La caracterización fenotípica y genotípica de individuos de Phytophthora infestans, causante del tizón tardío en cultivos de papa, Solanum tuberosum L., en zonas altoandinas del Perú, se realizó con el objetivo de conocer su diversidad fenotípica respecto al tipo de apareamiento, respuesta a metalaxyl y virulencia, y su diversidad genotípica relacionada al haplotipo mitocondrial y genotipo; para determinar la estructura poblacional y diversidad genética de P. infestans en los Andes Peruanos en 2016 y 2017. Para ello, se muestrearon 117 campos afectados en Piura (24), Cajamarca (10), Amazonas (10), La Libertad (4), Ancash (18), Huánuco (11), Junín (19), Huancavelica (10) y Cusco (11), mediante un muestreo aleatorio de 1 a 5 puntos por campo. En cada punto se colectaron 2 muestras de tejido vegetal infectado con una sola lesión, obteniendo 701 muestras. De ellas, se selecciona...

Endophytic fungi (EF) are microorganisms that live asymptomatically within plant tissues. They can confer benefits to the plant as inducers of resistance to pests and diseases, tolerance to abiotic factors, plant growth promoters and mycoparasites of pathogens. This study aimed to isolate, identify, and determine occurrence frequency of endophytic fungi in stems and leaves of blueberry plants collected from ten farms in Lima and Ica Region, Peru. Productive branches of 39 healthy plants were sampled. For the isolation of EF, 702 tissue sections were disinfected and transferred to Petri dishes with potato dextrose agar (PDA) medium, and reproductive structures were induced for identification. A total of 134 EF strains were isolated successfully. Nine genera were identified (Trichoderma, Aspergillus, Alternaria, Ulocladium, Cladosporium, Fusarium, Nigrospora, Lasiodiplodia and Stemphylium)...