Abstract
SUMMARYIn a series of experiments excised leaves from take‐all infected wheat plants and from control plants were inoculated with Septoria nodorum. Larger lesions, more lesions/leaf and more pycnidia/unit area of lesion were produced from take‐all plants. Significant effects of predisposition were demonstrated when only 3% of the area of the total root system was infected by take‐all.Microscopical investigations revealed that germ‐tubes of S. nodorum grew more rapidly on leaves from take‐all plants, but the time of penetration was not affected. It is proposed that the observed effects of predisposition arose because more germ‐tubes produced successful infections and host tissue was more rapidly colonised.The importance of these results for the epidemiology of glume blotch is discussed.
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