Awater, Sarah Dorothea

Christ, Stefan Alexander

Herz, Annette

English

JKI Open Journal Systems (Julius Kühn-Institut)

Nachwuchswissenschaftlerforum / Young Scientists Meeting 2013 Christ et al.     Native parasitoids and their potential for natural control of the invasive fruit pest  Drosophila suzukii (Diptera: Drosophilidae)   Stefan Alexander Christ1,2, Sarah Dorothea Awater1,3 and Annette Herz1 1Julius Kühn-Institut, Federal Research Centre for Cultivated Plants, Darmstadt 2Technical University Darmstadt, Plant Membrane Biophysics, Institute of Botany 3Georg-August-University Göttingen Email of corresponding author: stefan_a_christ@freenet.de  The spotted wing drosophila, Drosophi-la suzukii (Matsumura), is a vinegar fly that is closely related to D. melano-gaster and has expanded its distribu-tion from Asia to America and recently to Europe. It has been reported in most of the Mediterranean countries in Eu-rope and is rapidly spreading towards north and east. In 2012, D. suzukii has been identified in southwestern parts of Germany. This species infests commercial small and stone fruits as opposed to most species of drosophilids that only infest overripe, fallen or rotting fruits. Female D. suzukii possess a distinctive serrated ovipositor that allows them to lay eggs successfully into healthy and ripening fruits. After ovipositition, the larval stages causes a high risk to divers mar-ketable crops, especially soft or thin-skinned fruits which are collapsing through larval feeding. We will give a short overview of the actual situation and our monitoring programme of D. suzukii in the Rhein-Main-Area. Within the project it turned out that traps with a vinegar-water-mixture as bait at a ratio of 2:3 has been shown a highly efficient quantity of trapped drosophilids. We started the monitoring in April 2013 to investigate the species composition of the different Drosophilidae throughout the year. In order to found a laboratory rearing for parasitoid-experiments we disposed mush traps that enable oviposition through drosophilids. In cooperation with the Hessian Plant Protection Ser-vice we started also a small monitoring project of infested fruits by D. suzukii at a commercial fruit farm nearby Darm-stadt.  First results reveal that there are strong distinctions in the species composition of different native Drosophilidae-communities between rural and urban areas. We also found differences for surrounding trap location conditions, especially those between wood and cropland. Our data confirmed former studies which found that adult animals were not trapped before July. Hence, we presume that the new invasive fruit pest D. suzukii could occupy any eco-logical niche and build stable popula-tions.  Furthermore, we trapped native parasi-toids with Drosophila-larvae from our laboratory rearing as bait. In further laboratory experiments we hope to estimate the potential of biological con-trol of D. suzukii through parasitic wesp-species. This could raise the hope for a prospective natural control strat-egy against the invasive fruit pest D. suzukii. Berichte aus dem Julius Kühn-Institut 171 17

Native parasitoids and their potential for natural control of the invasive fruit pest Drosophila suzukii (Diptera: Drosophilidae)

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Native parasitoids and their potential for natural control of the invasive fruit pest Drosophila suzukii (Diptera: Drosophilidae)

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