Can the banana weevil Cosmopolites sordidus be a vector of Fusarium oxysporum f.sp. cubense race 1? Unravelling the internal and external acquisition of effective inoculum

Guillen Sanchez Cesar, Tixier Philippe, Tapia Fernandez Ana Cecilia, Conejo Barboza Ana Maria, Sandoval Fernández Jorge Arturo, De Lapeyre de Bellaire Luc. 2021. Can the banana weevil Cosmopolites sordidus be a vector of Fusarium oxysporum f.sp. cubense race 1? Unravelling the internal and external acquisition of effective inoculum. Pest Management Science, 77 (6) : 3002-3012.

Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : ENTOMOLOGY

Résumé : BACKGROUND: With the undergoing world outbreak of Fusarium wilt of bananas, it is essential to unravel all the possible process of dissemination of this disease. The host‐pest interactions of the banana weevil with banana plants make this insect an important potential vector. This study, carried out in controlled conditions, explores the interaction between the banana weevil and Fusarium oxysporum f.sp. cubense race 1 (Foc), with a focus on the external and internal transport of viable fungal propagules. RESULTS: Viable inoculum of Foc was detected very rapidly on external teguments and in the digestive tract of the insect, i.e. at the lowest time studied of 5 min after contact with infected pseudostems. Maximal inoculum acquisition occurred after 1 h contact with an inoculum source. External inoculum was higher than the inoculum present in the digestive tract, but external and internal inoculum had the same dynamics. After a contact of an infected source, external and internal inoculum decreased exponentially within 50 h, but weevils remained infested for a long time, as long as 2 or 3 days that would be enough for inoculum dispersal. Viable inoculum was also detected in feces. Foc strains isolated were pathogenic when inoculated to banana plants of the Gros Michel variety but did not provoke any symptom on Cavendish banana plants. CONCLUSION: These results demonstrate that the infective structures of Foc remain externally viable in the digestive system and the excreta of the banana weevil. Such excreta are capable of making healthy banana plants of the Gros Michel variety.

Mots-clés Agrovoc : maladie des plantes, ravageur des plantes, vecteur de maladie, transmission des maladies, relation hôte pathogène, pathogénèse, pathologie végétale, Cosmopolites sordidus, Fusarium oxysporum

Mots-clés complémentaires : Fusarium oxysporum f. sp. cubense, Inoculum, banane Gros Michel

Mots-clés libres : Insect mediated dispersion, Acquisition dynamics, Foc, Gros Michel cultivar, Pathogenicity

Classification Agris : H20 - Maladies des plantes
H10 - Ravageurs des plantes
H50 - Troubles divers des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Guillen Sanchez Cesar, CIRAD-PERSYST-UPR GECO (FRA)
• Tixier Philippe, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0001-5147-9777
• Tapia Fernandez Ana Cecilia, UCR (CRI)
• Conejo Barboza Ana Maria, Dirección de Investigaciones (CRI)
• Sandoval Fernández Jorge Arturo, Dirección de Investigaciones (CRI)
• De Lapeyre de Bellaire Luc, CIRAD-PERSYST-UPR GECO (FRA) ORCID: 0000-0003-1243-0887 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/598295/)

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