Downy mildew is the most important disease that affects quinoa (Chenopodium quinoa Willd.) in the Peruvian altiplano, it’s caused by pseudo fungi Peronospora variabilis Gäum. It causes yield reductions up to 99%. With the purpose of evaluating the effect of Trichoderma sp strains with endophytic capacity in the control of the mildew and improve quinoa yield var. Salcedo INIA, the seeds were fully covered (1x106 ufc. seed-1) and substrate was infested with spores of 10 Trichoderma strains to determine the percentage of endophytic colonization in quinoa plants at 30 and 60 days age under controlled conditions;four leaf applications (1x107 ufc.ml-1) and severity evaluations were also performed to determine the area under the disease progress curve (AUDPC) and grain yield under field conditions. All the strains managed to colonize different parts of the ...

A series of fungi diseases severe is disseminated by avocado seeds and they can decrease the production in approximately 14% and a reduction of quality in 10%. The present investigation consisted in to isolate and identify pathogens fungal present in the avocado seeds mexican race used for patron. The fotopatogenos fungi were isolated in culture medium Sucrose Agar Potato from the embryo and cotyledon of 200 seeds of avocado and to identify with taxonomic keys also was carried out Pathogenicity test on avocado plants with the most frequent phytopathogenic fungi. The pathogens fungal isolated and identified from embryo and cotyledon of seeds were Lasiodiplodia sp. with 0.5% and 1.00%, and Fusarium sp with 1.50% and 2.50% of frecuency respectively. The pathogenicity test allowed confirming that Lasiodiplodia theobromae and Fusarium verticillioides affect to seedlings of avocado, being th...

Downy mildew is the most important disease that affects quinoa (Chenopodium quinoa Willd.) in the Peruvian altiplano, it’s caused by pseudo fungi Peronospora variabilis Gäum. It causes yield reductions up to 99%. With the purpose of evaluating the effect of Trichoderma sp strains with endophytic capacity in the control of the mildew and improve quinoa yield var. Salcedo INIA, the seeds were fully covered (1x106 ufc. seed-1) and substrate was infested with spores of 10 Trichoderma strains to determine the percentage of endophytic colonization in quinoa plants at 30 and 60 days age under controlled conditions;four leaf applications (1x107 ufc.ml-1) and severity evaluations were also performed to determine the area under the disease progress curve (AUDPC) and grain yield under field conditions. All the strains managed to colonize different parts of the ...

A series of fungi diseases severe is disseminated by avocado seeds and they can decrease the production in approximately 14% and a reduction of quality in 10%. The present investigation consisted in to isolate and identify pathogens fungal present in the avocado seeds mexican race used for patron. The fotopatogenos fungi were isolated in culture medium Sucrose Agar Potato from the embryo and cotyledon of 200 seeds of avocado and to identify with taxonomic keys also was carried out Pathogenicity test on avocado plants with the most frequent phytopathogenic fungi. The pathogens fungal isolated and identified from embryo and cotyledon of seeds were Lasiodiplodia sp. with 0.5% and 1.00%, and Fusarium sp with 1.50% and 2.50% of frecuency respectively. The pathogenicity test allowed confirming that Lasiodiplodia theobromae and Fusarium verticillioides affect to seedlings of avocado, being th...

The use of endophytic fungi is an effective alternative to control pathogens, improve plant metabolism and yield in crops. The objective of this study was to assess the effect of five different strains of Trichoderma sp. on the growth and yield of quinoa plants (Chenopodium quinoa Willd) by using two methods of inoculation: a) pelleted seed, and b) drenching with the endophytic fungi. A completely randomized design with a 2 x 5 factorial arrangement, plus a control with five repetitions was used. The 11 treatments were evaluated with five repetitions. Yield, and aerial and root growth variables were determined. There were no interactions between strains and inoculation methods for aerial plant growth, but there were for root growth and yield. The seed pelleting method produced a higher aerial growth compared to the drench method. In root length, the greatest values were found with the TE...

Downy mildew is the most important disease that affects quinoa (Chenopodium quinoa Willd.) in the Peruvian altiplano, it’s caused by pseudo fungi Peronospora variabilis Gäum. It causes yield reductions up to 99%. With the purpose of evaluating the effect of Trichoderma sp strains with endophytic capacity in the control of the mildew and improve quinoa yield var. Salcedo INIA, the seeds were fully covered (1x106 ufc. seed-1) and substrate was infested with spores of 10 Trichoderma strains to determine the percentage of endophytic colonization in quinoa plants at 30 and 60 days age under controlled conditions;four leaf applications (1x107 ufc.ml-1) and severity evaluations were also performed to determine the area under the disease progress curve (AUDPC) and grain yield under field conditions. All the strains managed to colonize different parts of the ...

A series of fungi diseases severe is disseminated by avocado seeds and they can decrease the production in approximately 14% and a reduction of quality in 10%. The present investigation consisted in to isolate and identify pathogens fungal present in the avocado seeds mexican race used for patron. The fotopatogenos fungi were isolated in culture medium Sucrose Agar Potato from the embryo and cotyledon of 200 seeds of avocado and to identify with taxonomic keys also was carried out Pathogenicity test on avocado plants with the most frequent phytopathogenic fungi. The pathogens fungal isolated and identified from embryo and cotyledon of seeds were Lasiodiplodia sp. with 0.5% and 1.00%, and Fusarium sp with 1.50% and 2.50% of frecuency respectively. The pathogenicity test allowed confirming that Lasiodiplodia theobromae and Fusarium verticillioides affect to seedlings of avocado, being th...

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)...

El mildiu ocasionado por el pseudohongo Peronospora variabilis Gäum., es la enfermedad más importante que afecta a la quinua (Chenopodium quinoa Willd.) en el altiplano peruano, causando una reducción en su rendimiento de hasta 99%. Con la finalidad de evaluar el efecto de 10 cepas nativas de Trichoderma sp con capacidad endofitica en el biocontrol del mildiu de la quinua var. Salcedo INIA, se peletizaron semillas e infestaron el sustrato con esporas de cepas de Trichoderma aisladas de quinua (T1, T2, T3, T4 y T5) y cacao (T6, T7, T8, T9 y T10) en el Laboratorio de Fitopatología de la Universidad Nacional del Altiplano en Puno (UNA) - Perú para determinar el índice y porcentaje de colonización endofitica en plantas de quinua. a los 30 y 60 días de evaluación. Asimismo, en el Centro de Investigación y Producción Camacani de la UNA se sembraron semillas peletizadas con esporas d...

Downy mildew is the most important disease that affects quinoa (Chenopodium quinoa Willd.) in the Peruvian altiplano, it’s caused by pseudo fungi Peronospora variabilis Gäum. It causes yield reductions up to 99%. With the purpose of evaluating the effect of Trichoderma sp strains with endophytic capacity in the control of the mildew and improve quinoa yield var. Salcedo INIA, the seeds were fully covered (1x106 ufc. seed-1) and substrate was infested with spores of 10 Trichoderma strains to determine the percentage of endophytic colonization in quinoa plants at 30 and 60 days age under controlled conditions;four leaf applications (1x107 ufc.ml-1) and severity evaluations were also performed to determine the area under the disease progress curve (AUDPC) and grain yield under field conditions. All the strains managed to colonize different parts of the ...

A series of fungi diseases severe is disseminated by avocado seeds and they can decrease the production in approximately 14% and a reduction of quality in 10%. The present investigation consisted in to isolate and identify pathogens fungal present in the avocado seeds mexican race used for patron. The fotopatogenos fungi were isolated in culture medium Sucrose Agar Potato from the embryo and cotyledon of 200 seeds of avocado and to identify with taxonomic keys also was carried out Pathogenicity test on avocado plants with the most frequent phytopathogenic fungi. The pathogens fungal isolated and identified from embryo and cotyledon of seeds were Lasiodiplodia sp. with 0.5% and 1.00%, and Fusarium sp with 1.50% and 2.50% of frecuency respectively. The pathogenicity test allowed confirming that Lasiodiplodia theobromae and Fusarium verticillioides affect to seedlings of avocado, being th...

La quinua es un cultivo con alto potencial económico y social en la Región Puno, Perú; sin embargo, su producción está afectada por la baja fertilidad de los suelos. Una forma de enfrentar este problema sin afectar el ambiente es mediante el uso de microorganismos benéficos. El objetivo de este estudio fue evaluar el efecto de cepas de Trichoderma sp. en la nutrición de la quinua var. Salcedo INIA y en las características químicas del suelo. La investigación se desarrolló en el Laboratorio de Fitopatología e instalaciones de la Escuela Profesional de Ingeniería Agronómica, ubicado en la ciudad de Puno durante los meses de enero a julio de 2015. Se emplearon cinco cepas de Trichoderma sp. para la inoculación en plantas de quinua mediante la aplicación al suelo o usando semilla peletizada. Al final del ciclo del cultivo (seis meses) se evaluaron los niveles de N, P y K tant...