The CTPS "beets and industrial chicory" Section met on October 15, 2020 in a context of unprecedented virus yellows expression linked tothe ban of the use of neonicotinoids in seed treatment and under particularly favorable conditions for aphids vectors of these viruses this year.
Because of this risk of uncontrolled yellows, the future stakes for the official evaluation of varieties for the registration are enormous ; indeed, it will be necessary to continue to be able to evaluate reliably candidate varieties for the multiple characters of interest but also to be able to enhance any varietal progress in tolerance / resistance to yellows or their vectors.
As a reminder, the CTPS "beet and industrialchicory" Section hadinitiated as early as 2019, in dedicated trials conducted in partnership with the ITB, the evaluation of 3 varieties for which the applicantclaimed a good tolerance to beetyellow virus. In 2020, 2 new varietieswerealsofiledwiththis claim. The trials conductedin 2019 and 2020 have showntheirinterest and theirlimits. Whiletheyrevealedvarietalbehaviour in relation to the 2 virusestested out of the 4 present on the plains in 2020, improvements in the experimental system are expectedin 2021 (more virusestested, more experimental sites, etc.). Financial support from the PNRI (National Research and Innovation Plan) has been requested in this respect.
To date, no experimentalvariety has fullypreservedits root and sugaryield in the presence of yellowing. Reducing the impact of yellowing on beetcropswillnecessarilydepend on severalfactors:tolerantvarieties, agronomic practices thatreduceaphid pressure, biocontrol, etc.
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