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