Monitoring of Brazilian wheat blast field populations reveals resistance to QoI, DMI, and SDHI fungicides

A - Papers appearing in refereed journals

Vicentini, S. N. C., Casado, P. S., DeCarvalho, G., Moreira, S. I., Dorgian, A. F., Silva, T. C., Silva, A. G., Custodio, A. P. A., Gomes, A. C. S., Maciel, J. L. N., Hawkins, N. J., McDonald, B. A., Fraaije, B. A. and Ceresini, P. C. 2021. Monitoring of Brazilian wheat blast field populations reveals resistance to QoI, DMI, and SDHI fungicides. Plant Pathology. https://doi.org/10.1111/ppa.13470

AuthorsVicentini, S. N. C., Casado, P. S., DeCarvalho, G., Moreira, S. I., Dorgian, A. F., Silva, T. C., Silva, A. G., Custodio, A. P. A., Gomes, A. C. S., Maciel, J. L. N., Hawkins, N. J., McDonald, B. A., Fraaije, B. A. and Ceresini, P. C.
Abstract

Wheat blast is one of the most important and devastating fungal diseases of wheat in South America, South-east Asia, and now in southern Africa. The disease can reduce grain yield by up to 70% and is best controlled using integrated disease management strategies. The difficulty in disease management is compounded by the lack of durable host resistance and the ineffectiveness of fungicide sprays. New succinate dehydrogenase inhibitor (SDHI) fungicides were recently introduced for the management of wheat diseases. Brazilian field populations of the wheat blast pathogen Pyricularia oryzae Triticum lineage (PoTI) sampled from different georgraphical regions in 2012and 2018 were shown to be resistant to both QoI (strobilurin) and DMI (azole) fungicides. The main objective of the current study was to determine the SDHI baseline sensitivity in these populations. Moderate levels of SDHI resistance were detected in five out of the six field populations sampled in 2012 and in most of the strains isolated in 2018. No association was found between target site mutations in the sdhB, sdhC, and sdhD genes and the levels of SDHI resistance, indicating that a pre-existing resistance mechanism not associated with target site mutations is probably present in Brazilian wheat blast populations.

KeywordsFluxapyroxad; Fungicide resistance; Nontarget site resistance; Pyricularia oryzae Triticum linage; Second-generation carboxiamides; Succinate dehydrogenase inhibitors
Year of Publication2021
JournalPlant Pathology
Digital Object Identifier (DOI)https://doi.org/10.1111/ppa.13470
Web address (URL)https://bsppjournals.onlinelibrary.wiley.com/doi/full/10.1111/ppa.13470
Open accessPublished as non-open access
FunderBBSRC Newton funding
Funder project or codeBB/S018867/2
Output statusPublished
Publication dates
Online12 Sep 2021
Publication process dates
Accepted18 Aug 2021
PublisherWiley
ISSN0032-0862

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