top of page


Key warning symptoms:

  • Mottle

  • Shoestringing

  • Deformation

  • Distorted bracts

Poinsettia mosaic virus is widespread, with some poinsettia varieties nearly 100% infected. But the virus apparently does the plants no harm under good growing conditions. Under poor conditions, such as too-cool temperatures or insufficient light, the virus can cause mottled patterns on leaves or distortion of the bracts.

Poinsettia mosaic virus is not responsible for many of the apparent virus symptoms seen in poinsettias. Even when a plant tests positive for the virus, the symptoms may be due to a nutritional problem or other cause.


Fungal Diseases - PCR

  • Botrytis cinerea (Gray mold)

  • Colletotrichum spp. (Anthracnose)

  • Fusarium oxysporum (Crown/stem rot)

  • Fusarium solani (Crown/stem rot)

  • Pythium spp. (Root rot) 

  • Pythium aphanidermatum (Root rot)

  • Pythium ultimum (Root rot)

  • Sclerotinia sclerotiorum (Basal stem and crown rot)


Bacterial Diseases - PCR

  • Erwinia carotovora (Bacterial stem rot)

  • Pseudomonas syringae pv.syringae (Leaf spot)

  • Xanthomonas campestris (Xc) (Leaf spot)


Poinsettia Virus Screen

  • Cucumber mosaic virus (CMV) ELISA 

  • Impatiens necrotic spot virus (INSV) ELISA

  • Poinsettia mosaic virus (PnMV) ELISA

  • Potyvirus group test (Poty) PCR

  • Tomato spotted wilt virus (TSWV) ELISA

bottom of page