2016/01/01 by Claude Pope de Vallavieille, Sébastien Saint‐Jean, Pope De Vallavieille, Claude +15
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #0 #Blé #Epidemic modelling Introduction #Gestion des variétés résistantes #Management of resistant cultivars #Modèle épidémique #Plant Disease Resistance and Genetics #Plant Pathogens and Fungal Diseases #Plant Pathogens and Resistance #Wheat #Zymoseptoria tritici
paper · doi:10.15454/1.4721162285051362e12
openalex publication_date 2016/01/01 · openalex created_date 2018/02/23 · openalex updated_date 2026/07/26
The potential of wheat cultivar mixtures for reducing the spread of diseases by long-distance winddispersal is well documented, but the references are very limited for diseases spread by short-distance splash dispersal. Field epidemiological experimentations carried out over a 5-year period showed that a combination of a susceptible and a partially resistant wheat cultivar can reduce up to 40% the severity of septoria leaf blotch, which however depended on each year’s disease pressure. Extension services showed that the yield of mixtures of four wheat cultivars tested between 2010 and 2012 under different disease pressures had a 5% reduction of fungicide applications on average with the mean yield of the pure stands. In field trials without fungicide application over the 3-year period at two locations, the benefit of 4-cultivar mixtures compared to the mean of the pure stands was assessed to be 0.23 t/ha. A simulation model based on spore splash dispersal by raindrops in a heterogeneous canopy determined the optimal proportions of varieties in a two-way mixture as a function of the partial resistance level of the two varieties. This cropping system provided an advantage when foliar diseases were present and was not disadvantageous when diseases were not present.