Venturia inaequalis rasu sastāva raksturojums uz diferencējošiem Malus genotipiem 2023. g. veģetācijas sezonā = Characterization of the composition of V. inaequalis races on the differential Malus genotypes in the 2023
2023
Sokolova, Olga
Apple scab caused by Venturia inaequalis is the most economically important disease of apples (Malus) worldwide. Recombination and changes in pathogen populations is facilitated by annual sexual reproduction, which results in high pathogen variability and better adaptability to resistant cultivars. Due to rapid evolution, new races of V. inaequalis overcome resistance genes in Malus genotypes. Differential Malus genotypes – apple cultivars and hybrids with a specific R gene – are used to identify the racial composition of the causative agents. Fifteen differential Malus genotypes, obtained within the international “Vinquest” initiative, were planted in the germplasm collection sector of the Institute of Horticulture, in Dobele, Latvia during 2016. Apple scab symptoms on the leaves were scored according to the methodology used in the “Vinquest” network. The aim of the study is to collect the information about V. inaequalis races that occur on the differential Malus genotypes at the orchard established at the Institute of Horticulture in 2023. Four races of V. inaequalis were found to be established in Latvia, and they have overcome the genes Rvi1, Rvi3, Rvi4, and Rvi8.
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Editeur Latvijas Biozinātņu un tehnoloģiju universitāte
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