Context: the potato crop, in Nariño, presents a significant number of commercial varieties, but diverse phytosanitary problems [like the pathogen R. solani Kühn] affect its production and yield. Knowledge gap: there is no information, in the department of Nariño, about the attack of this phytopathogen to different potato genotypes. Purpose: the objective of this research was to determine the damage caused by black scurf [R. solani Kühn] on five commercial potato varieties in the department of Nariño. Methodology: in three potato producing municipalities of the department of Nariño [Ipiales, Pasto and Túquerres], using a Randomized Complete Block Design [with four replications and five treatments] were evaluated these variables: Incidence on emergence and sprouting, incidence on harvest, and Commercial yield.  Finally, it was carried out an analysis of variance, using Tukey’s comparison tests. Results and Conclusions: in the locality of Túquerres, the highest percentage of incidence in emergence and sprouting was obtained [36.04 %], with statistical differences in comparison to the localities of Pasto [30.70 %] and Ipiales [31.98 %]. For the harvest incidence variable, the Roja Huila genotype [in Túquerres] was the most affected, reaching an incidence percentage of 19.94 %. Finally, in the evaluation of commercial Yield, the Superior genotype [in Pasto] presented the best performance, with an average of 22.37 t/ha.

La achira (Canna edulis Ker.) es una especie utilizada para la producción de almidón y alimentos artesanales. En Colombia, se estima un área cultivada de 800ha; en el departamento de Nariño, se viene presentando un disturbio de etiología viral, conocido por los agricultores como el rayado, por sus síntomas en las hojas, pero sin registros previos en esta zona. La enfermedad causa pérdidas en el rendimiento, aunque no se ha establecido con precisión. Con el objetivo de esclarecer la naturaleza de dicha patología y la identidad del patógeno asociado al problema, en la Universidad de Nariño, se realizó una investigación, mediante pruebas moleculares de PCR y RT-PCR, secuenciación, serología y microscopía electrónica, de muestras foliares colectadas en las zonas productoras. Los síntomas más sobresalientes en tejidos afectados fueron mosaico amarillo, moteado, rayado clorótico, aclaramiento de nervaduras entre otros. No se detectaron inclusiones citoplasmáticas similares a las producidas por Potyvirus, ni se observaron partículas virales, tampoco hubo resultados positivos con serología, pero sí se logró amplificación de un fragmento de cDNA, con cebadores específicos para Potyvirus y homología de 98% de las secuencias con el virus Sugarcane mosaic virus SCMV. Este es el primer reporte de SCMV en achira en Nariño, Colombia.

Introducción y Objetivo: La enfermedad periodontal es una patología de origen bacteriano con manifestaciones inmunoinfl amatorias que desencadenan pérdida de inserción y soporte del diente, últimamente se ha encontrado relación de esta con otras enfermedades sistémicas. Según el último Estudio Nacional de Salud Bucal en Colombia (ENSAB III 1998), los conocimientos y prácticas de la enfermedad periodontal son más defi cientes que para otras patologías. El objetivo de esta investigación fue evaluar el nivel de conocimiento sobre enfermedad periodontal de una determinada población, analizando el impacto de una charla educativa y motivacional. Materiales y Métodos: Se realizó un estudio de intervención comunitaria, longitudinal en una muestra de 301 trabajadores en diferentes empresas del área metropolitana de Medellín, se ejecuta una encuesta inicial, seguida de una charla educativa y motivacional, se entrega a cada persona encuestada un cepillo y crema dental, posterior a esto se realiza la encuesta inicial a los mismos empleados y así evaluar el impacto que tuvo dicha intervención y el nivel de conocimiento adquirido. Resultados: El nivel de conocimiento pasó de 2,38 ± 0,78 a 3,39 ± 0,81 con un aumento del 42,4%. Conclusión: Hubo cambios signifi cativos en el aprendizaje acerca de la enfermedad periodontal.   Abstract: Introduction and Objetive: Periodontal disease is a pathology of bacterial origin with inmunoinfl amatory manifestations giving rise to loss of insertion and tooth-support. Recently a relation has been reported between periodontal disease and other systemic diseases. According to the last National Study of Oral Health in Colombia (ENSAB III 1998), knowledge and awareness of periodontal disease and practices is more defi cient than for other pathologies. The aim of this investigation was to evaluate the knowledge on periodontal disease of a specifi c population, analyzing the impact of an educational and motivational talk. Materials and Methods: A descriptive study of longitudinal communitarian intervention was carried out in a sample of 301 patients in different companies from the Metropolitan Area of Medellin; an initial survey was completed, followed by an educational and motivational talk and a toothbrush and toothpaste were given to every participant. Afterwards, the initial survey was carried out to the same employees in order to evaluate the impact the intervention had and the level of acquired. Results: Knowledge increased 42,4% from 2,38 ± 0,78 to 3,39 ± 0,81. Conclusion: Signifi cant changes in learning about periodontal disease was achieved.Keywords: Gingivitis, Periodontitis, Level of knowledge

Contextualization: bean cultivation is considered an important component in cold climate farming systems because it offers multifunctional attributes [source of protein, rotation strategy, commercial option, etc.], which is why it is so common in the region of Nariño [Colombia]. Knowledge gap: knowledge about the biodiversity of this species must be expanded to facilitate a conservation strategy and the development of improvement programs. Purpose: to characterize phenotypically and classify 73 broad bean accessions collected in Nariño. Methodology: different bean seeds were collected in seven producer municipalities of Nariño. The accessions were planted in observation plots and evaluated using 19 quantitative descriptors. The results were analyzed using Pearson's correlation and Principal Component Analysis. In addition, a hierarchical grouping was carried out using Ward’s method. Results and conclusions: phenotypic diversity was evidenced in the collection. In addition, different associations between descriptors that were related to the species' compensation dynamics were described. In reference to the multivariate analysis, four groups with characteristics were generated, and they can be explored for conservation purposes, detection of materials with superior characteristics, or genetic improvement of the broad bean crop.