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Article

Antagonistic Potential of Native Trichoderma spp. against Phytophthora cinnamomi in the Control of Holm Oak Decline in Dehesas Ecosystems

Construction Engineering, University of Córdoba, Ed. Leonardo Da Vinci, Campus of Rabanales, 14071 Córdoba, Spain
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Authors to whom correspondence should be addressed.
Both authors equally contributed to the work.
Academic Editor: Benedetto T. Linaldeddu
Forests 2021, 12(7), 945; https://doi.org/10.3390/f12070945
Received: 3 June 2021 / Revised: 14 July 2021 / Accepted: 15 July 2021 / Published: 17 July 2021
(This article belongs to the Special Issue Adaptive Forest Management to Climatic Change)
Phytophthora root rot caused by the pathogen Phytophthora cinnamomi is one of the main causes of oak mortality in Mediterranean open woodlands, the so-called dehesas. Disease control is challenging; therefore, new alternative measures are needed. This study focused on searching for natural biocontrol agents with the aim of developing integrated pest management (IPM) strategies in dehesas as a part of adaptive forest management (AFM) strategies. Native Trichoderma spp. were selectively isolated from healthy trees growing in damaged areas by P. cinnamomi root rot, using Rose Bengal selective medium. All Trichoderma (n = 95) isolates were evaluated against P. cinnamomi by mycelial growth inhibition (MGI). Forty-three isolates presented an MGI higher than 60%. Twenty-one isolates belonging to the highest categories of MGI were molecularly identified as T. gamsii, T. viridarium, T. hamatum, T. olivascens, T. virens, T. paraviridescens, T. linzhiense, T. hirsutum, T. samuelsii, and T. harzianum. Amongst the identified strains, 10 outstanding Trichoderma isolates were tested for mycoparasitism, showing values on a scale ranging from 3 to 4. As far as we know, this is the first report referring to the antagonistic activity of native Trichoderma spp. over P. cinnamomi strains cohabiting in the same infected dehesas. The analysis of the tree health status and MGI suggest that the presence of Trichoderma spp. might diminish or even avoid the development of P. cinnamomi, protecting trees from the worst effects of P. cinnamomi root rot. View Full-Text
Keywords: P. cinnamomi; root rot; holm oak decline; forest resilience; Trichoderma spp.; antagonism; biocontrol; IPM P. cinnamomi; root rot; holm oak decline; forest resilience; Trichoderma spp.; antagonism; biocontrol; IPM
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MDPI and ACS Style

Ruiz-Gómez, F.J.; Miguel-Rojas, C. Antagonistic Potential of Native Trichoderma spp. against Phytophthora cinnamomi in the Control of Holm Oak Decline in Dehesas Ecosystems. Forests 2021, 12, 945. https://doi.org/10.3390/f12070945

AMA Style

Ruiz-Gómez FJ, Miguel-Rojas C. Antagonistic Potential of Native Trichoderma spp. against Phytophthora cinnamomi in the Control of Holm Oak Decline in Dehesas Ecosystems. Forests. 2021; 12(7):945. https://doi.org/10.3390/f12070945

Chicago/Turabian Style

Ruiz-Gómez, Francisco J., and Cristina Miguel-Rojas. 2021. "Antagonistic Potential of Native Trichoderma spp. against Phytophthora cinnamomi in the Control of Holm Oak Decline in Dehesas Ecosystems" Forests 12, no. 7: 945. https://doi.org/10.3390/f12070945

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