Airborne inoculum dynamics of Polystigma amygdalinum and progression of almond red leaf blotch disease in Catalonia, NE Spain
Pons-Solé, Gemma (Universitat Autònoma de Barcelona. Laboratori de Fisiologia Vegetal)
Miarnau, Xavier (Institut de Recerca i Tecnologia Agroalimentàries)
Torguet, Laura (Institut de Recerca i Tecnologia Agroalimentàries)
Lázaro, Elena (Institut Valencià d'Investigacions Agràries)
Vicent, A. (Institut Valencià d'Investigacions Agràries)
Luque, Jordi (Institut de Recerca i Tecnologia Agroalimentàries)

Data:	2023
Resum:	The dynamics of airborne ascospores and disease progress of red leaf blotch (RLB) of almond, caused by Polystigma amygdalinum, and their correlations with weather variables were studied from 2019 to 2021 in two almond orchards located in Lleida, NE Spain. Airborne ascospores were detected and quantified by real-time qPCR using species-specific primers for P. amygdalinum. Ascospores were detected mainly from April to June, with a high variability between the yearly cumulative concentrations. Positive significant correlations were found between the weekly proportion of airborne ascospores and the number of wet and mild days-either combined or separated- accumulated rainfall, number of rainy days, accumulated low temperatures on wet days, and mean and maximum relative humidity. In contrast, several thermal variables (maximum temperature, VPD, and number of warm days) were negatively correlated with ascospore catches. Positive significant correlations were found between the cumulative proportion of ascospores and RLB incidence and severity. Weekly variations in RLB incidence and severity showed significant positive correlations with the number of warm days while negative with the number of mild days. Severity was also positively correlated with several thermal variables (mean, maximum, and minimum temperature, and VPD), and negatively correlated with the number of cold days and wet and mild days. Stronger correlations were generally found with ascospore catches or disease progress when using concurrent weekly weather data. Gompertz, monomolecular, and logistic growth models were evaluated to describe RLB disease progress.
Ajuts:	Ministerio de Economía, Industria y Competitividad RTA2017-00009-C04-01 Agencia Estatal de Investigación PID2020-114648RR-C31 Agencia Estatal de Investigación PRE2018-085207
Nota:	Altres ajuts: acords transformatius de la UAB
Nota:	Altres ajuts: CERCA Program, Generalitat de Catalunya
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Annals of Applied Biology, Vol. 183, Issue 1 (July 2023) , p. 33-42, ISSN 1744-7348

DOI: 10.1111/aab.12831

10 p, 2.6 MB

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