| Abstract: | The results of 21 winter wheat and 32 spring barley trials done in the United Kingdom showed that cultivars differed significantly in their yield response to a standard fungicide treatment. Regression analyses showed that yield responses were significantly related to disease reduction, particularly that of mildew, although the proportion of variance accounted for was small. Measurements made on seven winter wheat trials indicated that the percentage of leaf area remaining green after anthesis was increased by the fungicide treatment to a greater extent than could be attributed to disease reduction alone. In some of these trials, yield responses were more closely correlated with the increase in leaf area remaining green than with disease reduction. |
