Abstract
Metyltetraprole is a novel quinone outside inhibitor (QoI) fungicide designed to avoid cross-resistance in cytochrome b G143A-harboring QoI-resistant phytopathogenic fungi. The resistance factors of G143A-harboring fungal isolates for metyltetraprole are around 1, but > 200 for the reference QoI fungicide azoxystrobin. In this study of metyltetraprole activities against azoxystrobin-resistant isolates carrying G137R, G137S, L299F, N256S + L299F, or L275F + L299F in cytochrome b, metyltetraprole had potent activity against all isolates with these cytochrome b haplotypes. The resistance factors ranged from 0.7 to 2.9 for metyltetraprole and from 3.0 to 175.1 for azoxystrobin. We revealed unique metyltetraprole inhibitory activities against QoI-resistant plant pathogens.
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