In vivo sensitivity reduction of Puccinia triticina races, causal agent of wheat leaf rust, to DMI and QoI fungicides

Abstract

RESUMOPalavras-chave adicionais: IC 50 , fungicida resistência, fator de redução da sensibilidade.Experimentos foram conduzidos para determinar, in vivo a IC 50 e CI 9 0 pa ra fu ngicida s inibidores da demetila çã o (IDM)(tria zois) e inibidores da quinona externa (IQe) (estrobilurinas) a cinco raças de Puccinia triticina mais frequentes na safra 2007, no Sul do Brasil. Os experimentos fora m rea liza dos em câ ma ra de crescimento com plâ ntu la s de trigo. Os fu ngicida s IDMs fora m testa dos na s concentrações em mg/L de 0,0; 0,02; 0,2; 2,0; 20,0; 100,0 e 200,0 e os IQes nas concentrações de 0,0; 0,0001; 0,001; 0,01; 0,1, 1 e 10,0 mg de ingrediente activo/L de água. Os fungicidas foram aplicados preventivamente 24 horas antes da inoculação das plântulas com os Arduim, F.S.; Reis, E.M.; Barcellos, A.L.; Turra, C. Redução da sensibilidade de raças de Puccinia triticina, agente causal da ferrugem da folha do trigo, aos fungicidas DMI e QoI, in vivo. Summa Phytopathologica, v.38, n.4, p.306-311, 2012. Fungicides were preventively applied at 24 hours before the inoculation of seedlings with the fu nga l spores. T he effect of treatments wa s Arduim, F.S.; Reis, E.M.; Barcellos, A.L.; Turra, C. In vivo sensitivity reduction of Puccinia triticina races, causal agent of wheat leaf rust, to DMI and QoI fungicides.

Widespread distribution of resistance to triazole fungicides in Brazilian populations of the wheat blast pathogen

“…Resistance to triazoles was already reported in Brazilian populations of the wheat leaf rust pathogen P. triticina (Arduim et al, 2012) and the wheat powdery mildew pathogen B. graminis f. sp.…”

Lack of an Intron in Cytochrome b and Overexpression of Sterol 14α-Demethylase Indicate a Potential Risk for QoI and DMI Resistance Development in Neophysopella spp. on Grapes

“…Similarly, high control efficacy of QoIs has also been reported for P. pachyrhizi and Puccinia spp. (Arduim et al 2012;Emmitt et al 2018;Twizeyimana and Hartman 2017).…”

Puccinia coronata f. sp. avenae: a threat to global oat production

“…The polycyclic and airborne nature of rust fungi strongly resembles that of pathogens which have developed fungicide insensitivity in the past. Reduced sensitivity to demethylation inhibitor and quinone outside inhibitor fungicides has been detected in Puccinia triticina , the wheat leaf rust pathogen (Arduim et al ., ). Similarly, the monitoring of fungicide effectiveness for more than a decade in Phakopsora pachyrhizi , the causal agent of Asian soybean rust, demonstrated a reduction in fungicide sensitivity over time (Godoy et al ., ).…”