Boeninger, Clara

Eben, Astrid

Herz, Annette

Katz, Peter

Martin, Jakob

Rademacher, Jörg

Reineke, Annette

English

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45DGaaE-Nachrichten 37(1), 2023control agents into a new environment, it is important to consider the potential for unintended	non-target	effects	such	as	host-range	expansion	to	native	or	beneficial	species.	Accordingly,	host	specificity	testing	of	T. japonicus has been carried out under containment conditions in Europe. Developmental suitability of non-target host species for T. japonicus was demonstrated in no-choice tests by successful offspring	emergence	from	11	of	13	non-target	species	tested.	Whereas	most	non-target species were less accepted than H. halys, four native species, Palomena prasina (L.), Rhaphigaster nebulosa (Poda), Pentatoma rufipes (L.), and Arma custos (F.), were accepted at numbers comparable to the target host. As laboratory risk assessment studies for T. japonicus in Europe were underway, adventive populations of T. japonicus were discovered in Switzerland, Italy and Germany. Following the unintentional introduction, the ecological host range of T. japonicus in the invaded regions in Switzerland was investigated by exposing sentinel egg masses of H. halys and native non-target species. Egg masses of P. prasina and P. rufipes exposed on trees were regularly parasitized by T. japonicus, whereas species feeding on weeds were not attacked at all. Since P. rufipes starts laying eggs in late August when T. japonicus populations are highest, it was the most frequently	parasitized	non-target	species.	Ongoing	life	table	studies	in	Europe	may	help to understand if the arrival of T. japonicus has any negative consequences for P. rufipes populations.Application of pupal parasitoids for the biological control of Drosophila suzukii (Diptera: Drosophilidae) in berry fruit production – ParaDrosuClara	Boeninger 1,	Annette	Reineke 1,	Jakob	Martin 2,	Astrid	Eben 3,	Peter	Katz 4,	Jörg	Rademacher 4 & Annette	Herz 21 Hochschule Geisenheim University, Department of Crop Protection, Von-Lade-Straße 1, 65366 Geisenheim, Germany2 Julius Kühn Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Biological Control, Schwabenheimer Straße 101, 69221 Dossenheim, Germany3 Julius Kühn Institute (JKI), Federal Research Centre for Cultivated Plants, Institute for Plant Protection in Fruit Crops and Viticulture, Schwabenheimer Straße 101, 69221 Dossenheim, Germany4 Katz Biotech AG, An der Birkenpfuhlheide 10, 15837 Baruth/Mark, GermanyThe invasive spotted wing drosophila (Drosophila suzukii) has become a major pest in protected berry fruit production in Europe. This is due to the development of several generations per year and the capability of females to infest undamaged soft-skinned fruits of various wild and cultivated host plants. Insecticides are often inefficient	and	can	leave	residues	due	to	the	infestation	of	ripening	or	ripe	fruit,	why applications are close to harvest. Exclusion netting works well but is cost intensive	and	sometimes	not	sufficient	to	control	emerging	populations.	Luckily,	the native pupal parasitoids Trichopria drosophilae (Hymenoptera: Diapriidae) and Pachycrepoideus vindemiae (Hymenoptera: Pteromalidae) have been found to successfully parasitize D. suzukii and thus have a great potential as biological 46 DGaaE-Nachrichten 37 (1), 2023control agents that may supplement current control measures. The research project “ParaDrosu”	(2021-2024)	aims	at	developing	an	innovative	biological	management	strategy based on the release of these pupal parasitoids. Aspects investigated include successful mass rearing of parasitoids, which requires suitable hosts, the right climatic conditions and diets for the adults. Moreover, the rearing system must	be	efficient	as	well	as	economically	viable.	Within	the	project,	parasitoid	populations	from	different	areas	in	Germany	will	be	collected	and	tested	for	their	performance with the aim to introduce these populations into the existing rearing stock	to	maintain	parasitoid	quality.	Performance	under	different	climatic	conditions	was	tested	and	optimal	storage	conditions	were	defined.	An	appropriate	parasitoid	application technique ensuring both, optimal protection during transport and release	and	sufficient	dispersal	in	the	crop	will	be	developed.	Furthermore,	the	best release times, intervals and parasitoid numbers will be determined. Relevant plant	protection	products	are	tested	for	negative	side	effects	on	the	parasitoids	to	define	possible	incompatibilities	as	well	as	suitable	timing	for	integrated	pest	management	strategies.	Semi-field	and	field	trials	are	conducted	in	Southern	Germany	to	examine	the	parasitoids’	efficiency	in	controlling	D. suzukii in berry fruit	cultivation.	Results	from	the	described	research	project	should	lead	to	defining	mass production technology as well as develop detailed instructions for successful use to control D. suzukii in protected berry fruit cultivation under Middle European climatic conditions.The project “ParaDrosu” – Biological Control of Drosophila suzukii by application of native pupal parasitoids – a closer look Jakob	Martin1, *,	Clara	Boeninger2,	Heidrun	Vogt3,	Astrid	Eben3,	Annette	Reineke2,	Jörg	Rademacher4,	Peter	Katz4 &	Annette	Herz11 Julius Kühn Institute (JKI), Federal Research Institute for Cultivated Plants, Institute for Biological Control, Schwabenheimer Straße 101, 69221 Dossenheim2 Hochschule Geisenheim University, Department of Crop Protection, Von-Lade-Straße 1, 65366 Geisenheim3 Julius Kühn Institute (JKI), Federal Research Institute for Cultivated Plants, Institute for Plant Protection in Fruit Crops and Viticulture, Schwabenheimer Straße 101, 69221 Dossenheim4 Katz Biotech AG, An der Birkenpfuhlheide 10, 15837 Baruth * E-Mail: jakob.martin@julius-kuehn.deDrosophila suzukii Matsumura (Diptera: Drosophilidae) is an invasive pest of fruit and berries. The attack of undamaged ripening fruit is a major challenge for pest	control	and	effective	means	of	biological	control	to	manage	D. suzukii in Germany do not exist yet. In its native range, D. suzukii	is	attacked	by	different	Hymenoptera, such as the cosmopolitan pupal parasitoids Trichopria drosophilae Perkins (Diapriidae) and Pachycrepoideus vindemmiae Rondani (Pteromalidae). European populations of both species can successfully parasitize D. suzukii. Prior to application of parasitoids on a commercial scale, a suitable application density 

Application of pupal parasitoids for the biological control of Drosophila suzukii (Diptera: Drosophilidae) in berry fruit production – ParaDrosu

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Application of pupal parasitoids for the biological control of Drosophila suzukii (Diptera: Drosophilidae) in berry fruit production – ParaDrosu

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