Botryotinia ricini

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
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

"font-style : italic;">Botryosphaeria theobromae

Gray mold

Botryotinia ricini
Amphobotrys ricini [anamorph]

"font-style : italic;">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

"font-style : italic;">Melanospora parasitica
Stemphylium sp.

Mushroom root rot

Armillaria tabescens
Powdery mildew

Oidium sp.
Erysiphe sp.
Microsphaera euphorbiae
Root rot

Phytophthora nicotianae

"font-style : italic;">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

"font-style : italic;">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 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
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

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