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