espanolEn los Departamentos de Narino y Putumayo, desde el ano 2003 se ha venido presentando un disturbio de aparente etiologia viral atacando cultivos de frijol perenne (Phaseolus polyanthus Greenman) con sintomas de clorosis, distorsion de hojas, ampollamientos y retardo del crecimiento. La realizacion de este trabajo se hizo en el invernadero y el laboratorio de Entomologia de la Universidad de Narino, Pasto, Colombia, a 2.600 msnm, y una temperatura promedio de 20o C. Las pruebas de transmision mecanica, por afidos y semilla, permitieron establecer que la eficiencia de transmision mecanica en frijol (P. polyanthus) fue del 93% con un punto final de dilucion de 10-5, con un periodo de incubacion de 10 dias, por semilla se presento con una eficiencia del 66% y con el afido Picturaphis vignaphilus Blanchard con un periodo de adquisicion de 2 minutos y 93% de eficiencia. En pruebas realizadas con otras especies de plantas se establecio que en frijol comun (Phaseolus vulgaris L) se presento transmision mecanica del 83% y por afido del 53%, en haba (Vicia faba L) unicamente se presento transmision mecanica del 33%. Examenes de microscopia electronica revelaron presencia de particulas de 700 x 15 nm, de forma flexuosa. EnglishIn the departments of Narino and Putumayo, since 2003 has been presenting a disturbance of apparent viral etiology attacking perennial bean (Phaseolus polyanthus Greenman) with symptoms of generalized yellowing, distortion of leaves, shoots and rugose mosaic and growth retardation. The completion of this work was done in the greenhouse and the laboratory of entomology at the University of Narino, Pasto, Colombia, 2,600m, and an average temperature of 20°C. For the identification was made by collection of infected material for testing mechanical inoculation, aphid and seed transmission. Being able to establish that the efficiency of mechanical transmission in bean Phaseolus polyanthus Greenman is 90% with an end point dilution of 105, its incubation period is 10 days,seed transmission was presented with an efficiency of 66% and the aphid vector was Picturaphis vignaphilus Blanchard with a period acquisition of 2 minutes and 93% efficiency of transmission. In tests with other species was established that in common bean (Phaseolus vulgaris L). is presented mechanical transmission of 83% and 53% by aphid in bean (Vicia faba L) was presented only 33% mechanical transmission, electron microscopy examinations revealed particles 700 x 15nm, shape flexuosa.