Potato late blight, caused by Phytophthora infestans, is one of the main diseases in potato production, causing major losses in yield. Potato late blight is presently controlled by toxic fungicides. There is therefore a need for safer strategies. Agronomists Pacilly et al. used fuzzy cognitive mapping, a modeling technique, to understand the biological, physical and social factors influencing late blight development, and, in turn, to propose the best management scenario.