Phytoplasma and Candidatus Liberibacter solanacearum survey reveal wide-spread aster yellows infections in Belgian carrot (Daucus carota L.) fields

Kris De Jonghe, Inge De Roo, Bart Declercq, Danny Callens, Kurt Demeulemeester, Martine Maes

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureC3: Congres abstract


In the EPPO region, an increasing number of signals and official reports (Finland, Norway, France, Germany, Sweden, Spain, UK) indicate that both phytoplasma and Liberibacter problems and their respective vectors are gaining importance and cause actual damage in carrot production fields.
To address the plant health impact of these harmful organisms in Belgium, especially those of the regulated pathogens that belong to those groups, an extensive pathogen and vector survey in potato and carrot production facilities is organized and conducted. The main objective of the project (FYLIBER) is to deliver a status report for regulated phytoplasmas such as stolbur (‘Ca. Phytoplasma solani’) and ‘Ca. Liberibacter solanacearum’ in Belgium, establishing a sound platform for the plant health policy and allowing to react quickly when a real risk on possible outbreaks in potato or carrot would be identified.
One year after the start of the project, 302 potato samples and 116 carrot samples, originating from 12 and 14 geographic locations, respectively were screened for the presence of phytoplasmas (generic nested PCR with primer sets P1/P7 and fU5/rU3) or ‘Ca. Liberibacter solanacearum’ (specific PCR with primer set LsoF/Oi2c). Additionally, a vector monitoring was conducted by means of yellow trays in 5 selected potato fields and 7 carrot fields.
No regulated phytoplasma or ‘Ca. Liberibacter solanacearum’ were encountered during the survey so far. However, in 6 carrot production fields, a considerate number of plants with yellowing, reddening and leaf malformation were seen. Additionally, many of the plants showing these leaf symptoms also showed hairy root development on the carrot taproot. The damage of these plants can be directly linked to a widespread presence of Aster Yellows phytoplasma (‘Ca. Phytoplasma asteris’) in our carrot production fields. Further assessment is needed to assess the economic impact on yield and quality, not only for the fresh market but also in relation to the influence of the hairy roots interfering with the carrot cleaning and packaging of the carrot processing industry.
Oorspronkelijke taalEngels
TitelAbstract book 68th International Symposium on Crop Protection
Aantal pagina’s1
PublicatiestatusGepubliceerd - 17-mei-2016
Evenement68th International Symposium on Crop Protection - Ghent University, Gent, België
Duur: 17-mei-201617-mei-2016

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