Simple models to predict the incidence of premature ripening caused by Phoma macdonaldii as a function of sunflower crop management
Résumé
Premature ripening (PR) induced by Phoma macdonaldii Boerema is one of the most severe and widespread sunflower disease in France. PR could be responsible for the stagnation of seed yields around 2.5 t.ha-1 during the two last decades. As no resistant variety and no fungicide are available, cultural control remains the alternative method to limit yield losses. High N availability, high plant density and water stress after flowering significantly increase the occurrence of PR in sunflower (Seassau et al., 2010). In this paper, simple statistical models are suggested to represent PR incidence as a function of plant nitrogen status, plant population and water stress.
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