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A general model for gradient analysis


, : A general model for gradient analysis. Phytopathologische Zeitschrift 98(2): 150-154

The spore dispersal/infection gradient model a exp(-bxn) is introduced as a flexible equation which includes the previously used models a x-b, a exp(-bx) and a exp(-bx2) [where x is the distance from the inoculum source, a is proportional to the amount of disease or to the quantity of inoculum at the source, b is a coefficient for slope or gradient], as well as all intermediate curve shapes. Dispersal data for rice blast (Pyricularia oryzae) disease are analyzed, and a method for incorporating wind distortion by inclusion of a sine function is discussed.

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