Estimating microclimate in agroforestry systems based on nearby full sun measures to forecast coffee rust development

Merle Isabelle, Villarreyna Acuna Rogelio Antonio, Tixier Philippe, Ribeyre Fabienne, Cilas Christian, Avelino Jacques. 2019. Estimating microclimate in agroforestry systems based on nearby full sun measures to forecast coffee rust development. In : 4th World Congress on Agroforestry. Book of abstracts. Dupraz Christian (ed.), Gosme Marie (ed.), Lawson Gerry (ed.). CIRAD, INRA, World Agroforestry, Agropolis International, MUSE. Montpellier : CIRAD-INRA, Résumé, p. 787. World Congress on Agroforestry. 4, Montpellier, France, 20 Mai 2019/22 Mai 2019.

https://agroforestry2019.cirad.fr/news-press

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Résumé : In Central America, coffee is grown in agroforestry systems. Since 2012, coffee leaf rust, caused by the fungus Hemileia vastatrix, has produced major epidemics in this region. To prevent future epidemics, the European Union through its PROCAGICA program (Programa Centroamericano de Gestión Integral de la Roya del Café) promotes the creation of an early warning system based on weather monitoring.To build models to forecast the disease we must first identify which microclimatic variables are responsible for rust development and then be able to estimate these variables under different agroforestry systems as a function of the data provided by weather stations, established at full sun. From a trial set up in Costa Rica where disease and weather data were monitored, we deduced, without a priori [1], that the different disease development stages (see figure) were the result of complex combinations of microclimatic variables acting at diffe-rent periods (times and durations). Then, to estimate the effect of agroforestry systems on these microclimatic variables, a second trial was conducted in Costa Rica within an altitudinal gradient. In each site, meteorological stations were set up in a full sun reference plot and coffee plots with different shade trees. Using boosted regression tree method, we found that microclimate under shading depends mainly on full sun weather with nonlinear relationship, hour, shade tree species, orientation, canopy openness and plot slope in this order.

Mots-clés Agrovoc : Coffea, arbre d'ombrage, agroforesterie, résistance aux maladies, résistance aux facteurs nuisibles

Mots-clés géographiques Agrovoc : Costa Rica

Classification Agris : F08 - Systèmes et modes de culture
K10 - Production forestière
H20 - Maladies des plantes

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