Abstract
Disease progress of black rot in cabbage crop was studied over three years in field plots to compare the effects of uni-focal and multi-focal inoculum applied in equal amounts per plot. Disease progress (plant incidence and leaf incidence) was plotted over time, three dimensional maps were made, and disease aggregation was studied by means of geostatistics, black-black counts and Moran's I statistic. Black rot progress was primarily due to focus expansion. Secondary foci may appear at short distances from the initial focus but they usually merge with the expanding initial focus. Anisotropy occurred occasionally but was of minor importance. Disease proceeds faster in plots with multi-focal inoculation than in those with uni-focal inoculation. Probably, serious epidemics in Dutch cabbage fields originate from large numbers of foci.
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Kocks, C.G., Zadoks, JC. & Ruissen, T.A. Response of black rot in cabbage to spatial distribution of inoculum. European Journal of Plant Pathology 104, 713–723 (1998). https://doi.org/10.1023/A:1008665511022
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DOI: https://doi.org/10.1023/A:1008665511022