Resumo

VILLASENOR MIR, Héctor Eduardo et al. Losses caused by Zymoseptoria tritici in wheat genotypes in storm environments. Rev. Mex. Cienc. Agríc [online]. 2020, vol.11, n.3, pp.467-479.  Epub 30-Ago-2021. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v11i3.1788.

Leaf blight caused by Mycosphaerella graminicola (anamorph Zymoseptoria tritici or Septoria tritici), is a disease present in rainy areas of seasonal wheat crops in the High Valleys of Central Mexico. The effect on grain yield caused by the disease is variable, depending on the locality and the resistance level of the varieties. The objectives of the research were to determine the percentage of losses caused by leaf blight and the response of commercial varieties planted in storm environments. Five varieties of bread wheat were evaluated in two treatments, with and without control of the disease, in the towns of Juchitepec, State of Mexico and Nanacamilpa, Tlaxcala, during the summer 2007 and 2008 cycles. The experimental design was complete random blocks with four repetitions under split plot treatment arrangement. The decrease in yield caused by leaf blight was 41 and 40% in Salamanca S75 and Gálvez M87 respectively, 33% for Verano S91, Triunfo F2004 24% and 9% losses in Rebeca F2000. Based on their resistance level, three groups of varieties were determined: Rebeca F2000 as resistant, Triunfo F2004 moderately resistant, Gálvez M87, Salamanca S75 and Verano S91 susceptible. The best test site was Juchitepec, Estate from Mexico. These results indicate that greater resistance to Zymoseptoria should be incorporated in future varieties, including Rebeca F2000 as a source of resistance, which will reduce losses in farmers yield in environments where the disease is important.

Palavras-chave : Triticum aestivum; Zymoseptoria tritici; leaf blight; susceptible varieties; yield.

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