Response of oat genotypes to infection by Puccinia graminis f. sp. Avenae in the high valleys of Mexico
DOI:
https://doi.org/10.29312/remexca.v9i2.1074Keywords:
Avena sativa, Puccinia graminis f. sp. avenae, fungicide, severityAbstract
Stem rust of oats, caused by Puccinia graminis f. sp. avenae, has increased its incidence and severity significantly in temporal plots distributed in the high valleys of Mexico. The objective of this study was to determine the response of 28 temperate oats genotypes to Puccinia graminis f. sp. avenae infection under field conditions, during the spring-summer 2013 and 2014 cycles. A completely randomized experimental design was used with four replications, and an arrangement of treatments in divided plots. The large plots were five planting dates and the small plots consisted of the 28 oat genotypes. The response variable was the percentage of stem rust damage in each of the genotypes, from the beginning of the disease to the end of each crop cycle. The variety of oats most resistant to stem rust was Diamond R-31, followed by Nodaway, AB177 and Teporaca. While the most susceptible varieties were Guelatao, Tulancingo and Ópalo. Likewise, planting dates 1 (June 23) and 2 (June 30) presented the lowest percentages of disease severity. Additionally, it was observed that the oat grain yield decreases severely in the presence of stem rust and without being controlled with any fungicide.
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