Many pests and diseases have two or more dispersal mechanisms, differing in dispersal parameters and relative frequencies. However, published studies all refer to models with a single dispersal mechanism. A new numerical method, based on diffusion theory, allowed simultaneous determination of two dispersal mechanisms. The model was parametrized with data from focus-forming Uredinales and Peronosporales. A form of sensitivity analysis allowed us to study not only the effects of input parameters on output parameters but also the effects of their interactions. These output parameters are the total number of lesions in a finite field and the velocity of focus expansion (...)
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M. W. Zawolek (1992) studied this question.