The present invention relates to isolated grapevine leafroll virus (GLRaV) proteins or polypeptides. The invention further relates to isolated DNA molecules which encode such proteins or polypeptides, in addition to assays and kits for detecting GLRaV infection in grape plants, and heterologous nucleic acid constructs, vectors, and transformation methods, comprising such GLRaV-encoding nucleic acids, as well as plants and plant parts comprising such constructs.
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