A method for establishing, restoring or increasing the Rz2 gene mediated resistance to the Beet necrotic yellow vein virus (BNYVV) in the target plant is enabled via the identification and provision of a gene which modulates said resistance according to the invention. In particular, the BNYVV resistance mediated by the Rz2 resistance gene depends on the presence of the gene of the present invention. The gene being involved in conferring said resistance, and embodiments of the present invention that are described in the preceding, offer additional applications, e.g., the use of the resistance modifying gene allele in cis-genetic or trans-genetic approaches, with the goal of developing new resistant cultivars.
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