Powdery Mildew of Sugar Beet: Disease and Crop Loss Assessment

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Abstract
Various disease [Erysiphe betae, E. polygoni] control treatments were used to produce 5 sequences of disease development in each of 3 sugar beet field trials. Disease appraisal was accomplished biweekly by evaluating 25 mature leaves per plot as to the extent of leaf area diseased on a scale of 0-5 corresponding to 0, 10, 35, 65, 90 and 100% of the leaf area diseased. A season-long disease index was calculated for each disease control treatment as a weighted average of biweekly appraisals from disease onset to Oct 1. The weighing factor was the number of weeks from evaluation date to Oct 1. Season-long indexes correlated well with crop loss. The estimation of crop loss was improved by combining data over all years and including the yield of healthy plants in addition to the season-long disease index.

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