Management of small mangoes at the time of early fruit drop, as a fruit fly (Diptera: Tephritidae) control lever

Ratnadass Alain, Grechi Isabelle. 2023. Management of small mangoes at the time of early fruit drop, as a fruit fly (Diptera: Tephritidae) control lever. . ESA. s.l. : ESA, 1 p. Annual ESA International Branch Virtual Symposium. 5, s.l., États-Unis, 24 Avril 2023/26 Avril 2023.

Note générale : Le congrès s'est tenu en ligne

Résumé : In Réunion, the Oriental Fruit Fly (OFF) Bactrocera dorsalis has recently become the major pest of mango. Earlier studies conducted in West Africa have shown that small mango fruits fallen to the ground during early fruit drop, could serve as sources of OFF outbreaks in orchards. We therefore conducted in 2019 and 2020, in orchards at Saint-Paul (West) and Saint-Pierre (South), studies to evaluate the potential of prophylactic elimination of fallen small mango fruits as a lever for OFF control. Small green growing mango fruits on the tree were barely infested (0% at Saint-Pierre, 5.6% at Saint-Paul), whereas those close to abscission sustained heavier infestation rates (resp. 9.6% and 22.2%), suggesting that it is abscission that makes small fruits attractive/susceptible to OFF punctures, and not prior punctures by OFF on green fruits that trigger abscission. In 2019, infestation of fallen fruits, ranged from 12% at Saint- Pierre and 2% at Saint-Paul (both on woven plastic soil cover), to respectively 75% (on bare soil) and 46% (on resident vegetation-covered soil). At Saint-Pierre in 2020, it ranged from 3% on resident vegetation to 13% on woven plastic. Both years at both sites, infestation was only due to OFF, and OFF parasitism by the micro-wasp Fopius arisanus was anecdotal. Results are discussed, in the light of varying OFF pressure and ground surface temperatures, particularly the compatibility of weekly removal of small (>30g though) fallen fruits, with other control levers earlier identified for OFF and pests of mango inflorescences.

Mots-clés libres : Bactrocera dorsalis, Reunion Island, Fruit abscission, Ground cover, Rolling nut harvester

Agences de financement européennes : European Regional Development Fund, European Agricultural Fund for Rural Development

Agences de financement hors UE : Région Réunion, Office de développement de l'économie agricole des départements d'Outre-Mer, Conseil Général de La Réunion, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Projets sur financement : (FRA) Co-conception de systèmes agro-alimentaires de qualité, (REU) Evaluation de la faisabilité d'une GEstion Multi-échelles du ravageur invasif Bactrocera DOrsalis sur manguier à La Réunion, incluant la Technique de l’Insecte Stérile

Auteurs et affiliations

• Ratnadass Alain, CIRAD-PERSYST-UPR AIDA (REU) ORCID: 0000-0002-8873-5671
• Grechi Isabelle, CIRAD-PERSYST-UPR HortSys (FRA) ORCID: 0000-0002-3399-6102

Source : Cirad-Agritrop (https://agritrop.cirad.fr/604564/)

Métriques

[ Page générée et mise en cache le 2023-07-04 ]