European Journal of Plant Pathology (2021) 161, 63-71

Alan Storelli, Sebastian Kiewnick, Matthias Daub, Anne-Katrin Mahlein, Mario Schumann, Werner Beyer and Andreas Keiser (2021)
Virulence and pathogenicity of four Ditylenchus dipsaci populations on sugar beet
European Journal of Plant Pathology 161 (1), 63-71
Abstract: 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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Database assignments for author(s): Sebastian Kiewnick, Anne-Katrin Mahlein, Mario Schumann

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ditylenchus dipsaci	Beet/sugarbeet (Beta vulgaris)	Germany
	Ditylenchus dipsaci	Beet/sugarbeet (Beta vulgaris)	Switzerland