Briem, Felix

Eben, Astrid

Hecht, Andrea

Hemer, Sebastian

Herzog, Katja

Vogt, Heidrun

English

JKI Open Journal Systems (Julius Kühn-Institut)

 9th Young Scientists Meeting, Quedlinburg, Germany, November 09-11, 2016 Hemer et al. Variety-depending susceptibility of cherries to Drosophila suzukii according to fruit firm-ness and other ripening parameters Sebastian Hemer1,2, Felix Briem2, Andrea Hecht3, Katja Herzog3, Astrid Eben2, Heidrun Vogt21 Georg-August-Universität Göttingen, Department of Crop Sciences, Plant Pathology and Crop Protec-tion Division, Göttingen 2 Julius Kühn-Institut, Institute for Plant Protection in Fruit Crops and Viticulture, Dossenheim 3 Julius Kühn-Institut, Institute for Grapevine Breeding, Siebeldingen Email of corresponding author: sebastian.hemer@stud.uni-goettingen.de The invasive pest species Spotted Wing Drosophila (SWD), Drosophila suzukii, was first recorded in Germany in 2011. D. suzukii is an extremely polyphagouspest and can reproduce on a large num-ber of cultivated and wild fruits. Withtheir serrated ovipositor females layeggs in undamaged ripening and ripefruits. During larval development in-fested fruits collapse rapidly and be-come unmarketable. D. suzukii cancause tremendous economic crop losses,especially in cherries and soft berries.Characteristics of the fruit, especially fruit firmness and skin parameters, can influence oviposition behaviour. Hence, cherry varieties were analysed during the ripening phase: Firstly, with a tex-ture measuring apparatus which indi-cates the force and energy needed to puncture the cherry skin; secondly by measuring the impedance, i.e. the resis-tance of the skin, in different positions (top, side and bottom) and thirdly, skin thickness (wax layer and subjacent cell layers) will be determined by micros-copy. These data were correlated with the natural infestation level in the field. In addition, oviposition tests were car-ried out in the laboratory with cherries from the corresponding sampling dates. For this study, the sweet cherry varieties ‘Hedelfinger’ and ‘Regina’ and the sour cherry variety ‘Schattenmorelle’ were chosen. During the ripening process samples were taken from the field at different ripening stages determined by the colour of the fruits. Texture analysis shows a decline of penetration force and energy during the ripening process. The same tendency can be observed for the impedance. However, variations were noted de-pending on the tested positions. The quantitative determination of the cherry skin thickness is in process and statistical analyses have not been finalized, yet.  First results show that the skin charac-teristics and the firmness of different cherry varieties have an effect on the oviposition preference of D. suzukii. With decrease of fruit firmness and skin resistance connected with the ripening process, oviposition increases. These findings should be confirmed with a larger selection of cherry varieties over several growing seasons. This study pro-vides initial indication for the possibility of managing D. suzukii in cherries by developing new cherry varieties with more resistant fruit skin. 12 Berichte aus dem Julius Kühn-Institut 186

Variety-depending susceptibility of cherries to Drosophila suzukii according to fruit firmness and other ripening parameters

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Variety-depending susceptibility of cherries to Drosophila suzukii according to fruit firmness and other ripening parameters

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