Metyltetraprole, a novel putative complex III inhibitor, targets known QoI‐resistant strains of Zymoseptoria tritici and Pyrenophora teres

• Published in: Pest management science 2019-04, Vol.75 (4), p.1181-1189
• Main Authors: Suemoto, Haruka, Matsuzaki, Yuichi, Iwahashi, Fukumatsu
• Format: Article
• Language: English
• Subjects: Antifungal activity; antifungal properties; Biological activity; Cereal crops; Chains; Demethylation; Disease control; Electron transport; electron transport chain; enzyme inhibitors; Field tests; Fungal diseases; fungi; Fungicides; grain crops; Inhibitors; Metyltetraprole; Mitochondria; mutants; Mycosphaerella graminicola; Organic chemistry; pathogens; Pest control; pyraclostrobin; Pyrenophora teres; QoI; Quinones; resistance management; Resistant mutant; Seedlings; sterols; Succinate dehydrogenase; succinate dehydrogenase (quinone); Zymoseptoria tritici
• ISSN: 1526-498X; 1526-4998
• DOI: 10.1002/ps.5288

BACKGROUND Metyltetraprole is a new fungicide with a unique tetrazolinone‐moiety and a similar side chain to a known quinone outside inhibitor (QoI), pyraclostrobin. In this study we describe a unique bioactivity of metyltetraprole on QoI‐resistant strains of Zymoseptoria tritici and Pyrenophora teres. RESULTS Metyltetraprole exhibited potent antifungal activity against Ascomycetes; it was especially effective against Z. tritici and P. teres in seedling pot tests. Metyltetraprole was also effective in field tests with QoI‐resistant mutants. Antifungal activity tests using field strains of Z. tritici and P. teres showed that the performance of metyltetraprole was unaltered by QoI, succinate dehydrogenase inhibitor (SDHI), and sterol 14α‐demethylation inhibitor (DMI) resistance. However, the mitochondrial activity test indicated that the compound inhibits the respiratory chain via complex III. CONCLUSION Metyltetraprole is a novel fungicide that is highly effective against a wide range of fungal diseases, including important cereal diseases. Although metyltetraprole most likely inhibits the respiratory chain via complex III, it remains effective against QoI resistant strains. Therefore, metyltetraprole is considered as a novel fungicidal agent for controlling diseases affecting cereal crops and overcoming pathogen resistance to existing fungicides. © 2018 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. Metyltetraprole, a new putative complex III inhibitor for the management of major diseases affecting cereal crops, is effective against existing resistant fungal pathogens.