In vitro and in-planta evaluation of fungicides in controlling Harringtonia lauricola, the causal agent of laurel wilt disease in avocado

dc.contributor.advisorNavia Urrutia, Monica
dc.contributor.advisorMuñoz Perea, Carlos German
dc.contributor.authorLugo Duque, Maria de los Angeles
dc.contributor.googlescholarLugo Duque, Maria de los Angeles [CWUstcYAAAAJ]
dc.contributor.googlescholarNavia Urrutia, Monica [Ma2ZAeUAAAAJ]
dc.contributor.googlescholarMuñoz Perea, Carlos German [fFjy4S0AAAAJ&hl=es&oi=ao]
dc.contributor.orcidLugo Duque, Maria de los Angeles [0009000201302281]
dc.contributor.orcidNavia Urrutia, Monica [000000015280464X]
dc.contributor.orcidMuñoz Perea, Carlos German [0000000299034424]
dc.date.accessioned2026-02-24T21:20:13Z
dc.date.available2026-02-24T21:20:13Z
dc.date.issued2026
dc.descriptionIlustraciones, fotografías a color, tablas
dc.description.abstractLa marchitez del laurel es una enfermedad vascular letal causada por Harringtonia lauricola, un simbionte nutricional de varios escarabajos ambrosíales, que representa una seria amenaza para los huertos comerciales de aguacate. Actualmente, su manejo depende principalmente de prácticas culturales, ya que el único fungicida aprobado, Propiconazole, presenta una efectividad limitada. Con el objetivo de identificar fungicidas adicionales que contribuyan al control de esta enfermedad, se evaluaron de manera in vitro cinco ingredientes activos pertenecientes a tres diferentes grupos FRAC, en seis distintas dosis, para determinar sus valores efectivos (EC50 y EC95) en la inhibición del crecimiento de H. lauricola. A partir de los resultados, y considerando la movilidad de los compuestos, se seleccionaron formulaciones con Flutriafol y Mefentrifluconazole para realizar pruebas en planta, utilizando Propiconazole como tratamiento control. Los fungicidas se aplicaron mediante riego directo al sustrato de plantas de aguacate en maceta, con 15 meses de edad, empleando dos concentraciones (1X = 2400 mg/L y 3X =7200 mg/L), en tres aplicaciones espaciadas a intervalos de dos semanas. Dos semanas después de la última aplicación, la mitad de las plantas tratadas se inocularon con una suspensión de esporas de H. lauricola. A los 35 días, únicamente las plantas no tratadas y una planta del tratamiento 1X con Mefentrifluconazole presentaron síntomas externos de la enfermedad. No se logró recuperar el patógeno de las plantas tratadas con Flutriafol o Propiconazole. Además, un análisis de residuos en el tejido de los tallos mostró que el Flutriafol presentó las concentraciones más altas acumuladas (superiores a 300 mg/L en el tratamiento 3X), mientras que el Mefentrifluconazole no superó los 4 mg/L. Estos resultados sugieren que el Flutriafol tiene un alto potencial para el manejo de la marchitez del laurel, lo que justifica la realización de ensayos adicionales bajo condiciones de campo para confirmar su eficacia y aplicación práctica (Texto tomado de la fuente).spa
dc.description.abstractLaurel wilt is a lethal vascular disease caused by Harringtonia lauricola, a nutritional symbiont of several ambrosia beetles, posing a serious threat to commercial avocado orchards. Currently, its management relies mainly on cultural practices, as the only approved fungicide, propiconazole, has limited effectiveness. To identify additional fungicides that could aid in disease control, five active ingredients from three different FRAC groups were evaluated in vitro at six concentrations to determine their effective concentrations (EC50 and EC95) in inhibiting the growth of H. lauricola. Based on the results and considering the mobility of the compounds, formulations containing Flutriafol and Mefentrifluconazole were selected for in planta studies, with Propiconazole included as a control treatment. The fungicides were applied via drench to 15-month-old potted avocado plants at two concentrations (1X = 2400 mg/L and 3X = 7200 mg/L), with three applications at two-week intervals. Two weeks after the final application, half of the treated plants were inoculated with a spore suspension of H. lauricola. After 35 days, only the untreated plants and one plant in the 1X Mefentrifluconazole treatment showed external symptoms of the disease. H. lauricola was not recovered from plants treated with Flutriafol or Propiconazole. Furthermore, residue analysis in stem tissue revealed that flutriafol reached the highest concentrations (over 300 mg/L in the 3X treatment), while Mefentrifluconazole remained below 4 mg/L. These results suggest that flutriafol has strong potential for managing laurel wilt, supporting the need for additional field trials to confirm its efficacy and practical application.eng
dc.description.curricularareaCiencias Agropecuarias.Sede Palmira
dc.description.degreelevelMaestría
dc.description.degreenameMagister en Ciencias Agrarias
dc.description.methodsCon el objetivo de identificar fungicidas adicionales que contribuyan al control de esta enfermedad, se evaluaron de manera in vitro cinco ingredientes activos pertenecientes a tres diferentes grupos FRAC, en seis distintas dosis, para determinar sus valores efectivos (EC50 y EC95) en la inhibición del crecimiento de H. lauricola. A partir de los resultados, y considerando la movilidad de los compuestos, se seleccionaron formulaciones con Flutriafol y Mefentrifluconazole para realizar pruebas en planta, utilizando Propiconazole como tratamiento control. Los fungicidas se aplicaron mediante riego directo al sustrato de plantas de aguacate en maceta, con 15 meses de edad, empleando dos concentraciones (1X = 2400 mg/L y 3X =7200 mg/L), en tres aplicaciones espaciadas a intervalos de dos semanas. Dos semanas después de la última aplicación, la mitad de las plantas tratadas se inocularon con una suspensión de esporas de H. lauricola.
dc.description.notesSupplementary article to this thesis: Flutriafol as a Promising Fungicide for the Management of Laurel Wilt in Avocado Production: https://apsjournals.apsnet.org/doi/10.1094/PHP-02-25-0050-RSeng
dc.description.researchareaProteccion de cultivos
dc.format.extentxi, 58 páginas
dc.format.mimetypeapplication/pdf
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/89667
dc.language.isoeng
dc.publisherUniversidad Nacional de Colombia
dc.publisher.branchUniversidad Nacional de Colombia - Sede Palmira
dc.publisher.facultyFacultad de Ciencias Agropecuarias
dc.publisher.placePalmira, Valle, Colombia
dc.publisher.programPalmira - Ciencias Agropecuarias - Maestría en Ciencias Agrarias
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.rights.licenseReconocimiento 4.0 Internacional
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject.agrovocControl de enfermedades de plantas
dc.subject.agrovocPlant disease control
dc.subject.agrovocControl químico de enfermedades
dc.subject.agrovocChemical disease control
dc.subject.agrovocSanidad vegetal
dc.subject.agrovocEnfermedad vascular
dc.subject.agrovocVascular disease
dc.subject.agrovocIn vitro
dc.subject.agrovocPatogenicidad
dc.subject.agrovocPathogenicity
dc.subject.ddc630 - Agricultura y tecnologías relacionadas::632 - Lesiones, enfermedades, plagas vegetales
dc.subject.proposalLaurel wilteng
dc.subject.proposalMarchitez del laurelspa
dc.subject.proposalFungicideseng
dc.subject.proposalFungicidasspa
dc.subject.proposalFlutriafoleng
dc.subject.proposalFlutriafolspa
dc.subject.proposalIn vitro evaluationeng
dc.subject.proposalEvaluacion In vitrospa
dc.subject.proposalPathogen growth inhibitioneng
dc.subject.proposalInhibicion de crecimiento del patogenospa
dc.subject.proposalFungicide translocationeng
dc.subject.proposalTranslocacion de Fungicidasspa
dc.subject.proposalAvocadoeng
dc.subject.proposalAguacatespa
dc.titleIn vitro and in-planta evaluation of fungicides in controlling Harringtonia lauricola, the causal agent of laurel wilt disease in avocadoeng
dc.title.translatedEvaluación in vitro y en planta de fungicidas para el control de Harringtonia lauricola, agente causal de la marchitez del laurel en aguacatespa
dc.typeTrabajo de grado - Maestría
dc.type.coarhttp://purl.org/coar/resource_type/c_bdcc
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.contentText
dc.type.contentText
dc.type.driverinfo:eu-repo/semantics/masterThesis
dc.type.redcolhttp://purl.org/redcol/resource_type/TM
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
dcterms.audience.professionaldevelopmentEstudiantes
dcterms.audience.professionaldevelopmentInvestigadores
dcterms.audience.professionaldevelopmentEspecializada
dcterms.audience.professionaldevelopmentMaestros
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2
oaire.fundernameUniversity of Florida
oaire.fundernameUSDA-NIFA-SCRI
oaire.fundernameUSDA-IR4

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