Control of Rhynchosporium secalis using host genetic and morphology heterogeneity
2004
Newton, A.C. | Guy, D.C. | Swanston, J.S. | Thomas, W.T.B. (Scottish Crop Research Inst. Invergowrie, Dundee DD2 5DA, Scotland (United Kingdom))
Substantial reductions in Rhynchosporium secalis infection were achieved in winter barley cultivar mixtures. Disease reduction was proportional to the number of components in the mixture. Yield increases were also proportional to mixture complexity whether disease was present or not, indicating improved resource exploitation. The mixture efficacy can be attributed not only to the classical explanations of genetic interaction, dilution of susceptible plants, barrier of resistant plants and induced resistance, but also to the interaction of canopy architecture with splash dispersal of the pathogen. Preliminary data indicates that maximum heterogeneity in plant habit gives greatest disease reduction
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