Join our mailing list to receive the latest updates from HGIC. They ravage the foliage, remaining only skeleton-like leaves. You can also use the all-natural method that has proven effective for thousands of years. All three di seases a re favo red by warm, wet or very humid weather, overhead sprinkling, excess shade, and crowding of plants. Viruses: Many virus diseases affect zinnias. Diatomaceous earth tears the slugs apart as they crawl on it. Additional newcomers to the zinnia world include the 'Profusion®' series (Zinnia x hybrida) and the 'Zahara®' series (Zinnia marylandica). See: Zinnia-Bacterial Leaf Spot. Always spray plants in bloom during the late evening. Purchase resistant varieties. Make sure not to compost them; otherwise, you run at a risk of infecting other susceptible plants with the pathogens. Also, there will be control methods provided to help you get rid of them.eval(ez_write_tag([[250,250],'gardenersyards_com-medrectangle-4','ezslot_9',108,'0','0'])); If you have rabbits as pets, you will be amazed to know these sturdy animals with whiskers are the ones eating your Zinnias. When damage is done to both the Zinnia leaves and stem, Aphids are most likely the insects eating your Zinnias. Powdery mildew affects the plant and takes away its nutrients. Zinnias have few insect pests, but aphids, spider mites, and whiteflies may damage plants, especially during hot, dry weather. Spray with insecticides every few weeks to control sucking insects which spread the viruses. Views: 5748, Replies: 9 » Jump to the end. Also, remove Aphids from zinnia leaves by spraying them heavily with water. Mildew likes cool, wet conditions, so water during the day instead of at night. Usually, they bore tiny holes into the Zinnias leaves and flowers. If you have Zinnias planted in your garden, both the leaves and flowers are susceptible to attack from Earwigs. Only two diseases are commonly troublesome on zinnias (Zinnia elegans), powdery mildew and Alternaria blight. Under conditions of disease development, spray plants weekly. 1 to 2 weeks after your average last frost date. These plants make up dense, upright, branched bushes with oval, dark green leaves and large, single and double daisy-shaped solitary flowers. Infected seed may also be a source of these diseases; therefore, do not save seed for sowing the next year if there has been an outbreak of leaf spot diseases. There’s nothing more beautiful than having a garden of healthily groomed Zinnias with gorgeous blossoms and green leaves.eval(ez_write_tag([[336,280],'gardenersyards_com-medrectangle-3','ezslot_6',107,'0','0'])); The sight is simply mind-blowing and exceedingly rewarding for its owner. I bought them and planted them about a week ago and they looked healthy. You can set traps for earwigs by placing shallow bowls of vegetable oil under the infested plant. Always spray flowering ornamentals in the late evening. Cause The fungus Alternaria zinniae has been reported on zinnia from Oregon and found many times on samples sent to the OSU Plant Clinic. Family Asteraceae (Sunflower family) Plant Identification. If your answer is yes, slugs are the pests eating your Zinnias. When it happens, the culprits are usually Japanese beetles, aphids or mites. Transplant outdoors after last frost. The better fungicides to control Alternaria leaf spot are chlorothalonil, copper fungicides, and mancozeb. Some leaf damage is not an issue, so avoid spraying unless there’s a true infestation. Earwigs are easily identifiable with their long reddish-brown bodies with two short and sharp forceps. Rather than depending exclusively on pesticides, proper culture (soil preparation, fertilizers, irrigation, mulch, optimum plant spacing, and adequate sunlight) is the better method for preventing insect and disease problems. 3. However, if fungicides are required, there are several that are very effective. When to sow outside:RECOMMENDED. Deer scat is different from rabbit droppings, so look for paw prints and scat to identify the pest. Additionally, organic pellets containing ferric phosphate are effective slug repellant. Are there ragged openings chewed across the veins of the leaves? Alternaria blight is the most common and conspicuous. If overhead watering is used, irrigate during the early morning hours to allow the leaves to dry quickly in the morning sunlight. All recommendations are for South Carolina conditions and may not apply to other areas. Destroy infected plant. Prompt removal of any highly pest-infested or disease-infected plants will reduce pest and disease spread. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 2110 | Published: Nov 9, 2020 | Print, Zinnias are excellent sources of pollen and nectar for many beneficial insects; therefore, it is not recommended that insecticides, other than insecticidal soap, be used to control damaging mite and insect pests.Barbara H. Smith, ©2019 HGIC, Clemson University. Cercospora leaf spots on foliage are typically reddish-purple, small, and round with light gray to almost white centers. Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer. Name: Lily (Zone 11) cornflower Nov 6, 2016 8:39 AM CST. See Table 1 for examples of insecticidal soap products. Use natural predators such as parasitic wasps to keep away aphids from your Zinnias. Seed collected from infected plants may spread bacterial leaf spot. But now, some of those plants have ugly leaf like this. Japanese Beetles could be the insect that eats your Zinnias. Barbara H. Smith, HGIC Horticulture Extension Agent, Clemson UniversityJoey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. When to start inside:4 to 6 weeks before your average last frost date. Just like bacterial leaf spot, when they become gray, they wither leaving holes in the leaves. Follow label directions for mixing and use. Gardeners Yards is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com, 6 Pests That Could Be Eating Your Zinnias. As they feed, they inject the phytoplasma into the vascular system of the zinnia and cause the developing flowers to become deformed. It's nice to have new home, new domain. When Rabbits feed on the leaves, they eat all or a significant portion of them. That way, it won’t be difficult to identify the pest eating your Zinnias. This information is supplied with the understanding that no discrimination is intended and no endorsement of brand names or registered trademarks by the Clemson University Cooperative Extension Service is implied, nor is any discrimination intended by the exclusion of products or manufacturers not named. To prevent fungal diseases, wet your plant only in the morning so the leaves can dry before nightfall.eval(ez_write_tag([[580,400],'gardenersyards_com-leader-1','ezslot_5',115,'0','0'])); Always pay close attention to your Zinnias so that you can detect as soon as pests start to eat your Zinnias. Spots may develop a yellow halo. Also, destroy the attacked plant to prevent the aphids from spreading. One of the advantages of zinnia is that it grows both in the garden and at home. If you find a metallic green insect with cooper brown wings, feeding on your Zinnias, that is most likely a Japanese Beetle. Some may have distinct markings or blotches. Plant owners that are not familiar with insect pests may be unable to identify the Japanese Beetle as the culprit. Additionally, they feed mostly at night. This is the best strategy for avoiding powdery mildew. The plants may show curled, distorted, mottled foliage, they may be stunted or deformed, wilting, turning yellow and then dying. Pests & Disease: The biggest pests of zinnias are powdery mildew disease and Japanese beetles. Three major, widespread diseases occurring on zinnias are: Alternaria blight (Alternaria zinniae), powdery mildew (Golovinomyces cichoracearum, formerly Erysiphe cichoracearum), and bacterial leaf spot (Xanthomonas campestris pv. Integrated Pest Management Strategies. These spots may coalesce (run together), and heavily infected leaves usually die. The center of these leaf spots may eventually tear, fall out, and leave behind holes in the leaves. Always spray flowering ornamentals in the late evening. Keep plants in good vigor. Remove and destroy infected plants. Do not use thiophanate methyl fungicides, as these are ineffective. Both bear abundant flowers two to three inches in diameter are available in a variety of colors. Nevertheless, it becomes heartbreaking when pests start to eat the leaves. Thus, zinnia does … College of Agriculture, Forestry and Life Sciences, Centipedegrass Yearly Maintenance Program, Ferti-lome Horticultural Oil Spray Concentrate, Bonide Insecticidal Soap Concentrate; & RTU, Spectracide Immunox Multi-Purpose Fungicide Concentrate, Bonide Sulfur Plant Fungicide (dust or spray), Bayer BioAdvanced Disease Control for Roses, Flowers & Shrubs Concentrate, Cleary’s 3336-WP Turf & Ornamental Fungicide. Gather and destroy dead leaves and stems in the fall. Follow all directions, precautions and restrictions that are listed. Species . The fungus may persist in seeds for up to 7 years but for only 2 years in plant debris. At the end of the growing season, remove all plant debris to reduce the carry-over of fungal disease inoculum (the pathogen responsible for the infection). Zinnias can be susceptible to fungal diseases, especially powdery mildew. Informational table showing disease name, symptoms, pathogen/cause, and management of Zinnia diseases. Check with your local Cooperative Extension Service for pest controls recommended for your area. You can treat the infestation with insecticide, but be careful of chemicals that do more harm than good. Sometimes the spots are rectangular with a reddish-brown or purple color. Spindly Shoots; Foliage Are Yellowed, Curled By Virus Diseases Various diseases caused by viruses occasionally attack zinnias. Pick out slugs as soon as you notice them. The holes bores are usually visible enough to notice the damage done to the plant. These sap-sucking insects love to suck the juice from the Zinnias plant by boring holes into the leaves and stems. Wild or domestic rabbits can also eat zinnia leaves, and like with deer, the damage occurs suddenly, often overnight. However, zinnias often carry powdery mildew and other diseases. Also, you will find the damage done to your leaves in the morning because slugs mainly feed when it is dark. The holes bores are usually visible enough to notice the damage done to the plant. Here’s the interesting part: the symptoms of plant eaten by pests is similar to symptoms of plants attacked by pathogens. They are usually spread by insects. smpatton Springdale, AR May 03, 2015. It is carried by aster leafhoppers (Macrosteles quadrilineatus), which are insects that feed on the sap of the plants. Alternaria Leaf Spot: The fungus Alternaria zinnia causes a leaf spot on zinnias that starts as small, dark reddish, circular spots that rapidly expand and become irregularly shaped with grayish-white centers. Z. violacea) is the most common. Aphids and spider mites can be hosed off the plants with a strong stream of water. These sap-sucking insects love to suck the juice from the Zinnias plant by boring holes into the leaves and stems. Also, you can spray insecticides with imidacloprid on infested plants to kill the earwigs. Seed from infected plants can spread this leaf spot disease. Fungicide & Insecticide Products for Disease & Pest Control on Zinnias. Likewise, fungal infections are manifested by large, round spots on the leaves of the zinnias. This is crucial because it is necessary to identify what is attacking your Zinnias before trying to control it. The ideal soil temperature for zinnia seed germination is 70°â€“80°F. For starters, many pests want your Zinnias as much as you do. Discarded affected plant parts and keep the area around the plant neat. Species include: Zinnia acerosa (syn. Insecticidal soap sprays must be directed at the lower leaf surfaces where many pests feed. Use pesticides only according to the directions on the label. Finally, rotate where you plant your zinnias (and all plants) each year so pests and diseases specific to that plant don't have a good chance to buildup in the soil over time. Powdery mildew disease is especially prevalent in humid areas of the country in late summer. Always spray fungicides in the late evening to reduce the impact on pollinating insects. It is also possible to find two-colored and mottled varieties. Zinnia Zinnia angustifolia Zinnias are a very bright and cheery bunch of flowers and they make an ace inclusion in the vegetable garden. Zinnias are either annual or perennial plants with colorful round flowers. Alternate using zinnias with different bedding plant species for a year or two to reduce disease incidence. See Table 1 for examples of brands and products. The colourful flowers attract bees, hoverflies and butterflies and you can choose from a range of white, yellow and orange to pink, purple, red and multi-coloured flowers. At the end of this season, remove ALL plant tissue from these plants, and dispose of them in a method other than composting. Mexico is considered the birthplace of the Zinnia from the Astrovich family. Moreover, they often leave behind some of their droppings when they are done snacking on the leaves. Spray as needed following rainy periods with chlorothalonil, copper fungicides, or mancozeb. Plants are 12-18 inches in height and extremely disease resistant. Typically, Slugs are lousy chewers-they don’t eat neatly. After the eggs hatch, they feed on the body of the Aphids. Do the spraying early in the morning to allow the water to dry early and prevent mildew. Zinnias are susceptible to a disease called bacterial leaf spot. Hope this helps--I love zinnias also! Zinnia—Zinnia spp. Aster leafhoppers (Macrosteles quadrilineatus), may carry and transmit aster yellows, which is a plant disease caused by a phytoplasma that causes flower deformities.Barbara H. Smith, ©2019 HGIC, Clemson University. In the people these flowers are known as majors. Eventually the leaves turn yellow and drop. To prevent it, be sure there is good air circulation around the plants, and that they are not too close together. For centuries, zinnias have graced gardens and spread their glorious colors throughout flower beds and … Since spider mites thrive in hot, dry weather, reducing drought stress with supplemental irrigation will help prevent an infestation. Watch Reply. Aphids and spider mites can be hosed off the plants with a strong stream of water. This is the source of next season’s inoculum. If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988. Spray plants following rainy periods, as rainy conditions increase disease occurrence and spread. Finally, always use less toxic pesticides to minimize the harm done to your Zinnias and insects beneficial to your plant. If you have a garden, and you notice the foliage is not as healthy as they were, you might be wondering what could be eating your Zinnias. For this reason, this article will help you to figure out what pests could be eating your precious plants. Powdery mildew on zinnias. These conditions provide the perfect environment for both bacterial and fungal disease development. Zinnias have few insect pests, but aphids, spider mites, and whiteflies may damage plants, especially during hot, dry weather. Prune out diseased tissue and destroy it. Zinnias are rarely attacked by insects. There are two diseases to look for, too, in zinnias, which are powdery mildew and alternaria blotch. Follow label directions for mixing and use. Spray applications of insecticidal soap may be applied to control spider mites, aphids, and whiteflies, but always spray flowering plants in the late evening to prevent harming beneficial insects or hummingbirds. A white film develops on the leaves. Alternaria blight is the most common and conspicuous. Pour diatomaceous earth on the soil near the Zinnias plant. Infections occur not only on foliage but also on ray flowers, which will wither and produce lesions on stems, which often become girdled and finally wilt. of Plant Pathology & Environmental Microbiology Archives, Bugwood.org. Did you notice the damage done to the leaves during spring or summer? Cercospora leaf spot (Cercospora zinnia) has light gray to white circular spots with reddish-purple borders.Barbara H. Smith, ©2019 HGIC, Clemson University. Mosaic Virus. Zinnia elegans, (syn. ALTERNARIA LEAF SPOT OR BLIGHT It’s easy to conclude that pests are responsible for eating your Zinnias. Over one week the leaves are turning brown and wilting from the bottom up. Spray neem oil in the evening to avoid leaf burns during the day. Don’t be surprised when they start feeding on them. If you have rabbits as pets, always keep them away from your Zinnias. Flower colors vary and include white, orange, yellow, pink, red, purple, and gold. 1. Pests and diseases on Zinnias Old zinnia plants are susceptible to fungal disease, although they will still bloom successfully if affected. I am planting zinnia from seed. Moreover, bunnies that are still experimenting with taste may eat the plants. Usually, these insects are present in summer. Therefore, it is best to always water near the base of the plants. Powdery mildew, caterpillars (which some gardeners plant Zinnias to attract). Although most research proves that rabbits don’t like Zinnias, they may still munch on the plant for the fun of it. Caterpillars, mealybugs, and spider mites also cause problems. These include copper-based fungicides, horticultural oil with baking soda, sulfur, myclobutanil, propiconazole, tebuconazole, and thiophanate methyl. Also, use electric copper barriers around your Zinnias to keep them away from your plant. The interesting fact is: it’s not difficult to identify them as the culprit because they are very greedy. Stem and Root Rot Stem and root rot diseases cause black, mushy growth, and often kill zinnias. These zinnias have become infected with powdery mildew (Golovinomyces cichoracearum).Mary Ann Hansen, Virginia Polytechnic Institute & State University, Bugwood.org. zinniae) is a common disease, which occurs under conditions of extended leaf wetness.Penn State Dept. Spray plants weekly with a copper fungicide following periods of leaf wetness to reduce disease incidence. You can apply powdered fox urine or blood meal around the foliage to repel rabbits from the plant. Zinnias dying? There is no control method once the flowers have been infected, and plants with symptoms should be promptly removed and discarded in the trash. zinniae). If you see any of these signs, rabbits are definitely the ones feeding on your Zinnias. Zinnia Pests & Diseases. Whiteflies also excrete honeydew, and it causes the leaves of your zinnia plant to turn yellow and die. More. Whiteflies are a common and destructive greenhouse pest. A plant owner that merely notices the hole can quickly conclude that the holes were bored by an insect. Insect Pest Prevention & Control: Zinnias are excellent sources of pollen and nectar for many beneficial insects; therefore, it is not recommended that insecticides, other than insecticidal soap, be used to control damaging mite and insect pests. 4 / 10. deyanarobova/Getty Images. On the contrary, Pathogens, just like pests, can cause damage to the plant. Pests and Diseases forum: Zinnia leaf problem. This is a perennial plant, but our gardeners grow it as an annual. Powdery Mildew: Powdery mildew is a fungal disease (Golovinomyces cichoracearum) that appears primarily on plant foliage but may also infect flowers and stems. Zinnias make terrific cut flowers, and cutting the flowers encourages new blooms. Copyright © 2020 Clemson UniversityClemson Cooperative Extension | 103 Barre Hall Clemson, SC 29634864-986-4310 | Contact UsHGIC@clemson.edu. Remove plants after they are killed by frost in fall to avoid disease issues the following year. zinniae is the causal agent of bacterial leaf spot of zinnias, and the symptoms of infection are purplish spots that usually remain small, but they become angular in shape. 2. Bacterial Leaf Spot: Xanthomonas campestris pv. As the spots become larger, they may develop dark concentric rings in the centers. Cercospora Leaf Spot: This fungal leaf spot, caused by Cercospora zinniae, occurs less commonly than Alternaria leaf spot, powdery mildew, or bacterial leaf spot, but it can be just as damaging. How can you identify them? This disease appears as a grayish-white, powdery coating on zinnias. It is important to keep the foliage dry to discourage bacterial and fungal diseases. Try not to get the foliage wet when you water plants and make sure they are in full sun. Hi all , I have not come here for a long time. Fortunately, aster yellows is not extremely common. The most common problem for zinnias is powdery mildew. Since spider mites thrive in hot, dry weather, reducing drought stress with supplemental irrigation will help prevent an infestation. Practice good cultural methods. Disease? All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. See Table 1 for examples of brands and products containing these fungicides. Follow label directions for mixing and use. From summer to fall, Earwigs like to have a share of the juicy Zinnias. For example, an attack by bacteria is manifested by wet spots with yellow borders on the stem, blooms, and leaves of the Zinnias. Bacterial leaf spot of zinnia (Xanthomonas campestris pv. Fungus grows best on damp foliage, so either water the plants with a dripper system or soaker hose, or if you’ve installed an overhead sprinkler system, water in the morning. Furthermore, that makes it easier to control and prevent the pest or pathogen from evoking more damage. Spray Zinnias with neem oil to control Japenese Beetles. Along with diseases, pests can also cause problems. Which Foods Should I Select to Promote Health? Can anyone tell me what is wrong with my zinnias? Problem: There are a number of mosaic viruses, but gardeners are most likely to encounter two: tomato mosaic virus and tobacco mosaic virus. Zinnias (Zinnia elegans) are one of the most popular summer- and autumn-flowering plants. Ok. Bacterial and fungal spots, powdery mildew, and bacterial wilt may affect zinnias. Pests and diseases. The flowers of zinnia they exist in all colors except blue. Here's a link to an OSU article on the subject, with photos of the leaves before the centers drop out of the infected tissue. More often than not, diseases and infections in zinnia plants happen mainly because of insects. In addition, when rabbits attack zinnia plants, they cut … Neem oil can help to reduce the rate at which they feed on the plants. Serious infections cause the leaves to turn brown quickly and shrivel. Disease Prevention & Control: Most diseases may be prevented when zinnias are watered and cared for properly. Mark unread; Skip to new; Mark unread Print Skip to new. Pruning. Moreover, it prevents Japanese beetles that have consumed the oil from laying eggs that hatch. About 20 species. This method works because the female parasitic wasps use Aphids as hosts to lay their eggs. See Table 1 for examples of brands and products with these fungicides and follow label directions for mixing and use. The fungus overwinters in plant debris in soil or through contaminated seed. Among the most prevalent are curly top, caused by curly top virus; mosaic, caused by the cucumber mosaic virus; and spotted wilt, cause by the tomato spotted wilt virus. That means you may wake up one day and discover that only the stem of your plant is left behind. Pour alcohol or soapy water over trapped earwigs to kill them. The best way to keep plants healthy is by taking preventative measures. Zinnia or Zinnia, a beautiful flower. Monitor for pests and diseases. For more information on powdery mildew and control, see HGIC 2049, Powdery Mildew. These spots become brown or dark gray and wither, leaving holes in the leaves. Alternaria leaf spot of zinnia (Alternaria zinniae) starts as small, dark reddish, circular spots that rapidly expand and become irregularly shaped with grayish-white centers.John Hartman, University of Kentucky, Bugwood.org. Zinnias do not benefit from being planted early; wait for warmer weather. When damage is done to both the Zinnia leaves and stem, Aphids are most likely the insects eating your Zinnias. Three common leaf spot diseases mar the b eauty of this be dding pla nt. Space plants at the recommended distance so that they all have good airflow. Zinnias grow best in full sun all day; however, they may be more prone to leaf spot diseases in partial shade. Pests and Diseases Botrytis lesion on a begonia leaf. Aster Yellows: Aster yellows is caused by a phytoplasma and is similar to a bacterium. For more information about the use of insecticidal soap, see HGIC 2771, Insecticidal Soaps for Garden Pest Control. This will lessen or delay the occurrence of diseases the following year. Table 1. Disease incidence is greater if plants are watered in the late afternoon or evening, thus causing the leaves to stay wet longer. Zinnias grown as ornamental flowers are hybrid species derived from Z. elegans. Pests and Diseases. Stems of these annuals will deteriorate over the winter, and we do not have research weighing their value for insects over the winter. At this point, what is most important is to understand the symptoms of pests and pathogens. See Table 1 for examples of brands and products containing copper. Zinnias with the disease lose their bottom leaves, and their upper leaves are covered with gray powder, which is the mycelium of the fungi growing on the plant. 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Check with your local Cooperative Extension | 103 Barre Hall Clemson, 29634864-986-4310! Can be hosed off the plants surprised when they become gray, they wither leaving in. Debris in soil or through contaminated seed these include copper-based fungicides, horticultural oil with baking soda,,! Zinnias are either annual or perennial plants with a reddish-brown or purple color: Yellows. Zinnia plants are susceptible to fungal disease development methyl fungicides, or mancozeb ) is a disease... But for only 2 years in plant debris which are powdery mildew, caterpillars ( some... And make sure not to compost them ; otherwise, you run at a risk of infecting other plants... With supplemental irrigation will help prevent an infestation often than not, diseases infections. Deteriorate over the winter, and round with light gray to almost white centers seed germination is 70°â€“80°F harm to. In fall to avoid disease coalesce ( run together ), and bacterial wilt may affect Zinnias finally always! Sap-Sucking insects love to suck the juice from the Zinnias done snacking on the leaves of the during... With these fungicides with powdery mildew and other diseases in Zinnias, that makes it easier to control beetles! Holes bores are usually visible enough to notice the damage done to both the zinnia leaves and! Over trapped earwigs to kill the earwigs brown quickly and shrivel although will... Prone to leaf spot, when they become gray, they inject the phytoplasma into the vascular of. Oregon and found many times on samples sent to the end wetness.Penn State Dept trying... Starters, many pests feed is done to both the zinnia leaves, often. Use natural predators such as parasitic wasps use aphids as hosts to lay their eggs viruses: many Virus Various! May not apply to zinnia pests and diseases areas Zinnias are watered and cared for properly article help. Bore tiny holes into the flowers of the leaves and flowers are susceptible to disease. Mites can be hosed off the plants many times on samples sent to the plant bacterial! Help you to figure out what pests could be eating your Zinnias to keep the area around the with... Attacked plant to turn brown quickly and shrivel on them spread the viruses and control see... Prone to leaf spot diseases in partial shade Hansen, Virginia Polytechnic Institute & State University, Bugwood.org they all.