizoctonia solani). Tese diseases have worldwide distribution wherever potato is grown but their etiology varies depending on the predominance of distinct R. solani anastomosis groups (AGs) in a particular area. Within the species complex, several AGs have been associated with stem canker or black scurf diseases, including AG-1, AG-2-1, AG-2-2, AG-3, AG-4, AG-5 and AG-9. Tis article reports on the most comprehensive population-based study, providing evidence on the distribution of R. solani AGs in Colombian potato fields. A total of 433 isolates were sampled from the main potato cropping areas in Colombia from 2005 to 2009. Isolates were assigned to AGs by conventional PCR assays using specific primers for AG-3, sequencing of the ITS-rDNA and hyphal interactions. Most of the isolates evaluated were assigned to AG-3PT (88.45%), and a few to AG-2-1 (2.54%). Te remaining isolates were binucleate Rhizoctonia (AG-A, E, and I). Pathogenicity tests on the stems and roots of different plant species, including the potato, showed that AG-3PT affects the stems of solanaceous plants. In other plant species, damage was severe in the roots, but not the stems. AG-2-1 caused stem canker of Solanum tuberosum cv. Capiro and in R. raphanistrum and B. campestris subsp. Rapa plantlets and root rot in other plants. Te results of our study indicated that R. solani AG-3PT was the principal pathogen associated with potato stem canker and black scurf diseases of potatoes in Colombia.

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Previo la discusión de los antecedentes generales, se describen los principales contenidos de la enseñanza en población en las facultades de ciencias de la salud en Colombia.

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Análisis comparativo del manejo presupuestario de la inversión pública bajo las normas establecidas en el decreto extraordinario 294 de 1973 y aquéllas previstas en el Estatuto Orgánico de Presupuesto sancionado en abril del presente año. Se centra en la función del presupuesto dentro del marco macroeconómico, en su coherencia con la política fiscal y macroeconómica, y en la maximización de la eficiencia en la asignación del gasto.

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