Pacific Northwest Plant Disease Management Handbook

Primrose (Primula spp.)-Tomato Spotted Wilt

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Latest revision: 
March 2024
Image related to Primrose (Primula spp.)-Tomato Spotted Wilt
Primula malacoides leaf infected with INSV.
Photo by Melodie Putnam, 2000.

See:

Greenhouse Plants, Ornamental - Impatiens Necrotic Spot

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.

Pscheidt, J.W., and Ocamb, C.M. (Senior Eds.). 2024 Pacific Northwest Plant Disease Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.

H - Home garden packaging commonly available.     O - Acceptable in organic production.