Host preference of Phytophthora infestans on potato and tomato in Colombia

Late blight disease, caused by the oomycete Phytophthora infestans, is the most limiting disease of potato and tomato worldwide. Differences in host preference on potato and tomato among isolates of P. infestans has been previously shown. In Colombia, tomato and potato are economically important, thus determining if isolates of P. infestans collected on potato represent a risk on tomato crops, and vice versa, is of critical concern. To assess host preference on potato and tomato, detached leaflets of three varieties of tomato (Chonto Aslam, Chonto Roble and Chonto Santa Cruz) and three varieties of potato (Perla Negra, Diacol Capiro and ICA Única) were inoculated with eight isolates of P. infestans that had been isolated from potato and eight that had been isolated from tomato in different regions of Colombia. Potato isolates were from the departments of Antioquia, Cundinamarca, and Nariño, while tomato isolates were from the departments of Antioquia, Boyacá, Caldas, and Risaralda. Lesion area and number of sporangia produced by each isolate on each host was determined seven days after inoculation. The results mainly suggest that isolates that had been collected on potato could represent a risk for tomato crops. This finding is of critical concern, given that there are no tomato varieties commercially available in Colombia, resistant or tolerant to P.infestans. Furthermore, the results confirmed that the tomato varieties evaluated (Chonto Aslam, Chonto Santa Cruz and Chonto Roble) are highly susceptible to P. infestans. On the contrary, there is not enough evidence to determine if the isolates collected on tomato represent a risk for potato crops

• Autores: Silva González, Tania Ivonne
• Tipo de recurso: Trabajo de grado de pregrado
• Fecha de publicación: 2018
• Institución: Universidad de los Andes
• Repositorio: Séneca: repositorio Uniandes
• Idioma: eng
• OAI Identifier: oai:repositorio.uniandes.edu.co:1992/39187
• Acceso en línea: http://hdl.handle.net/1992/39187
• Palabra clave: Phytophthora infestans; Patología vegetal; Papas (Tubérculos); Tomates; Microbiología
• Rights: openAccess
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/