Distribution and frequency of tomato ringspot virus (ToRSV) in different varieties of Rubus idaeus in the Maule Region, Chile oleh Gloria Rossana González Silva, Cynthia Macarena Concha Espinoza, Myriam Andrea Valenzuela Bustamante, Luzmira Cecilia Cordero Alday, José Newthon Pico Mendoza, Pablo Alfredo Cáceres Ruz, Rolando García González