Leaf Crinkle and Distortion – This problem often occurs in the early stages of a poinsettia crop. There are many reasons a poinsettia could be losing its leaves. Fungal diseases can attack the foliage, stems, and roots of a plant. Angular leaf spotting, apparent only under cool temperatures. Height: up to 3m in the ground, but often pot-grown. Considered a rare disease and typically associated with outdoor poinsettia cultivation. Poinsettias with leaf spots should be sent to a diagnostic laboratory for accurate diagnosis. Biosecurity measures don’t just protect livestock and poultry; simple biosecurity measures can protect your family pet from pests and disease. Water-soaked foliage that eventually curls and dies may be the result of Rhizopus, a fungus that also attacks the stems and bracts. When stems are dark and discolored followed by foliage damage, Rhizoctonia may be the problem. Cause and Disease Development The causal fungus, Thielaviopsis basicola, has a wide host range and can infect a number of other greenhouse and field crops. Sources of bacteria may include geranium, croton ( Codiaeum variegatum ), crown of thorns ( E. milli ), and zebra plant ( Aphelandra squarrosa ). Some bracts may fail to color normally. Fungal Causes of a Poinsettia with Shriveled Leaves. Virus or viruslike disease Symptoms Host range and natural spread Comments on control; Mosaic (Poinsettia mosaic virus) Distortion of leaves and bracts. Mild mottling of leaves. This disease has occurred sporadically in greenhouse production. However, numerous plant diseases can act … No holiday décor is complete without at least one. Leaves may turn yellow and drop. Photo: www.gardeningwithsurgicalprecision.com Here’s a common Christmas plant problem: poinsettias (Euphorbia pulcherrima) whose lower leaves turn yellow and drop off, often within days of purchase. The poinsettia plant is well known as a festive plant that is often given as a gift during winter holidays. Yet the poinsettia has the reputation of being able to “hold on” for at least a month or two if given… There are many reasons why poinsettias start to lose leaves. They are somewhat rounded and irregular in shape, surrounded by a chlorotic tissue. Botrytis is the primary disease affecting poinsettia stems, leaves and bracts at all stages of production. The most common diseases poinsettia growers may encounter are: Alternaria leaf spots . Leaves appear to have an extremely rough texture often compared to alligator skin. Although the poinsettia is fairly easy to take care of, some problems can occur. This disease is Alternaria leaf spots begin as small lesions with a tan center and dark margins. Gain Control of Common Diseases. One of the most common issues is a disease known as alternaria leaf spot. Yet the poinsettia, while not necessarily the easiest houseplant of all, has the reputation … Common Names of Plant Diseases...G. W. Simone, primary collator (last update 11/08/00) BACTERIAL DISEASES Bacterial leaf spot Curtobacterium flaccumfaciens (Hedges 1922) Collins and Jones 1984 = Corynebacterium flaccumfaciens pv. Poinsettia are holiday decorations in public and personal spaces. Pathogens Root rot caused by Pythium is the most common disease affecting poinsettia production. Alternaria leaf spot, Xanthomonas leaf spot and poinsettia scab are three diseases that were recently diagnosed on poinsettias and are easily mistaken for one another. Commonly infected greenhouse ornamentals besides poinsettia include holly, pansy, and petunia. Symptoms most severe on plants grown at 61° to 68°F. Phytophthora and Rhizoctonia can also rot the roots of poinsettias, and under favorable conditions, move upward to affect the stem and lower branches. 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