List of poinsettia diseases
This article is a list of diseases of poinsettias (Euphorbia pulcherrima).
Bacterial diseases
| Bacterial diseases | |
|---|---|
| Bacterial leaf spot | Curtobacterium flaccumfaciens = Corynebacterium flaccumfaciens pv. poinsettiae Pseudomonas cichorii |
| Bacterial stem rot | Erwinia carotovora subsp. carotovora Erwinia chrysanthemi |
| Crown gall | Agrobacterium tumefaciens |
| Greasy center | Pseudomonas viridiflava |
Fungal diseases
| Fungal diseases | |
|---|---|
| Anthracnose |
Colletotrichum capsici |
| Aerial blight |
Ceratobasidium ramicola |
| Basal stem and crown rot | |
| Basal stem and root rot |
Ceratocystis sp. |
| Black rot |
Botryodiplodia sp. |
| Bract, flower and leaf blight | |
| Bract spot | |
| Crown and stem rot |
Fusarium oxysporum |
| Cutting rot |
Cylindrocladium scoparium |
| Dieback |
Lasiodiplodia theobromae |
| Gray mold |
Botryotinia ricini |
| Leaf necrosis |
Cladosporium sp. |
| Leaf spot |
Alternaria euphorbiicola |
| Mushroom root rot | |
| Powdery mildew |
Oidium sp. |
| Root rot |
Phytophthora nicotianae |
| Root and stem rot |
Thanatephorus cucumeris |
| Rust |
Puccinia sp. |
| Scab | |
| Stem gall |
Nectriella pironii |
| Stem rot |
Botryosphaeria ribis |
Nematodes, parasitic
| Nematodes, parasitic | |
|---|---|
| Root knot nematode | Meloidgyne spp. |
Viral and viroid diseases
| Viral and viroid diseases | |
|---|---|
| Mosaic | genus Begomovirus, Euphorbia mosaic virus (EuMV)
Poinsettia mosaic virus (possible tymovirus) (PnMV) |
| (symptomless) | Poinsettia (?) alphacryptovirus (PnCV) |
Miscellaneous diseases and disorders
| Miscellaneous diseases and disorders | |
|---|---|
| Bleaching necrosis | Air pollutant injury from either chlorides (> 0.5 ppm), nitrogen dioxide (> 2-3 ppm) or sulfur dioxide (> 0.5 ppm) |
| Bract necrosis | Physiological disorder favored by high humidity, heavy watering and high (ammoniacal) fertility rates in the last 4 weeks of production |
| Chlorosis | Nitrogen deficiency producing a general foliar yellowing Molybdenum deficiency affecting mature young leaves and producing upward leaf roll |
| Cyathia drop | Response to low light conditions, dryness and/or high temperatures at the end of the production cycle |
| Dropping (epinasty) | Ethylene toxicity (< 1 ppm) or low temperature chilling |
| Edema | Physiological |
| Interveinal chlorosis | Magnesium deficiency, initiating on older leaves Manganese deficiency, initiating on young mature leaves |
| Latex eruption | High internal turgor pressure associated with certain cultivars, high humidity, high moisture availability, low temperatures and/or mechanical abrasion |
| Leaf glazing (bronzing) | Peroxyacetyl nitrate (PAN) injury to the lower epidermis
(> 0.2 ppm) |
| Marginal necrosis | Potassium deficiency
Fluoride toxicity on tips and margins of young leaves and bracts (0.4 ppm in water) |
| Stem splitting | Physiological expression of flower initiation |
| Stippling | Ozone injury (> 4 ppm) |
| Terminal shoot necrosis | Excessive soluble salts (> 800 EC X 102) |
| White bract | Chilling injury occurring between 0–10 °C (32–50 °F) |