Article CC BY 4.0
refereed
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Virulence and pathogenicity of four Ditylenchus dipsaci populations on sugar beet

Affiliation
Bern University of Applied Sciences BFH, School of Agricultural, Forest and Food Sciences HAFL, Switzerland
Storelli, Alan;
GND
120454858
Affiliation
Julius Kühn-Institute (JKI), Institute of Plant Protection in Field Crops and Grassland, Germany
Kiewnick, Sebastian;
GND
135911168
Affiliation
Julius Kühn-Institute (JKI), Institute of Plant Protection in Field Crops and Grassland, Germany
Daub, Matthias;
Affiliation
Institute of Sugar Beet Research IfZ, Germany
Mahlein, Anne-Katrin;
Affiliation
KWS SAAT SE & Co. KGaA, Germany
Schumann, Mario;
Affiliation
KWS SAAT SE & Co. KGaA, Germany
Beyer, Werner;
Affiliation
Bern University of Applied Sciences BFH, School of Agricultural, Forest and Food Sciences HAFL, Switzerland
Keiser, Andreas

The stem nematode, Ditylenchus dipsaci, is a severe pest in European sugar beet production. In France, Germany, and Switzerland, D. dipsaci damage in sugar beet varies among specific geographic areas. In this study, the reproduction potential of four geographically distinct D. dipsaci populations was determined using sterile carrot disc cultures. In addition, virulence and pathogenicity were investigated in-vivo using sugar beet. No difference was found in the reproduction potential on carrot discs, as well as penetration rate in sugar beet seedlings. The reproduction rate in sugar beet tissue was significantly affected by the D. dipsaci population used. The population from Seeland (CH) showed the highest number of nematodes per plant at 60 dpi (21,071.8 ± 5340.0), compared to the three other populations contained 3588.6 ± 3858.3, 5136.9 ± 4950.8, and 3579.7 ± 5174.2, respectively. Furthermore, the reproduction rate of D. dipsaci was negatively correlated with fresh biomass of sugar beets at 60 dpi. Based on these results, the D. dipsaci population “Seeland” is suitable for breeding programs to detect resistance in sugar beet. After selecting candidate genotypes/varieties, these should be further evaluated for their field resistance in their targeted growing regions.

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