How do hedgerow characteristics alter the dispersal of Pseudocercospora fijiensis propagules?

Delatouche Lucile, Tixier Philippe, Sainte-Rose Jérome Laurent, Daribo Marie Odette, De Lapeyre de Bellaire Luc. 2024. How do hedgerow characteristics alter the dispersal of Pseudocercospora fijiensis propagules?. Pest Management Science, 80 (3) : 1454-1464.

Résumé : BACKGROUND: Hedgerows represent an agroecological lever for pest management. To date, few studies have shown that they can be used as a lever for the control of aerial fungal diseases, especially as a barrier to dispersal. On banana production, the main disease is black leaf streak disease (BLSD), which is a fungal disease caused by Pseudocercospora fijiensis. This pathogen disperses through two types of spores: ascospore and conidia. The aim of this study was to observe and to quantify the effect of hedgerows on BLSD dispersal. Trap plants were placed at the same distance to an artificial source of inoculum with a hedgerow on one side. Lesions were counted to establish the daily lesion density of each trap plant. The combination of hedgerow characteristics such as height, width, and optical porosity were used to evaluate its potential capacity to intercept spores. RESULTS: When ascospores were used as a source of inoculum, the lesion density on traps plant decreased up to 50% between the hedgerow with the lowest interception capacities and the one with the highest interception capacities. For conidia, hedgerow height and side of the trap plants (with or without hedgerow between them and the source) were not significant, but low porosity of the hedgerow reduced the lesion density. On the contrary, for ascospore, the hedgerow effect was anisotropic; the trap plants on hedgerow side had less lesions. CONCLUSION: Our study is the first experimental proof of the effect of hedgerows on P. fijiensis dispersion, both on conidia and ascospore. We showed that hedgerow characteristics impact the capacity of interception of the hedgerow.

Mots-clés Agrovoc : Musa, Pseudocercospora, maladie des raies noires, maladie fongique, anatomie végétale, agroécologie

Mots-clés géographiques Agrovoc : France, Martinique

Agences de financement européennes : European Commission

Agences de financement hors UE : Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Projets sur financement : (FRA) Projet de gestion territoriale collective des bioagresseurs des bananiers en Martinique, (FRA) Leviers territoriaux

Auteurs et affiliations

• Delatouche Lucile, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0002-1309-7986 - auteur correspondant
• Tixier Philippe, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0001-5147-9777
• Sainte-Rose Jérome Laurent, CIRAD-PERSYST-UPR GECO (MTQ)
• Daribo Marie Odette, CIRAD-PERSYST-UPR GECO (MTQ)
• De Lapeyre de Bellaire Luc, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0003-1243-0887

Source : Cirad-Agritrop (https://agritrop.cirad.fr/608245/)

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