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espanolEl cultivo de papa en el Ecuadores afectado por limitantes de origen biotico dentro de las cuales el tizon tardio (Phytophthora infestans), larizoctoniasis (Rhizoctoniasolani) y el pie negro (Pectobacteriumsp) en los ultimos anos se han convertido en limitantes importantes del cultivo. El objetivo de esta investigacion fue evaluar la respuesta en los genotipos UCE Premium y UCE Allipacha con sus respectivos controles (tolerante y susceptible) en relacion al ataque de estos patogenos. Para P. infestans se calculo el area bajo la curva de progreso relativo de la enfermedad (ABCPEr) ; en laboratorio se midio el rango de crecimiento de la lesion (RCL) y el tamano de lesion (TL). Mientras que para rizoctoniasis se midio la incidencia y el rendimiento. Para pie negro se evaluo el volumen de pudricion y se establecio su grado de resistencia. INIAP Libertad y UCE Allipacha presentaron menor ABCPEr en campo con valores de 0.02 y 0.03, una RCL de 7.84 y 7.19 mm2 y un TL 54.87, 54.46 mm2 respectivamente. Para R.solani , no hubo efecto sobre el rendimiento, para incidencia sobresalieron INIAP-Puca Shungo e INIAP-Victoria con los valores mas bajos 25.25% y 35.5%. El volumen de pudricion de Pectobacterium sp en INIAP-SantaCatalina e INIAP-Victoria presentaron mayor volumen de pudricion en tuberculos con 19.07 ml y 18.50 ml respectivamente, mientras que UCE Premium presento el menor volumen de pudricion de tuberculo con 8.42ml. Existio variacion de la respuesta al ataque de los patogenos en los genotipos de papa evaluados EnglishPotato crop in Ecuador is affected by different limitations of biotic origin among them late blight Phytophthora infestans rhizoctoniasis Rhizoctonia solani and blackleg Pectobacterium sp In recent years, these limitations have become important factor to the crop. The objective of this research was to evaluate the response of UCE Premium and UCE Allipacha with their respe ctive controls (tolerant and susceptible) to these pathogens. For P. infestans under field conditions the relative area under the progress curve of the disease ( was calculated and the lesion growth rate ( and the size of the lesion ( were m easured in the laboratory. While, for rhizoctoniasis, incidence and yield were assessed. For blackleg, the tuber rot volume was evaluated and its resistance degree was established. INIAP Libertad and UCE Allipacha had lower ABCPEr in the field with values of 0.02 and 0.03, a LGT of 7.84 and 7.19 mm 2 and a TL 54.87, 54.46 mm 2 respectively. For R. solani there was no effect on yield, for incidence INIAP Puca Shungo and INIAP Victoria showed the lowest values with 25.25% and 35.5%, respectively. The rot t uber volume of Pectobacterium sp for INIAP Santa Catalina and INIAP Victoria was 19.07 ml and 18.50 ml respectively, while UCE Premium presented the lowest rot tuber volume 8.42 ml. There was variation in the response attack of these pathogens in the pota to genotypes.

Respuesta de UCE -Premium y UCE Allipacha al ataque de Phytophthora infestans, Rhizoctonia solani y Pectobacterium sp.