title: InvasiveDrosophila suzukiifacilitatesDrosophila melanogasterinfestation and sour rot outbreaks in the vineyards.
abstract: How do invasive pests affect interactions between members of pre-existing agrosystems? The invasive pestDrosophila suzukiiis suspected to be involved in the aetiology of sour rot, a grapevine disease that otherwise develops followingDrosophila melanogasterinfestation of wounded berries. We combined field observations with laboratory assays to disentangle the relative roles of bothDrosophilain disease development. We observed the emergence of numerousD. suzukii, but noD. melanogasterflies, from bunches that started showing mild sour rot symptoms days after field collection. However, bunches that already showed severe rot symptoms in the field mostly containedD. melanogaster. In the laboratory, oviposition byD. suzukiitriggered sour rot development. An independent assay showed the disease increased grape attractiveness to ovipositingD. melanogasterfemales. Our results suggest that in invaded vineyards,D. suzukiifacilitatesD. melanogasterinfestation and, consequently, favours sour rot outbreaks. Rather than competing with close species, the invader subsequently permits their reproduction in otherwise non-accessible resources and may cause more frequent, or more extensive, disease outbreaks.
authors.affiliation: INRA , F-34988 Montferrier-sur-Lez , France.
authors.forename: A
authors.identifier: 0000-0002-8994-351X
authors.initials: A
authors.lastname: Rombaut
authors.affiliation: INRA , F-34988 Montferrier-sur-Lez , France.
authors.forename: R
authors.initials: R
authors.lastname: Guilhot
authors.affiliation: INRA , F-34988 Montferrier-sur-Lez , France.
authors.forename: A
authors.initials: A
authors.lastname: Xuéreb
authors.affiliation: CIRAD, UMR CBGP , F-34988 Montferrier-sur-Lez , France.
authors.forename: L
authors.initials: L
authors.lastname: Benoit
authors.affiliation: CIRAD, UMR CBGP , F-34988 Montferrier-sur-Lez , France.
authors.forename: M P
authors.initials: MP
authors.lastname: Chapuis
authors.affiliation: Université de Lyon , Université Claude Bernard Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive, F-69100 Villeurbanne , France.
authors.forename: P
authors.initials: P
authors.lastname: Gibert
authors.affiliation: INRA , F-34988 Montferrier-sur-Lez , France.
authors.forename: S
authors.identifier: 0000-0003-3921-4578
authors.initials: S
authors.lastname: Fellous
keywords: Drosophila melanogaster; Drosophila suzukii; community ecology; sour rot