List of poinsettia diseases

This article is a list of diseases of poinsettias (Euphorbia pulcherrima).

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1 Bacterial diseases
2 Fungal diseases
3 Nematodes, parasitic
4 Viral and viroid diseases
5 Miscellaneous diseases and disorders
6 References

Bacterial diseases

Bacterial diseases
Bacterial leaf spot	Curtobacterium flaccumfaciens = Corynebacterium flaccumfaciens pv. poinsettiae Pseudomonas cichorii P. marginalis P. syringae subsp. syringae Xanthomonas campestris pv. poinsettiaecola
Bacterial stem rot	Erwinia carotovora subsp. carotovora Erwinia chrysanthemi
Crown gall	Agrobacterium tumefaciens
Greasy center	Pseudomonas viridiflava

Fungal diseases

Fungal diseases
Anthracnose	Colletotrichum capsici Colletotrichum dematium Glomerella cingulata Colletotrichum gloeosporioides [anamorph]
Aerial blight	Ceratobasidium ramicola Rhizoctonia ramicola [anamorph]
Basal stem and crown rot	Sclerotinia sclerotiorum
Basal stem and root rot	Ceratocystis sp. Thielaviopsis basicola [anamorph] Chalara elegans [synanamorph]
Black rot	Botryodiplodia sp.
Bract, flower and leaf blight	Phytophthora drechsleri
Bract spot	Corynespora cassiicola
Crown and stem rot	Fusarium oxysporum Nectria haematococca Fusarium solani [anamorph]
Cutting rot	Cylindrocladium scoparium
Dieback	Lasiodiplodia theobromae = Botryosphaeria theobromae
Gray mold	Botryotinia ricini Amphobotrys ricini [anamorph] = Botrytis ricini Botryotinia fuckeliana Botrytis cinerea [anamorph]
Leaf necrosis	Cladosporium sp. Macrophoma sp.
Leaf spot	Alternaria euphorbiicola Ascochyta sp. Cercospora pulcherrimae Curvularia sp. Drechslera sp. Myrothecium roridum Phyllosticta sp. Syspastospora parasitica = Melanospora parasitica Stemphylium sp.
Mushroom root rot	Armillaria tabescens
Powdery mildew	Oidium sp. Erysiphe sp. Microsphaera euphorbiae
Root rot	Phytophthora nicotianae = Phytophthora nicotianae var. parasitica Pythium aphanidermatum Pythium debaryanum Pythium myriotylum Pythium perniciosum Pythium splendens Pythium ultimum
Root and stem rot	Thanatephorus cucumeris Rhizoctonia solani [anamorph]
Rust	Puccinia sp. Uromyces euphorbiae = Uromyces proëminens var. poinsettiae
Scab	Sphaceloma poinsettiae
Stem gall	Nectriella pironii Kutilakesa pironii [anamorph]
Stem rot	Botryosphaeria ribis Diplodia sp. Leptothyrium sp. Phoma sp. Phomopsis sp.

Nematodes, parasitic

Nematodes, parasitic
Root knot nematode	Meloidogyne spp.

Viral and viroid diseases

Viral and viroid diseases
Mosaic	genus Bigeminivirus, 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 Sulfur deficiency causing young leaf yellowing Zinc deficiency producing general yellowing and stunting of new leaves
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 Ammonium toxicity produces V-shaped chlorotic bands starting at the leaf tip and accompanied by downward leaf cupping
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) Lithium toxicity on older leaves (2 ppm)
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)

References

Common Names of Diseases, The American Phytopathological Society

Category: Lists of plant diseases

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