Biology:List of poinsettia diseases

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Poinsettia growing in Barlovento, Canary Islands

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

Bacterial diseases

Disease Cause Image
Bacterial leaf spot Curtobacterium flaccumfaciens = Corynebacterium flaccumfaciens pv. poinsettiae
Bacterial leaf spot Pseudomonas cichorii
Hibiscus Bacterial leaf spot caused by Pseudomonas cichorii (5684575818).jpg
Bacterial leaf spot Pseudomonas marginalis
Pseudomonas marginalis, bladvuur op witlof (2).jpg
Bacterial leaf spot Pseudomonas syringae subsp. syringae
Bacterial leaf spot Xanthomonas campestris pv. poinsettiaecola
Bacterial stem rot Erwinia carotovora subsp. carotovora
Napa Cabbage (Won Bok, Chinese Cabbage, Celery Cabbage) Bacterial soft rot (35468272752).jpg
Bacterial stem rot Erwinia chrysanthemi
Crown gall Agrobacterium tumefaciens
Agrobacterium tumefaciens Forsythie.jpg
Greasy center Pseudomonas viridiflava

Fungal diseases

This also includes oomycetes

Disease Cause Image
Anthracnose Colletotrichum capsici
Anthracnose Colletotrichum dematium
Anthracnose Glomerella cingulata (Colletotrichum gloeosporioides anamorph)
Bitter rot.jpg
Aerial blight Ceratobasidium ramicola (Rhizoctonia ramicola anamorph)
Basal stem and crown rot Sclerotinia sclerotiorum
Sclerotinia sclerotiorum at Phaseolus vulgaris, sclerotiënrot stamsperzieboon.jpg
Basal stem and root rot Ceratocystis sp.
Chancre du platane.jpg
Basal stem and root rot Thielaviopsis basicola anamorph / Chalara elegans synanamorph
Carrot10.jpeg
Black rot Botryodiplodia sp.
Oil Palm Botryodiplodia (36329895720).jpg
Bract, flower and leaf blight Phytophthora drechsleri
Bract spot Corynespora cassiicola
Corynespora cassiicola Ring-Spot Symptoms in Tomato Leaves.png
Crown and stem rot Fusarium oxysporum
Tomaquera amb Fusarium HV.JPG
Crown and stem rot Nectria haematococca (Fusarium solani anamorph)
Cutting rot Cylindrocladium scoparium
Calonectria kyotensis.jpg
Dieback Lasiodiplodia theobromae = Botryosphaeria theobromae
Papaya (Carica papaya) Lasiodiplodia theobromae sporulating in fruit lesion.jpg
Gray mold Botryotinia ricini
Gray mold Amphobotrys ricini anamorph) = Botrytis ricini
Gray mold Botryotinia fuckeliana (Botrytis cinerea anamorph)
Botrytis-rot op appel Goudreinet (Botryotinia fuckeliana).jpg
Leaf necrosis Cladosporium sp.
Taro Cladosporium leaf spot (12227195866).jpg
Leaf necrosis Macrophoma sp.
Leaf spot Alternaria euphorbiicola
Leaf spot Ascochyta sp.
Ascochyta.frangulina.-.lindsey.jpg
Leaf spot Cercospora pulcherrima
Leaf spot Curvularia sp.
Leaf spot Drechslera sp.
Leaf spot Myrothecium roridum
Leaf spot Phyllosticta sp.
Phyllosticta.galeopsidis.-.lindsey.jpg
Leaf spot Syspastospora parasitica = Melanospora parasitica
Leaf spot Stemphylium sp.
Stemphylium.sarciniforme.-.lindsey.jpg
Mushroom root rot Armillaria tabescens
Armillaria tabescens.JPG
Powdery mildew Oidium sp.
Powdery mildew Erysiphe sp.
Oak Mildew.JPG
Powdery mildew Microsphaera euphorbiae
Root rot Phytophthora nicotianae = Phytophthora nicotianae var. parasitica
Black Shank on Tobacco Stem.jpg
Root rot Pythium aphanidermatum
Root rot Pythium debaryanum
Root rot Pythium myriotylum
Root rot Pythium perniciosum
Root rot Pythium splendens
Awa Pythium Root Rot -- wilt on young plant.jpg
Root rot Pythium ultimum
Root and stem rot Thanatephorus cucumeris (Rhizoctonia solani anamorph)
Root of sugarbeet root rot.jpg
Rust Puccinia sp.
Puccinia aristidae.jpg
Rust Uromyces euphorbiae = Uromyces proëminens var. poinsettiae
Scab Sphaceloma poinsettiae
Stem gall Nectriella pironii (Kutilakesa pironii anamorph)
Stem rot Botryosphaeria ribis
Stem rot Diplodia sp.
Sweetpotato Java black rot (31033344776).jpg
Stem rot Leptothyrium sp.
Stem rot Phoma sp.
Phoma a cafet.jpg
Stem rot Phomopsis sp.
Eggplant phomopsis 1 (5815759324).jpg

Nematodes, parasitic

Disease Cause Image
root-knot nematode Meloidogyne spp.
Nematode nodules.jpg

Viral and viroid diseases

Disease Cause Image
mosaic Euphorbia mosaic virus
mosaic Poinsettia mosaic virus
(symptomless) Poinsettia latent virus

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