Dinámica microbial del suelo asociada a diferentes estrategias de manejo de Phytophthora cinnamomi Rands en aguacate

Gil, Joaquín Guillermo Ramírez; Sánchez, Darío Antonio Castañeda; Osorio, Juan Gonzalo Morales

doi:10.1590/s0034-737x2013000600009

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…Other elements, such as K, Mg, S and Si, have been found in high concentrations in pathogen‐suppressive soils (Broadbent & Baker, ; Byrt et al ., ; Lee & Zentmyer, ; Bekker et al ., ). The organic matter added as organic mulch or composted substrate improves physical and chemical soil properties, favours root and rhizosphere microflora populations, generation of functional roots and increases nutrient and water supply (Ramírez et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…Ramírez et al . () found that beneficial microbial populations in soil may significantly increase by organic matter addition and decrease after fungicide application. Ramírez et al .…”

Section: Discussionmentioning

confidence: 99%

“…Although known management practices may reduce adverse disease effects, they do not fully restore plant health and production when applied individually (Ramírez et al ., ). This is why an integrated disease management programme requires the combination of different strategies in order to succeed (Coffey, ; Drenth & Guest, ; Vidales & Alcantar, ; Ramírez et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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Production of avocado trees infected with Phytophthora cinnamomi under different management regimes

2016

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Avocado root rot is the most important disease of this fruit crop worldwide. This pathology may be caused by several biotic and abiotic agents, with the oomycete Phytophthora cinnamomi being the pathogen more frequently associated with poor phytosanitary conditions. There are disease control methods available that can reduce disease severity and allow plants to recover; however, they are not consistently and promptly applied. In addition, only chemical products are used by farmers as the preferred management method. This research aimed to evaluate different root rot management strategies in a commercial orchard. Data suggest that individual control methods are not as effective as when they are applied in combination, as in the T8 treatment (metalaxyl + mancozeb applied in drench; injection of potassium phosphite to each plant stem; potassium silicate applied in drench; addition of a layer of organic mulch and incorporation of 10 kg of composted substrate, both applied to the ground around the base of each tree). Using this strategy, the area under the disease progress curve for the avocado root rot was reduced by up to 68.6%, and the extra-quality avocado fruit class increased by as much as 44% compared to the diseased control plants (T0) (P < 0.01). With the combined treatment T8, farm income showed a 9.5-fold increase, probably due to an increase in the percentage of viable roots by up to 9.4-fold, which would have improved nutrient and water uptake.

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Section: Discussionmentioning

confidence: 97%

“…Ramírez et al . () found that beneficial microbial populations in soil may significantly increase by organic matter addition and decrease after fungicide application. Ramírez et al .…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Production of avocado trees infected with Phytophthora cinnamomi under different management regimes

2016

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“…Las poblaciones de microorganismos están altamente influenciadas por los exudados radicales que incluyen aminoácidos, ácidos grasos, nucleótidos, ácidos orgánicos, fenoles, reguladores de crecimiento, poliamidas, esteroles, azúcares y vitaminas (Wang et al, 2018;Ramírez et al, 2013), los cuales pueden ser modif icados a través de la interacción de las plantas con los microorganismos promotores de crecimiento vegetal (González y Fuentes, 2017).…”

Section: Efecto De La Aplicación De Microorganismos Benéficos En Las unclassified

Densidad de microorganismos en rizósfera de limón mexicano con HuangLongBing e inoculado con hongos micorrízicos arbusculares y bacterias benéficas en invernadero.

Mendoza-Hernández¹,

Quiñones-Aguilar²,

López-Ramírez³

et al. 2019

Terra

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Mexico is among the first producers of Mexican lime (Ml), with 2.5 million hectares per year. Currently, this agricultural activity is threatened by HuangLonBing (HLB), caused by the bacterium Candidatus Liberibacter asiaticus (CLas). The development of biotechnological strategies aimed at combating this disease is imperative in order to incorporate them into the current management. The objective of our study was to isolate and determine the abundance of total bacteria (B) and filamentous fungi (FF) in the rhizosphere of Ml plants infected with CLas, treated with Bacillus subtilis (BS) and Funneliformis mosseae (FM). A completely randomized experimental design was used in six treatments and five replicates with one and a half year old trees infected with CLas via bud grafting as follows: 1) monthly application of BS (5 × 105 CFU g-1 of substrate: BsCLas), 2) single application of FM (5 spores g-1 inoculum: FmCLas); 3) chemical fertilization without CLas (Q), 4) chemical fertilization with CLas (QCLas); 5) organic fertilization without CLas (O) and 6) organic fertilization with CLas (OCLas). Five rhizospheric samplings were carried out each 70 days after the first application (dafa) of the chemical and organic nutrition of after the inoculation of microorganisms. The populations of bacteria (B) and fungi (FF) were determined using the decimal dilution method, plating (AN and PDA) and CFU count. Statistical differences (Tukey’s, P ≤ 0.05) were found in the population dynamics of B and total FF in treatments infected with CLas, with regard to non-infected treatments. At 368 dafa, total substrate B were 7.4 × 105 CFU g-1 in treatment QCLas, in contrast, total substrate B were 2.67 × 106 CFU g-1 in treatment Q. The population dynamics of B was the most affected compared to that of FF. The inoculation of beneficial microorganisms or application of organic nutrition were unable to maintain total B populations.

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“…Es así como dentro de los micororganismos importantes en el suelo, se encuentran solubilizadores de fósforo como Pseudomonas fluorescens, Escherichia vuleris, Acinetobacter oreivorans y Streptomyces spp (Ramírez-Gil et al 2013;Prieto-Correal et al 2015;Cisneros-R et al 2016;Li et al 2018;Sanclemente et al 2017); biodegradadores de compuestos complejos como lignina, celulosa, quitina y peptidoglicanos (Escobar-Escobar et al 2012;Camacho et al 2014;Lin et al 2019); microorganismos como Trichoderma lignorum y T. harzianumf que son controladores de la podredumbre blanca; especies de bacillus con potencial para el control de la sigatoka negra (Blanco et al 2013) y para controlar la marchitez de aguacate (Ramírez-Gil et al 2013); bacterias promotoras del crecimiento como Pseudomonas fluorescens y Bacillus subtilis (Menjivar-Flores et al 2013); regulación del pH (Campo-Martínez et al 2014; Boafo et al 2020) y también mejoran la producción agrícola debido a que aumenta la disponibilidad de nutrientes en el suelo, por lo que se consideran un excelente complemento en las enmiendas orgánicas (Gutiérrez et al 2012;Recalde et al 2013;Clocchiatti et al 2020).…”

Section: Microorganismos Eficientesunclassified

La importancia de las enmiendas orgánicas en la conservación del suelo y la producción agrícola

Montoya

Mora

Vásquez

2019

recia

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Dinámica microbial del suelo asociada a diferentes estrategias de manejo de Phytophthora cinnamomi Rands en aguacate

Cited by 8 publications

References 22 publications

Production of avocado trees infected with Phytophthora cinnamomi under different management regimes

Production of avocado trees infected with Phytophthora cinnamomi under different management regimes

Densidad de microorganismos en rizósfera de limón mexicano con HuangLongBing e inoculado con hongos micorrízicos arbusculares y bacterias benéficas en invernadero.

La importancia de las enmiendas orgánicas en la conservación del suelo y la producción agrícola

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