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Employment of varietal mixtures to reduce the incidence of diseases on grain legumes

AutorVillegas-Fernández, Ángel M. ; Moral Moral, Juan ; Rubiales, Diego
Fecha de publicación2016
CitaciónSecond International Legume Society Conference (2016)
ResumenThe employment of resistant varieties is one of the best options to control diseases in legumes, both in ecological and economical terms. Nevertheless, one of the problems associated to this practice is the appearance of pathogen strains that are able to overcome the plant resistance. This calls for an efficient and wise management of resistance genes in which diversification is always key. We have focused on the use of varietal mixtures to reduce the impact of diseases in two important legume crops: pea and faba bean. Two field experiments were carried out for each crop, the assessed diseases being powdery mildew in pea and rust in faba bean. In both cases, a resistant monogenic variety was mixed with a susceptible one. Five treatments were tested, corresponding to growing proportions of the resistant variety: 0%, 25%, 50%, 75% and 100% (rows of the resistant variety were alternated with varying numbers of rows of the susceptible one depending on the desired proportion). Disease severity was recorded on the susceptible variety in each trial. Results in both experiments show a significant negative correlation between disease severity on the susceptible variety and the proportion of the resistant one. Severity reduction is important when the resistant variety is grown every other row (50% proportion), reaching highest levels with 75% proportion. The dilution effect of inoculum due to the distance between susceptible plants is probably behind these results.
DescripciónTrabajo presentado en el Second International Legume Society Conference "Legumes for a sustainable world" (ILS2), celebrado en Tróia (Portugal) del 11 al 14 de octubre de 2016.
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