High pH. Favored by excess moisture and overcrowding of plants. Molybdenum deficiencies can cause distorted leaves due to the failure of the interveinal areas to expand normally. May be symptomless in poinsettias. Box 1106 New Haven, CT 06504-1106. Plant Disease Management on Poinsettias The most serious disease problems of poinsettias are pythium root rot, rhizoctonia root and stem rot, botrytis, powdery mildew, fungal leaf spots, and bacterial issues. ... conditions become favorable for bacterial growth (warm temperatures and high humidity), the bacteria multiply and cause disease. LEARN HOW TO STOP THE INVASIVE SPOTTED LANTERNFLY, Coronavirus: Information and resources for the Extension Community, Botrytis flower blight. Molybdenum deficiency, Prepared by Gary W. Moorman, Professor of Plant Pathology. 2001). Conductivity readings at or above 1.0 mS for soil or 2.5 mS for soilless mixes (saturated paste extract) are excessive. We have described the major poinsettia diseases that are widespread in the industry. Cause and Disease Development Botrytis cinerea causes one of the most common diseases of all greenhouse crops. When poinsettias get problems, they always seem to hit hard and fast. Don't put poinsettias in cold, drafty, or hot places. The adults are more of a nuisance than a real problem, but the larvae do feed on plant tissue. These plants produce colorful bracts and brighten rooms for the holidays, so it can cause concern when whiteflies infest a poinsettia. Do not over-water during periods of low light and low temperature. Poinsettias in growing mixes that do not contain mineral soil are unlikely to develop Thielaviopsis root rot. Poinsettias are very sensitive to cold temperatures and drafts. Favored by low light and low temperature in late fall, acidic potting mix, and exclusive use of ammonium nitrogen source. Over-watering will cause the lower leaves to turn yellow and drop. Lower leaves yellow while leaf margins burn. Be careful when transporting poinsettias from the shop to your home in the winter, as the cold outdoor temperatures can damage the foliage. It can be troublesome in all stages of poinsettia production. Entering your postal code will help us provide news or event updates for your area. The most important root disease affecting poinsettia is Pythium root rot caused by several species of Pythium the most common being P. aphanidermatum, but P. irregulare, P. cryptoirregulare and P. ultimum also cause loss. In some people, it can cause skin rash, eye irritation, and irritation or burns to the mouth. If it is below 50°F or windy outside then put your plant inside a loose-fitting bag. Learn more about Poinsettia uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain Poinsettia There are also many dwarf varieties available that grow to only 1–2m. Immediately discard infected plants. Source: Premier Tech How to Monitor Root Diseases All root rot diseases will ultimately result in … In soil. The disease started on infected cuttings and continued through the entire production cycle. Poinsettias are cheery plants that are widely grown indoors over Christmas for their brightly coloured bracts. Growers can reduce the potential of Botrytis by following a few crucial steps, Brotherton says. They are often disposed of once they start to fade, but with a little care, you can keep them all year and the bracts will colour up again the following year. Plants are stunted. Use sterile propagation media. Do not over-water or over-fertilize plants. In nutrition experiments with the varieties Paul Mikkelsen, Annette Hegg and Eckespoint C-l an acid substrate increased the damage, owing to the relative insolubility (and thus unavailability) of Mo under these conditions. ... What is the problem? Further, leftover solution in the spray tank can cause trouble in the BCA areas when the tank is used again, and other chemistries are added that are not compatible. You must have JavaScript enabled in your browser to utilize the functionality of this website. Continue scouting throughout the season, especially as plants are being spaced. Poinsettias can, at times, be a problematic crop, but beingaware of the more common nutritional, physiological and insect anddisease-related problems encountered during production can help reduce theheadaches. Young plants frequently are killed. Poinsettia used to be considered a poisonous plant. Williams says different root rot pathogens cause trouble depending on where you currently are in the production cycle. STORIES, MYTHS, LEGENDS AND THE FOLKLORE OF HELLEBORE. But it’s not just contact with the milky sap that can cause problems. Impatiens Necrotic Spot … ... soil becomes dry to the touch, water the plant until water begins to flow out the bottom of the pot. The adult white fly looks like a small fly covered with white powder. Scab caused by Sphaceloma poinsettiae, normally a disease problem only in states like Florida and Ha… PP043 (3/01R) By Dr. Sharon M. Douglas Department of Plant Pathology and Ecology The Connecticut Agricultural Experiment Station 123 Huntington Street P. O. Under dry conditions, the pith of the lower stem is brown and the stem has a gray canker. Don't put poinsettias in cold, drafty, or hot places. If soluble salts become excessive, leach heavily, wait overnight, and leach again. Grow at higher temperatures. Obtain virus‑free plants. Telephone: (203) 974-8601 Fax: (203) 974-8502 Email: Sharon.Douglas@ct.gov. Use only sterile soil and clean pots and tools. The base of infected stems appear soft and wet. High pH. problem in the commercial pro-duction of poinsettias, especially in greenhouses. Pest pressure varies by region in greenhouse poinsettias, but the most common insects include whiteflies, mealybugs, mites and thrips. And finally, a phytoplasma organism found associated with poinsettias provides evidence that some host/pathogen relationships can actually be economically beneficial. Downy Mildews of Ornamental Plants. Clean the greenhouse covering and space plants well. Poinsettias are a favorite Christmas plant but widely misunderstood. Yellow spots form on the upper surface of leaves. Garden Retailers and Late Blight Disease. Edema and Intumescence. A Poinsettia Problem Diagnostic Key is available online from North Carolina State University (68). Do not wet the foliage when irrigating. Why do we need this? The star feature of poinsettias … The first signs are generally a lack of good green leaf color, progressing to the classic bronzing symptoms that mites cause as they feed on the bottom side of the leaves. Early in the season, cuttings wilt and yellow. Longitudinal water-soaked streaks on stems and spots on leaves. Over-watering will cause the lower leaves to turn yellow and drop. Several diseases affect production of poinsettia, including foliar diseases such as Botrytis gray mold, powdery mildew, Alternaria blight, Xanthomonas blight, Erwinia blight, Phytophthora blight, and root diseases such as Pythium, Phytophthora and Rhizoctonia root rot. This disease thrives on dense-canopied plants such as poinsettias that hold a significant amount of moisture. With a wide host range, Rhizoctonia can cause a variety of diseases including stem rot, root rot, damping-off in seedlings and aerial blight of leaves (Table 1). Check the potting soil daily. There are 5 surprising facts here, including the new myth about safety concerns. Stem cankers cause defoliation and death of the distal plant parts. The holidays are here and the beautiful poinsettias are a very common flower for most house holds. In fact, bractsaccount for only 0.1 to0.5% of the total Ca2+ transported to the whole shoot and most of that is transported during the very early stages of growth. See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement. Diseases ofPoinsettias Stephen T. Nameth, OhioState University, DeptofPlant Pathology Successful poinsettia disease control/ management, or lack ofit, can mean the difference between a great crop andjoyous holiday season, and a terrible crop and "Bah, humbug." Apply a fungicide to protect plants. The recommended pH range in a soilless substrate is 5.8 to 6.5. Brown spots form on flower, leaf, or stem tissue. Downy Mildew of Coleus. We have described the major poinsettia diseases that are widespread in the industry. Powdery mildew is most often a problem under cooler grower conditions. Several diseases affect production of poinsettia, ... Powdery mildew is a fairly recent disease problem in poinsettia production that can develop explosively late in the crop production cycle. Poinsettias are also susceptible to Rhizopus soft rot (Rhizopus stolonifera). One of the most commonly asked questions we get is, “How do you take care of poinsettias?” The secret to keeping poinsettia plants healthy and happy is knowing what continued care they need long after the holidays end. The water needs of a poinsettia can be determined with your finger. Insecticides are not a good control option as they are not very effective. A number of other less common biotic and abiotic diseases can cause significant problems for individual growers when favorable environmental conditions prevail. Cuttings wilt and die rapidly. The fungus-like Pythium survives between crops in infected plant material from previous crops whether they are poinsettia or not. High substrate pH can induce nutrient problems in poinsettias. Longitudinal splits form at the stem base at and below soil line. Use only sterile soil and clean tools, and hang up hose ends. Maintain even soil moisture levels. Our environmental conditions create a truly unique set of problems that must be overcome to produce a high quality product. Avoid skin contact, as the sap can cause irritation in some people. Roots are rotted. Treat your poinsettia well throughout the holiday season. poinsettiicola occurs rarely but was a serious problem for poinsettia production in 2010. Several insects may attack poinsettias: white flies, fungus gnats, mealybugs and spider mites. The disease had probably gone unidentified for a number of years before plant pathologists were able to identify the pathogen. Although there are other species known to cause plant disease, not all species of Rhizoctonia are plant pathogens. Poinsettias with Pythium root rot are often stunted, wilted despite media wetness, and slightly chlorotic. Apply a fungicide to protect plants as soon as any mildew is found. Lower leaves yellow and fall. Houseplant Problems: Symptoms: Possible Causes: Control/Comments: Plant wilting: Overwatering or lack of water: overwatering can cause root rots. Favored by low light and low temperature in late fall, acidic potting mix, and exclusive use of ammonium nitrogen source. The disease causes a whitish, powdery discoloration of the upper and lowers surfaces of the leaves and colored bracts (Benson et al. Early in season, the rooted cuttings are stunted, yellow, and wilting. Several insects may attack poinsettias: white flies, fungus gnats, mealybugs and spider mites. Maintain low relative humidity in the crop canopy. The production time for an azalea crop, from propagation to flowering, could be as long as 3 years, so the price required to realize a profit is a handicap. Do not use ammonium nitrogen sources exclusively. Poinsettias (Euphorbia pulcherrima), so familiar during the winter as houseplants, grow as perennials in U.S. Department of Agriculture plant hardiness zones 9 through 11. View our privacy policy. Powdery mildew is a fairly recent disease problem in poinsettia production that can develop explosively late in the crop production cycle. Infected stems stretch several inches above the normal crop. In addition to biotic agents, improper fertilization practices can cause symptoms in poinsettias. Large roots and lower stem may be enlarged and ridged. Grafting Techniques for Greenhouse Tomatoes. Leaves yellow and fall. For growing plants, beautiful gardens and propagation, How to Make a Natural and Organic Insecticide for Aphids. Destroy infected plants and crop debris. The relative humidity within the plant canopy should be kept below 93percent throughout the production cycle. Apply a fungicide to protect plants. Symptoms Rhizoctonia grows along the upper surface of the growing medium, so it often attacks the plant stem at the soil line. Poinsettias: The problem children Heidi Wollaeger , Michigan State University Extension - October 24, 2013 Poinsettias are susceptible to diseases, distortion through rapidly changing environmental conditions, and uncommon nutrient deficiencies. Fungus gnats are small, dark-colored flies about 3 mm (1/8 inch) long. Sunken dark brown areas on stem may reach slightly above soil line. Each fungus can cause disease independently, or fungi may interact to produce rapid decline. Roots are brown and water soaked. Scout stock plants frequently and inspect cuttings as soon as they arrive. Symptoms . The combined use of slow-release and soluble fertilizer or soluble fertilizer use with no leaching favors this. Later, stunted plants defoliate, flower prematurely, and die. In addition to biotic agents, improper fertilization practices can cause symptoms in poinsettias. Pythium root and stem rot is a common disease problem in poinsettias, and is often difficult to control. Remove damaged tissues. Lower stems below ground may have a shredded appearance. Spray Options: Lewis Mites - Avid, Sirocco Spider Mites - Avid, Floramite, Sirocco Discard plants with symptoms. Apply a magnesium-containing fertilizer. When poinsettias get problems, they always seem to hit hard and fast. Poinsettias are extremely susceptible to root rot disease. Lower leaves yellow while leaf margins burn. When purchasing plants, carefully check for whiteflies and other insects. They can be stunning when they’re healthy, but a poinsettia with yellow leaves is both unhealthy and decidedly not festive. HOW TO COLLECT AND PREPARE TOMATO SEEDS FOR PROPAG... HOW TO COLLECT AND PREPARE PEAS FOR PROPAGATION. Several new … poinsettiicola occurs rarely but was a serious problem for poinsettia production in 2010. Stems often decay quickly, starting with the formation of brown to reddish brown lesions that enlarge, forming sunken cankers near the soil line … Destroy infected plants. By watching for potential problems, understanding their causes andknowing the proper corrective actions to take, one can avoid most of theseissues. If it is below 50°F or windy outside then put your plant inside a loose-fitting bag. Root and top growth is restricted. Williams says different root rot pathogens cause trouble depending on where you currently are in the production cycle. If you are having difficulty diagnosing a specific disease(s) we encourage you to contact the Texas Plant Disease … Bract edge burn may cause serious problems in the final weeks of production or following boxing and transport. Avoid damaging established, well-branched plants. so even a slightly low Ca2+ contents may cause problems. Poinsettias are extremely susceptible to root rot disease. Botrytis. Water should be able to drain from the bottom of containers. Poinsettias are subject to attack from insect pests and mites all season long, so effective management is a must for quality poinsettia production. Roots are dark brown and the outer layers of root tissue strip off leaving a bare strand of inner vascular tissue exposed. Poinsettias need bright, but filtered light, away from strong sun and draughts. Foliar Nematodes. Large, tan, sunken cankers may form onthe older stems, girdling the stem. Yellowing is followed by burning of lower leaf margins. It is a Gram-positive bacterium, very different from the Xanthomonas that causes angular leaf spots and the Dickeya and Pectobacterium species that cause cutting rots. Avoid root rots and over-fertilization. Use of molybdenum-containing fertilizer or a complete minor element supplement, or add sodium molybdate to soluble fertilizer. Xanthomonas campestris pv. It is often the cause of rot in cuttings, especially those under mist. Growing poinsettias in Texas is a challenge. Yellowing develops between the veins of mid and lower leaves. Do not over-fertilize. Poinsettia problems. Iron deficiency is the most common problem at substrate pHs above 6.5. Avoid purchasing insect-infested plants. Poinsettias are susceptible to a wide variety of diseases that attack the Leaf margins yellow and burn. Plants that are allowed to get too dry will wilt and also drop leaves. Small, light-colored, round spots with yellow halos form on the leaf, particularly along the main vein. However, eating the plant is NOT recommended. It is a Gram-positive bacterium, very different from the Xanthomonas that causes angular leaf spots and the Dickeya and Pectobacterium species that cause cutting rots. Some other diseases can be problematic to poinsettias at any phase of production. Severely damaged plants should be discarded. For example, 5 percent of a spray solution with Orthene or Talstar insecticide residues can cause a lot of problems with BCAs when the tank is filled up to 100 percent and other, noncompatible product is added. Lower leaf margins are cupped downward. Disease Symptoms Pathogen/Cause Management; Ammonium Toxicity: Root and top growth is restricted. The pots of most poinsettias are set inside decorative pot covers. Everything you need to know about poinsettias: rich red bracts, deep green leaves and clusters of tiny, bright yellow or white flowers. Early season production diseases can include Xanthomonas leaf spot and Alternaria leaf spot. Late in the season, roots turn black. Apply a fungicide to protect plants. Diseases of Poinsettias. They do, however, represent those diseases that Texas growers experience most frequently. Another culprit for problems on poinsettia is the fungal disease Botrytis, explains Mark Brotherton, portfolio leader at SePRO. Whiteflies continue to be the major insect pest problem for poinsettias. Downy Mildew of Basil. Things like whitefly, Lewis mite, root rots, and nutritional issues can all quickly derail a quality crop. In the garden, plants may grow to 4m tall and will need regular pruning to keep them within bounds. Defoliation and plant death follow. ... poinsettias can get fungal diseases and pests such as mealy bugs. They run the biggest risk of succumbing to pests or disease while growing in the greenhouse at the nursery. By far the most common problem with poinsettias is leaves shrivelling up and falling off. Space plants to provide good air circulation. In continuous feed programs, 10% of the soluble fertilizer applied should leach out the bottom or clear tap water should be applied every second or third watering. Figure 1: Root diseases commonly occur in poinsettias late in the season when it is easier to overwater due to colder temperatures, shorter day length and slow water uptake by the plant. Wounded stems of older plants develop soft rot and lodge. White fungal growth in patches is seen on leaves and bracts. Disease causes the foul odor. With proper care, poinsettias can last longer than the traditional holiday season, and the information found in this section will help with that. Poinsettias are very sensitive to cold temperatures and drafts. JavaScript seems to be disabled in your browser. Be nice to your plants! Fungicides do not make the white fungus go away after it is dead. Molybdenum deficiencies can cause distorted leaves due to the failure of the interveinal areas to expand normally. Lime to adjust the soil pH above 5.5. Caution. I have never known of poinsettias to give off any odor!! * For additional information, see section on Key Diseases. They're synonymous with Christmas, all around the world, and make fantastic festive decorations both inside and outside the home. The diseases listed in this table are not inclusive of all those that are known to occur on poinsettias. The star feature of poinsettias is the “flower” produced at the ends of branches. Phytophthora and Rhizoctonia can also rot the roots of poinsettias, and under favorable conditions, ... the cause of scab or spot anthracnose on both leaves and stems. Leaf damage consisting of malformation, yellowing and necrosis, observed in poinsettias was found to be caused by Mo deficiency. Miscellaneous diseases and disorders; Bleaching necrosis: Air pollutant injury from either chlorides (> 0.5 ppm), nitrogen dioxide (> 2-3 ppm) or sulfur dioxide (> 0.5 ppm) : Bract necrosis: Physiological disorder favored by high humidity, heavy watering and high (ammoniacal) … In addition to biotic agents, improper fertilization practices can cause symptoms in poinsettias. Root rot, over-fertilization, low light intensity, or lack of moisture. The disease had probably gone unidentified for a number of years before plant pathologists were able to identify the pathogen. ! Use of magnesium-containing limestone. Use pasteurized soil and clean pots and tools. Poinsettias don’t usually have insect or disease problems once they make it to your home, particularly if you are just keeping them for the holiday season. Webbing may also be present with heavy mite populations. Poinsettias: The problem children Heidi Wollaeger , Michigan State University Extension - October 24, 2013 Poinsettias are susceptible to diseases, distortion through rapidly changing environmental conditions, and uncommon nutrient deficiencies. • Crud (physiological disorder): Dried drops of plant sap (latex) occurring in the bracts may interfere with normal bract development and cause disfigurement of the flower head. Cause: This is a very common greenhouse pest easily be transferred from the grower, to the retailer, and eventually to your home. Avoid damaging plants. Hey, it's the holiday season! Get notified when we have news, courses, or events of interest to you. Poinsettias are famous for their flower-like bracts that turn bright red in the winter time and earn them a place as an extremely popular Christmas plant. Large, light brown to tan, slightly sunken cankers form on older stems especially near large branches or crotches. Symptoms vary with the pathogen. Warning Keep children and pets away from poinsettias because the sap can irritate skin and eating it may cause vomiting or other stomach problems. Apply a fungicide to protect plants. Lack of molybdenum or acidic pH potting mixes (pH 4.5; 5.5 on some cultivars). Poinsettia problems. Botrytis may also cause stem blight (Figure 9) on cuttings and plants, often at branch crotches. When the soil becomes dry to the touch, water the plant until water begins to flow out the bottom of the pot. Mechanically transmitted. disease. Informational table showing disease name, symptoms, pathogen/cause, and management of Poinsettia diseases. High substrate pH can induce nutrient problems in poinsettias. Promptly remove fading flowers an… Heat and vent to reduce humidity. Treat your poinsettia well throughout the holiday season. Fuchsia Rust. Defoliation and death of branches occur above cankers that girdle stems. HOW TO COLLECT AND PREPARE FRENCH AND RUNNER BEAN... HOW TO COLLECT AND PREPARE LETTUCE SEEDS FOR PROPA... HOW TO COLLECT AND PREPARE MELON AND CUCUMBER SEE... HOW TO COLLECT AND PREPARE SWEET AND CHILLI PEPPER... HOW TO CHOOSE PLANTS FOR HOT, DRY BORDERS, THE HISTORY OF THE JACK 'O' LANTERN HALLOWEEN PUMPKIN, WHAT CAUSES POND WATER PROBLEMS AND HOW TO AVOID THEM, HOW TO MAINTAIN AND LOOK AFTER A HEALTHY POND. Fungal Diseases of Poinsettias. If these practices are followed, then fungicides can help in management. MED Whitefly). Use a well-drained, soilless potting media labeled for houseplants. DISEASES Botrytis Optimizing the growing environment is still one of the best methods to limit Botrytis in your greenhouse. Do not combine the use of slow-release and soluble fertilizers. Over the last 10 years, it has become evident that BEB is cultivar-dependent. Disinfest tools. Managing Pests and Disease. They are often thought to be poisonous but research shows that poinsettias contain no chemicals commonly considered toxic. These popular Christmas plants contain a compound similar to that found in rubber latex -- and can cause … Be nice to your plants! Diseases of Poinsettias. Keep hose ends off the ground. Downy Mildew of Impatiens. Although there are a number of things that can go wrong from now until December 25, there … Whiteflies on poinsettias and other indoor plants are extremely difficult to control. When cooling your greenhouses as the poinsettias mature, avoid night temperatures below 60 F. Ventilate as much as possible during the day and water when foliage will be dry before night. Poinsettias: Disease Prevention and Control. Poinsettias with Pythium root rot are often stunted, wilted despite media wetness, and slightly chlorotic. While there are numerous Pythium species that infect a wide variety of greenhouse ornamentals, Pythium aphanidermatum is the most common pathogen found on poinsettias in late summer and fall. If you have a latex allergy, be careful around poinsettia plants. WHICH NATIVE ANIMALS EAT SLUGS AND SNAILS. This is why scouting might be more important in this crop than any other.. Here’s a month by month guide on what you should be looking for to prevent small problems from becoming big issues. Cuttings develop a soft rot at the base which moves upward quickly and kills the cutting. Control must prevent disease before bracts form. The disease started on infected cuttings and … (Gray Mold)quickly colonizes damaged or senescing plant tissuesand initially appears as brown spots on the leaves and flower bracts. Apply a fungicide to protect plants at planting. Plant wilt. Apply a fungicide to protect plants. Poinsettias (Euphorbia pulcherrima) are susceptible to a variety of issues when produced in a greenhouse.It is imperative for growers to monitor their crops carefully to avoid such problems. Disease problems caused by fungi and nematodes resulted in serious crop losses until better control measures were achieved. Bract Edge Burn became a major problem in the late 1970s with the introduction of Gutbier V-14 Glory produced in southern climates. poinsettias in recent years. This is why scouting might be more important in this crop than any other.. Here’s a month by month guide on what you should be looking for to prevent small problems from becoming big issues. Use only sterile soil and clean tools, and hang us hose ends. WHY IS MY POINSETTIA DROPPING ITS LEAVES? Xanthomonas campestris pv. Avoid overhead irrigation. A number of other less common biotic and abiotic diseases can cause significant problems for individual growers when favorable environmental conditions prevail. Avoid skin contact, as the sap can cause irritation in some people. In Hawai‘i, the disease tends problems, as well as the cooler temperatures needed for finishing. Proximity to the plant itself can cause wheezing, rhinitis, asthma, and other symptoms in individuals with a latex allergy. Keep hose ends off the ground. ... faced with a problem on Holy Night: she lacked the means to contribute a gift in the Christ Child ceremony at … Apply a fungicide to protect plants. Healthy roots should be light-colored and firm. They need a minimum temperature of 13-15°C (55-59°F). Later in the season, plants defoliate and flower prematurely. Early season production diseases can include Xanthomonas leaf spot and Alternaria leaf spot. Largenumbers of gray to olivaceous green spores are produced on the infectedtissues. The recommended pH range in a soilless substrate is 5.8 to 6.5. Iron deficiency is the most common problem … Prevention is the best management strategy. Additionally, growers need to account for whitefly biotypes that have developed over the last decade or have the potential to develop insecticide resistance (i.e. A number of other less common diseases can cause significant problems for individual growers when favorable environmental conditions prevail. Carefully inspect poinsettias and any other plants before you buy them or bring them into your home to avoid introducing pests or diseases. By entering your email, you consent to receive communications from Penn State Extension. Herb Bedding Plants: Pest Management for Herb Bedding Plants Grown in the Greenhouse . Hey, it's the holiday season! In the garden, plants may grow to 4m tall and will need regular pruning to keep them within bounds. The pathogen is restricted to poinsettia, however, and does not infect other plant species. Discard infected cuttings and infested media. They need a minimum temperature of 13-15°C (55-59°F). There are also many dwarf varieties available that grow to only 1–2m. This fungal pathogen thrives under cool temperatures around 68-77°F. Pythium is usually most serious in early stages of poinsettia production when infected cuttings can wilt and die after transplanting. They can be found either on the plant or soil surface. As the top-selling potted plant in the United States, the poinsettia (Euphorbia pulcherrima) is historically rooted in the political world. Things like whitefly, Lewis mite, root rots, and nutritional issues can all quickly derail a quality crop. A major limiting factor in the production of a timely and healthy poinsettia …