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Destroy infected plants and crop debris. Apply a fungicide to protect plants. Yellow spots form on the upper surface of leaves. The red bracts of a poinsettia around its tiny cyathia. And some of these are variegated, with marbled, mottled, or speckled patterns. Apply a fungicide to protect plants. A festive houseplant during the winter holiday season, the poinsettia (Euphorbia pulcherrima) grows in U.S. Department of Agriculture plant hardiness zones 9 through 11. If soluble salts become excessive, leach heavily, wait overnight, and leach again. Informational table showing disease name, symptoms, pathogen/cause, and management of Poinsettia diseases. Explore {{searchView.params.phrase}} by color family {{familyColorButtonText(colorFamily.name)}} As the disease progresses, spots turn brown and angular so could be confused with poinsettia scab. Nov 22, 2016 - Discover the world of new, different & unusual Poinsettias. Root and top growth is restricted. It might be decaying of its roots, infecting leaves, causing yellowish color, mushy spots and holes or infecting its stem. Use of molybdenum-containing fertilizer or a complete minor element supplement, or add sodium molybdate to soluble fertilizer. Wounded stems of older plants develop soft rot and lodge. Poinsettia pests and diseases Purchasing a pot grown Poinsettia is as much a part of modern Christmas celebrations as it is to buy a trimmed fir tree. Additional Resources: Poinsettia Diseases Publication, PPFS-GH-06. Yellow or tan spots can develop across the leaf. Discard infected cuttings and infested media. Sign up now to get our FREE breaking news coverage delivered right to your inbox. Early in the season, cuttings wilt and yellow. Cultivated varieties are available with white, pink, mottled, and striped bracts, though the solid red varieties remain in greatest demand during the Christmas season. Continue scouting throughout the season, especially as plants are being spaced. Overview Information Poinsettia is a flowering plant. Defoliation and death of branches occur above cankers that girdle stems. Pests and diseases cause harm to the plant. Early in season, the rooted cuttings are stunted, yellow, and wilting. As the top-selling potted plant in the United States, the poinsettia (Euphorbia pulcherrima) is historically rooted in the political world. Lower stems below ground may have a shredded appearance. Use only sterile soil and clean tools, and hang up hose ends. Poinsettia flowers belong to the Euphorbia family and are related to the Euphorbia polychrome or the Cushion Spurge. Develop from nutrient deficiencies and excesses, especially as plants are at for. Infecting its stem, causing yellowish color, mushy spots and holes or infecting its stem W.! Be discarded, especially ammonium toxicity to attack from insect pests and mites all season long so... 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