Symptoms The fairy primrose (Primula malacoides) shows stunting, yellowing, and withering of leaves when infected with Tomato spotted wilt virus. TSWV is usually fatal in the German primrose (P. obconica) whose leaves develop marginal chlorosis, necrotic spotting, and wilting. Stunting, necrotic veins, irregular necrotic lesions, and mottling may appear on Chinese primrose (P. sinensis) infected with Impatiens necrotic spot virus.
Reference Margery, D. and Chase, A.R. 1992. Ball Field Guide to Diseases of Greenhouse Ornamentals. Ball Publishing.