Xanthomanas leaf spot on poinsettias begins with dull gray water soaked areas. Botrytis is the primary disease affecting poinsettia stems, leaves and bracts at all stages of production. These pests can feed on many parts of the poinsettia plant or be associated with the production areas. 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. Xanthomonas leaf spot on Poinsettias Symptoms of Xanthomonas campestris pv poinsettiicola begin with dull gray water-soaked areas. In the realm of insects and diseases, two of the most common poinsettia problems for growers are whitefly and Botrytis. & Ruehle (46,60). Photos: Jim Barrett. Until recently, it has been known to be a production problem only for poinsettias in Florida and Hawaii, where inoculum presumably survives from … Yellow or tan spots can develop across the leaf. However, poinsettias are susceptible to several diseases, mostly fungal and include root rot, root and stem rot, black root rot, scab, powdery mildew and blight. Alternaria leaf spot is one of several fungal diseases that can pounce on your poinsettias when your attention is diverted.The pathogen, Alternaria euphorbiicola (or certain other Alternaria species) most likely travels along with poinsettia cuttings, and attacks when the environmental conditions favor infection. As the disease progresses, spots turn brown and angular so could be confused with poinsettia scab. Identifying Poinsettia Nutritional Disorders By Brian Whipker, Ingram McCall and Jared Barnes To view tables and figures, click on the PDF link to the right. Plant fertilization requirements, nutrient monitoring and nutrient disorders have been a major research and … Pathogens Root rot caused by Pythium is the most common disease affecting poinsettia production. However, as a native to Mexico they can struggle to survive as a houseplant as it can be difficult to provide the right environmental conditions. A well-cared-for poinsettia can live for up to two years. that spot leaves will also infect bracts. Whitefly . When poinsettia season comes, that also means the arrival of pests and diseases that affect the popular holiday crop. & Ruehle (46,60). Phytophthora and Rhizoctonia can also rot the roots of poinsettias, and under favorable conditions, move upward to affect the stem and lower branches. Yellow or tan spots can develop across the leaf. Poinsettia scab is a spot anthracnose disease caused by the fungus Sphaceloma poinsettiae Jenk. Schlumbergera, commonly referred to as Christmas cactus, derives its common name from its winter bloom period. So, it's a good idea to send samples to … As the disease progresses, spots turn brown and angular and can be confused with poinsettia scab. Each of the six Christmas cactus species produces a different colored bloom, with red being the most common. 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. Poinsettia Insect & Mite Management A wide variety of insect and mite pests have been found in association with poinsettia production both in shade houses and in the greenhouse ( Table 1 ). Beware: The Alternaria spp. Beware of this disease next year during poinsettia propagation season. As with all cacti and succulents, the Christmas cactus is susceptible to disease. Fungus Sphaceloma poinsettiae Jenk good idea to send samples to … a well-cared-for poinsettia can for! It 's a good idea to send samples poinsettia diseases pictures … a well-cared-for poinsettia can live for up to two.. Poinsettia can live for up to two years derives its common name from its winter bloom period common poinsettia for! 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