Abstract

RODRIGUEZ-GARCIA, María Florencia; GONZALEZ-GONZALEZ, Miguel; HUERTA-ESPINO, Julio  and  SOLANO-HERNANDEZ, Salomón. Fungicides evaluation against yellow rust (Puccinia striiformis f. sp. hordei) in six barley cultivars. Rev. mex. fitopatol [online]. 2021, vol.39, n.3, pp.414-434.  Epub Dec 13, 2021. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.2106-5.

Yellow rust (YR) in barley has increased its importance in recent production seasons in Mexico. During the spring-summer 2018 cycle, the biological effectiveness of the fungicides Azoxistrobin 11.1% + Tebuconazole 18.4% and Tebuconazole 25% was evaluated on cultivars Apizaco, Esmeralda, Maravilla, Doña Josefa, AC Metcalfe, and ABI Voyager for control of YR, as well as their effect on grain yield under three rainfed environments. The variables measured were: days to heading and maturity, plant height, test weight, grain yield, final disease severity, and area under the disease progress curve. The analysis of variance showed significant variation for cultivars, final disease severity, fungicides, and localities (p≤0.01). The most effective product was Azoxistrobin 11.1% + Tebuconazole 18.4%. The highest grain yield was recorded in Doña Josefa (3,567 kg ha-1) with the application of Azoxystrobin 11.1% + Tebuconazole 18.4%. Yield losses reached 53% due to the rust effect. A higher grain yield and test weight were obtained with the application of any of the two fungicides evaluated; however, cultivars responded differently to the application of the products.

Keywords : resistance; yield; cultivars; efficacy; Hordeum vulgare.