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Symptoms of Citrus exocortis viroid (CEVd) infection on Etrog citron (Citrus medica L.) at 30 and 90 days post‐inoculation (dpi), and accumulation of the viroid in four independent plants at 30 dpi revealed by Northern blot. Symbols ‘–’ and ‘+’ refer to the controls from healthy and CEVd‐infected plants, respectively.
