Until recently, it has been known to be a production problem only for poinsettias in Florida and Hawaii, where inoculum presumably survives from … Xanthomanas leaf spot on poinsettias begins 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. Schlumbergera, commonly referred to as Christmas cactus, derives its common name from its winter bloom period. 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. Yellow or tan spots can develop across the leaf. that spot leaves will also infect bracts. Beware: The Alternaria spp. 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. Photos: Jim Barrett. Yellow or tan spots can develop across the leaf. 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. Phytophthora and Rhizoctonia can also rot the roots of poinsettias, and under favorable conditions, move upward to affect the stem and lower branches. 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. Botrytis is the primary disease affecting poinsettia stems, leaves and bracts at all stages of production. As the disease progresses, spots turn brown and angular and can be confused with poinsettia scab. Whitefly . & Ruehle (46,60). As the disease progresses, spots turn brown and angular so could be confused with poinsettia scab. So, it's a good idea to send samples to … As with all cacti and succulents, the Christmas cactus is susceptible to disease. These pests can feed on many parts of the poinsettia plant or be associated with the production areas. 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. & Ruehle (46,60). A well-cared-for poinsettia can live for up to two years. Each of the six Christmas cactus species produces a different colored bloom, with red being the most common. Beware of this disease next year during poinsettia propagation season. Xanthomonas leaf spot on Poinsettias Symptoms of Xanthomonas campestris pv poinsettiicola begin with dull gray water-soaked areas. Pathogens Root rot caused by Pythium is the most common disease affecting poinsettia production. Plant fertilization requirements, nutrient monitoring and nutrient disorders have been a major research and … When poinsettia season comes, that also means the arrival of pests and diseases that affect the popular holiday crop. 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