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Simulation of Potato Late Blight in the Andes. I: Modification and Parameterization of the LATEBLIGHT Model

First author: International Potato Center (CIP), P.O. Box 17 21 1977, Quito, Ecuador; second, third, and fifth authors: International Potato Center (CIP), P.O. Box 1558, Lima 12, Peru; and fourth author: Department of Plant Pathology, 334 Plant Sciences Building, Cornell University, Ithaca, NY 14853

LATEBLIGHT, a mathematical model that simulates the effects of weather, host growth and resistance, and fungicide use on asexual development and growth of Phytophthora infestans on potato foliage, was modified so that it can be used in the Andes and, eventually, worldwide. The modifications included (i) the incorporation of improved equations for the effect of temperature on lesion growth rate (LGR) and sporulation rate (SR); (ii) the incorporation of temperature-dependent latent period (LP); and (iii) the use of experimentally measured parameters of LGR, SR, and LP for specific potato cultivars and pathogen lineages. The model was parameterized for three Peruvian potato cultivars (Tomasa, Yungay, and Amarilis) infected with isolates of a new clonal lineage of P. infestans that is currently predominant in Ecuador and Peru (EC-1).

Additional keywords: fitness components , tropical highlands .