Strategies for Controling Pests in Perennial Crops: Can Monitoring Replace Pesticides ?

Jean-Sauveur Ay, Olga Bernard and Estelle Gozlan ()
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Olga Bernard: UMR PSAE - Paris-Saclay Applied Economics - AgroParisTech - Université Paris-Saclay - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement
Estelle Gozlan: UMR PSAE - Paris-Saclay Applied Economics - AgroParisTech - Université Paris-Saclay - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement

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Abstract: Reducing the use of chemical pesticides is a key objective in many countries. Yet environmentally-friendly alternatives usually differ from pesticides in terms of both efficiency and cost, and their adoption by farmers may also depend on neighbouring farmers' strategies, as pests and diseases spread. Focusing on a vectorborne epidemic disease affecting perennial crops, we study the profit maximising strategies of two producers facing an epidemia in their respective plots. On the one hand, using pesticides stops the spatial spread of the disease, at a per-unit private cost, and external costs. On the other hand, monitoring their plots and removing the diseased plants also slows down contagion (depending on the level of prospection), but can never result in full eradication either, because of the disease latency period (asymptomatic plants remain contagious) and imperfect testing. Using a stylized 3-period framework, we investigate the conditions under which full monitoring can arise as a stationary equilibrium, and the implications for public regulation when both environmental externalities and aggregate profit enter the regulator's objective.

Date: 2023-08-29
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Published in XVII EAAE Congress - Agri-Food Systems in a changing world: connecting science and society, Aug 2023, Rennes, France

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