Mild mottling of leaves. Yet the poinsettia has the reputation of being able to “hold on” for at least a month or two if given… 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. Yet the poinsettia, while not necessarily the easiest houseplant of all, has the reputation … 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. Some bracts may fail to color normally. There are many reasons why poinsettias start to lose leaves. Leaves appear to have an extremely rough texture often compared to alligator skin. Alternaria leaf spots begin as small lesions with a tan center and dark margins. Sources of bacteria may include geranium, croton ( Codiaeum variegatum ), crown of thorns ( E. milli ), and zebra plant ( Aphelandra squarrosa ). 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. 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. Poinsettia are holiday decorations in public and personal spaces. This disease has occurred sporadically in greenhouse production. They are somewhat rounded and irregular in shape, surrounded by a chlorotic tissue. Considered a rare disease and typically associated with outdoor poinsettia cultivation. Commonly infected greenhouse ornamentals besides poinsettia include holly, pansy, and petunia. Leaves appear to have an extremely rough texture often compared to alligator skin. There are many reasons a poinsettia could be losing its leaves. Fungal Causes of a Poinsettia with Shriveled Leaves. Angular leaf spotting, apparent only under cool temperatures. Height: up to 3m in the ground, but often pot-grown. Symptoms most severe on plants grown at 61° to 68°F. Gain Control of Common Diseases. This disease is Although the poinsettia is fairly easy to take care of, some problems can occur. When stems are dark and discolored followed by foliage damage, Rhizoctonia may be the problem. However, numerous plant diseases can act … Leaves may turn yellow and drop. No holiday décor is complete without at least one. How to create a cottage garden Agricultural pests and harmful fungi, viruses and bacteria can attack your crop at any time. The poinsettia plant is well known as a festive plant that is often given as a gift during winter holidays. Leaf Crinkle and Distortion – This problem often occurs in the early stages of a poinsettia crop. Botrytis is the primary disease affecting poinsettia stems, leaves and bracts at all stages of production. Fungal diseases can attack the foliage, stems, and roots of a plant. Water-soaked foliage that eventually curls and dies may be the result of Rhizopus, a fungus that also attacks the stems and bracts. Virus or viruslike disease Symptoms Host range and natural spread Comments on control; Mosaic (Poinsettia mosaic virus) Distortion of leaves and bracts. Phytophthora and Rhizoctonia can also rot the roots of poinsettias, and under favorable conditions, move upward to affect the stem and lower branches. Pathogens Root rot caused by Pythium is the most common disease affecting poinsettia production. Biosecurity measures don’t just protect livestock and poultry; simple biosecurity measures can protect your family pet from pests and disease. 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