Pyridachlometyl has a novel anti-tubulin mode of action which could be useful in anti-resistance management

Matsuzaki, Y.; Watanabe, S.; Harada, T.; Iwahashi, F.

Pest Management Science 76(4): 1393-1401

2020


ISSN/ISBN: 1526-4998
PMID: 31622533
DOI: 10.1002/ps.5652
Accession: 069427466

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Abstract
Fungicide resistance is a growing problem affecting many crop pathogens owing to the low success rate in finding novel chemical classes of fungicides. Pyridachlometyl is a new fungicide that seems to belong to a new chemical class of tubulin polymerization promoters. Pyridachlometyl exhibited potent antifungal activity against a broad range of fungal species belonging to the phyla Ascomycota and Basidiomycota. No cross-resistance was observed with other fungicide classes, such as ergosterol biosynthesis inhibitors, respiratory inhibitors, or tubulin polymerization inhibitors in Zymoseptoria tritici. Pyridachlometyl-resistant strains were obtainable by UV mutagenesis in Z. tritici and Penicillium digitatum. Mutations in tubulin-coding genes were found in all laboratory mutants but the patterns of mutation were distinct from that of tubulin polymerization inhibitors, such as benzimidazole fungicides. Pyridachlometyl is a promising new tool for disease control. However, strict resistance management strategies should be recommended for the practical use of pyridachlometyl. © 2019 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.