Analysis of Spatial Patterns in Sorghum Downy Mildew with Morisita's Index of Dispersion

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Abstract
The distribution and spatial pattern of sorghum [Sorghum bicolor] plants systemically infected with Peronosclerospora sorghi were determined by using Morisita''s index of dispersion. A contiguous area of 1,300 m2 was assessed for disease incidence twice during the growing season at two locations. Each assessment was done by using eight quadrat sizes (binary series from 1 m2 to 128 m2). The spatial pattern of diseased plants was clumped at each date and location as determined by the use of Morisita''s index. Several clump sizes, which were in a hierarchical order, were detected at each location. Comparison of clump sizes between assessment dates showed a reduction in average clump size which was attributed to premature plant death. The distribution of the data could not be fitted to known probability distributions with statistical significance.

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