Examinando por Materia "Bacillus subtilis"

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Efecto de rizobacterias en el control de Rhizoctonia solani en el cultivo de papa
(Universidad Nacional Agraria La Molina, 2015-12-31) Arcos Pineda, Jesús; Zúñiga Dávila, Doris Elizabeth
En condiciones de clima frío y húmedo, una de las enfermedades más importantes que afecta al cultivo de papa es la rizoctoniasis causada por el hongo Rhizoctonia solani Kühn. Con el objetivo de evaluar el efecto de Rizobacterias Promotoras de Crecimiento de Plantas (PGPRs) en R. solani y la promoción de crecimiento de plantas en papa, se emplearon dos cepas de Bacillus subtilis (Bac17M8: T1 y Bac17M9: T2), nativas de la región altiplánica del Perú y B. amyloliquefaciens de Bolivia (T3); además, se evaluó suelo infestado con R. solani sin rizobacteria (T4) y sin rizobacteria ni presencia de R. solani (T5), en condiciones de invernadero. Las plántulas de la variedad Ccompis y Andina inoculadas con las tres cepas de PGPRs presentaron menor mortalidad (en promedio 18.90% y 12.13% en Ccompis y Andina, respectivamente) en comparación con las no inoculadas (28.02% y 19.89% en Ccompis y Andina, respectivamente). Así mismo, en ambas variedades, los tubérculos cosechados de las parcelas inoculadas con rizobacterias también presentaron menores valores de incidencia (en promedio 15.19% y 6.99% en Ccompis y Andina, respectivamente) y severidad (5.75 a 9.06% y 5.73 a 7.31% en Ccompis y Andina, respectivamente), en comparación con los tubérculos cosechados de la parcela no inoculada que presentaron incidencia de 25.24% y 12.78% en Ccompis y Andina, respectivamente, y una severidad mayor a 30%, en ambas variedades.
Efficiency of entomopathogenic bacteria and fungi on Oligonychus yothersi in vitro and on Persea americana Mill. plants
(Facultad de Agronomía de la Universidad del Zulia,, 2023-11-03) Parco Quinchori, Jhimy Andy; Valverde Rodriguez, Agustina; Cornejo, Antonio; Briceño, Henry; Barrionuevo, Laura; Romero, Javier
In the germplasm bank of 22 varieties of avocado (Persea Americana Mill.) belonging to the Fruit Horticultural Institute Investigation, HermilioValdizan National University (UNHEVAL)-Peru, it is common to observe a high population of the species Oligonychusyothersi, a phytophagous mite harmful to the crop. Controls with commercial acaricides are restricted in place, due to the presence of beehives installed in adjacent plots. The objective of this study was to evaluate the effect of four commercial formulations containing strains of Metarhiziumanisopliae and Beauveria bassiana and the toxins of Bacillussubtilis, Bacillus thuringiensis var.kurstaki (Btk) for the control of O. yothersi. The entomopathogenic products were evaluated in the field applying a randomized complete block design with five treatments and three replicates. In the laboratory, 500 adult mites were selected, placing 100 mites per Petri dish with three repetitions per treatment. It was found that the formulation Bacillus thuringiensis var.kurstaki under field conditions reduced the population incidence of mites by up to 98.07% in 49 days. In the laboratory, the B. subtilis and M. anisopliae formulations caused 100% mortality six days after application proving to be efficient control alternatives.
Inoculation of Bacillus subtilis in acidic soil amended with biochar and liming materials in maize cultivation
(Nature Publishing Group, 2025-08-06) Diaz Chuquizuta, Henry; Coral Cardenas, Sergio Axel; Arévalo Aranda, Yuri Gandhi; Sánchez Ojanasta, Martín; Diaz Chuquizuta, Percy; Ocaña Reyes, Jimmy Alcides; Solórzano Acosta, Richard Andi; Cuevas Giménez, Juan Pablo
The use of amendments in combination with Bacillus subtilis has been understudied as a strategy for rehabilitating acid soils and improving cropping systems. This study aimed to evaluate the effects of amendments and B. subtilis on the development, yield, and nutritional quality of the hard yellow maize Marginal 28 T variety. A randomized complete block design with a factorial arrangement was employed, considering five amendments, including biochar, alongside the application of B. subtilis. The combination of biochar and B. subtilis significantly increased plant and ear height (p < 0.01), achieved a grain yield of 4.11 t ha⁻¹, and reduced flowering time by seven days. Strong correlations were observed between male and female flowering (r = 0.99) and between stem diameter and leaf area (r = 0.95), indicating improved vegetative development. Soil pH and nutrient availability, such as phosphorus, were also enhanced. The combined use of amendments and B. subtilis optimizes yield and improves soil chemical properties. Thus, applying biochar and B. subtilis improves growth, yield, and soil quality, consolidating a promising strategy for sustainable agriculture in acid soils.