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Rhynchosporium leaf scald disease incidence: seed source and spatial pattern |
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| Authors: | C F E Topp G Hughes I M Nevison A Butler S J P Oxley N D Havis |
| Institution: | 1. Crop & Soil Systems, SRUC, West Mains Road, Edinburgh, EH9 3JG UK;2. Biomathematics and Statistics Scotland, James Clerk Maxwell Building, Peter Guthrie Tait Road, The King's Buildings, Edinburgh, EH9 3FD UK;3. Crop & Soil Systems, SRUC, West Mains Road, Edinburgh, EH9 3JG UK
Agriculture and Horticulture Development Board, Stoneleigh Park, Warwickshire, CV8 2TL UK |
| Abstract: | A programme of field trials for the study of the winter barley–Rhynchosporium commune pathosystem is reported. The associated seedborne disease rhynchosporium leaf scald is regarded as having an important impact on barley yields. The analysis in this study relates to the impact of the seed source (commercial or farm-saved seed) on disease incidence and to the spatial pattern of rhynchosporium leaf scald disease incidence. Disease incidence data were calculated from field data recorded as disease severity. Mean disease incidence was higher in the crops grown from farm-saved seed than in those grown from commercial seed, although great agronomic significance cannot be attached to this result. The spatial pattern of rhynchosporium leaf scald disease incidence was characterized in terms of the binary power law (BPL) and was indicative of an aggregated pattern. Programme-wide BPL results were described using a novel phytopathological application of a random coefficients model. These results have application in field sampling for rhynchosporium leaf scald disease. |
| Keywords: | binary power law disease incidence random coefficients model Rhynchosporium commune rhynchosporium leaf scald winter barley |