List of poinsettia diseases

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 Bacterial leaf spot Pseudomonas marginalis Bacterial leaf spot Pseudomonas syringae subsp. syringae Bacterial leaf spot Xanthomonas campestris pv. poinsettiaecola Bacterial stem rot Erwinia carotovora subsp. carotovora Bacterial stem rot Erwinia chrysanthemi Crown gall Agrobacterium tumefaciens 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) Aerial blight Ceratobasidium ramicola (Rhizoctonia ramicola anamorph) Basal stem and crown rot Sclerotinia sclerotiorum Basal stem and root rot Ceratocystis sp. Basal stem and root rot 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 Crown and stem rot Nectria haematococca (Fusarium solani anamorph) Cutting rot Cylindrocladium scoparium Dieback Lasiodiplodia theobromae Botryosphaeria theobromae Gray mold Botryotinia ricini Gray mold Amphobotrys ricini anamorph) Botrytis ricini Gray mold Botryotinia fuckeliana (Botrytis cinerea anamorph) Leaf necrosis Cladosporium sp. Leaf necrosis Macrophoma sp. Leaf spot Alternaria euphorbiicola Leaf spot Ascochyta sp. Leaf spot Cercospora pulcherrima Leaf spot Curvularia sp. Leaf spot Drechslera sp. Leaf spot Myrothecium roridum Leaf spot Phyllosticta sp. Leaf spot Syspastospora parasitica Melanospora parasitica Leaf spot Stemphylium sp. Mushroom root rot Armillaria tabescens Powdery mildew Erysiphaceae spp. Root rot Phytophthora nicotianae Phytophthora nicotianae var. parasitica Root rot Pythium aphanidermatum Root rot Pythium debaryanum Root rot Pythium myriotylum Root rot Pythium perniciosum Root rot Pythium splendens Root rot Pythium ultimum Root and stem rot Thanatephorus cucumeris (Rhizoctonia solani anamorph) Rust Puccinia sp. 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. Stem rot Leptothyrium sp. Stem rot Phoma sp. Stem rot Phomopsis sp.

Nematodes, parasitic Disease Cause Image root-knot nematode Meloidogyne spp.

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 disordersBleaching necrosisAir pollutant injury from either chlorides (> 0.5 ppm), nitrogen dioxide (> 2-3 ppm) or sulfur dioxide (> 0.5 ppm) Bract necrosisPhysiological disorder favored by high humidity, heavy watering and high (ammoniacal) fertility rates in the last 4 weeks of production ChlorosisNitrogen 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 dropResponse 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 EdemaPhysiological Interveinal chlorosisMagnesium 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 eruptionHigh 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 necrosisPotassium 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 splittingPhysiological expression of flower initiation StipplingOzone injury (> 4 ppm) Terminal shoot necrosisExcessive soluble salts (> 800 EC X 102) White bractChilling injury occurring between

References

Common Names of Diseases, The American Phytopathological Society]