Summary
Preliminary field trials indicated that the yields of mixtures of barley cultivars partially resistant to mildew (Erysiphe graminis f. sp. hordei) were greater than those expected from the mean of their components. Subsequent trials in 1988, 1989 and 1990 demonstrated that such mixtures gave enhanced yield. However, fungicide treatment of mixtures gave significant positive and negative effects on yield. In mixtures with cultivars containing partial resistance there was evidence of a positive relationship between high yield loss due to mildew (low disease tolerance) in cultivars grown in monoculture and their yield advantage in mixtures. The converse resulted in yield disadvantage.
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Newton, A.C., Thomas, W.T.B. The effect of specific and non-specific resistance in mixtures of barley or genotypes on infection by mildew (Erysiphe graminis f. sp. hordei) and on yield. Euphytica 59, 73–81 (1991). https://doi.org/10.1007/BF00025363
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DOI: https://doi.org/10.1007/BF00025363