Shade effects on coffee rust (Hemileia vastatrix)

Avelino Jacques, Badaroux Julia, Boudrot Audrey, Brenes Loaiza Marvin Alejandro, Granados Eduardo, Henrion Maxime, Lopez Donal, Merle Isabelle, Pico Rosado Jimmy Trinidad, Segura Beatriz, Vilchez Mendoza Sergio José, Smith Mark, De Melo Elias. 2019. Shade effects on coffee rust (Hemileia vastatrix). 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. 789. World Congress on Agroforestry. 4, Montpellier, France, 20 Mai 2019/22 Mai 2019.

Résumé : To better understand shade effects on coffee rust (Hemileiavastatrix), we studied pathogen dispersal, deposition, germination, penetration, colonization and sporulation under shade and full sun conditions (Figure). Studies were conducted from 2008 in the CATIE agroforestry system long term trial, at Turrialba, Costa Rica, at 600 m of altitude. Shade had a preponderant and unwished effect on spore conservation during rains. At full sun, spores were washed from the leaves to the ground more easily. An average loss of 69 spores cm-2 of ground, at full sun, was estimated after a rainy day, under coffee trees, while under shade, only 52 spores cm-2 were lost, despite inoculum stock being on average about 25 638 spores per coffee tree branch at full sun and 63 579 spores under shade. The reduc-tion of the inoculum stock by rains was therefore 3.3 times higher at full sun as compared to shade. This can be explained by the interception of rainwater by shade trees. As lost spores cannot contribute to the growth of the epidemic, this effect seems to be one of the most relevant effects favoring rust under shade.Shade is necessary to cope with climate change in coffee systems. Many of the negative effects of shade have to do with the interception of rainwater (reduced throughfall water and also higher raindrop kinetic energy). Shade tree functional traits or management systems that allow to increase throughfall water in coffee plots would be of great interest to manage rust.

Mots-clés Agrovoc : Coffea, agroforesterie, arbre d'ombrage, absorption d'eau, adaptation aux changements climatiques, maladie des plantes

Classification Agris : H20 - Maladies des plantes
F08 - Systèmes et modes de culture
K10 - Production forestière
F60 - Physiologie et biochimie végétale
P40 - Météorologie et climatologie

Auteurs et affiliations

• Avelino Jacques, CIRAD-BIOS-UPR Bioagresseurs (CRI) ORCID: 0000-0003-1983-9431 - auteur correspondant
• Badaroux Julia, CATIE (CRI)
• Boudrot Audrey, INIAP (ECU)
• Brenes Loaiza Marvin Alejandro, CATIE (CRI)
• Granados Eduardo, UCR (CRI)
• Henrion Maxime, CATIE (CRI)
• Lopez Donal, CATIE (CRI)
• Merle Isabelle, CIRAD-BIOS-UPR Bioagresseurs (CRI)
• Pico Rosado Jimmy Trinidad, CATIE (CRI)
• Segura Beatriz, CATIE (CRI)
• Vilchez Mendoza Sergio José, CATIE (CRI)
• Smith Mark, WCR (USA)
• De Melo Elias, CATIE (CRI)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/592568/)

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