This disease is Botrytis is the primary disease affecting poinsettia stems, leaves and bracts at all stages of production. Some bracts may fail to color normally. This disease has occurred sporadically in greenhouse production. Fungal Causes of a Poinsettia with Shriveled Leaves. Mild mottling of leaves. Fungal diseases can attack the foliage, stems, and roots of a plant. Sources of bacteria may include geranium, croton ( Codiaeum variegatum ), crown of thorns ( E. milli ), and zebra plant ( Aphelandra squarrosa ). Height: up to 3m in the ground, but often pot-grown. Photo: .gardeningwithsurgicalprecision.com I’ve received several emails recently from gardeners struggling with poinsettias (Euphorbia pulcherrima) whose lower leaves turned yellow and dropped off, often within days of purchase. There are many reasons a poinsettia could be losing its leaves. The most common diseases poinsettia growers may encounter are: Alternaria leaf spots . Phytophthora and Rhizoctonia can also rot the roots of poinsettias, and under favorable conditions, move upward to affect the stem and lower branches. Although the poinsettia is fairly easy to take care of, some problems can occur. Angular leaf spotting, apparent only under cool temperatures. 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. Leaf Crinkle and Distortion – This problem often occurs in the early stages of a poinsettia crop. Poinsettias with leaf spots should be sent to a diagnostic laboratory for accurate diagnosis. 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. Poinsettia are holiday decorations in public and personal spaces. Pathogens Root rot caused by Pythium is the most common disease affecting poinsettia production. Yet the poinsettia, while not necessarily the easiest houseplant of all, has the reputation … Alternaria leaf spots begin as small lesions with a tan center and dark margins. Leaves appear to have an extremely rough texture often compared to alligator skin. Water-soaked foliage that eventually curls and dies may be the result of Rhizopus, a fungus that also attacks the stems and bracts. Commonly infected greenhouse ornamentals besides poinsettia include holly, pansy, and petunia. They are somewhat rounded and irregular in shape, surrounded by a chlorotic tissue. Gain Control of Common Diseases. Virus or viruslike disease Symptoms Host range and natural spread Comments on control; Mosaic (Poinsettia mosaic virus) Distortion of leaves and bracts. However, numerous plant diseases can act … There are many reasons why poinsettias start to lose leaves. One of the most common issues is a disease known as alternaria leaf spot. 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. When stems are dark and discolored followed by foliage damage, Rhizoctonia may be the problem. Leaves appear to have an extremely rough texture often compared to alligator skin. How to create a cottage garden Agricultural pests and harmful fungi, viruses and bacteria can attack your crop at any time. Yet the poinsettia has the reputation of being able to “hold on” for at least a month or two if given… 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. 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