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For more information about the use of insecticidal soap, see HGIC 2771, Insecticidal Soaps for Garden Pest Control. Follow label directions for mixing and use. Zinnia—Zinnia spp. 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. If you find a metallic green insect with cooper brown wings, feeding on your Zinnias, that is most likely a Japanese Beetle. Moreover, they often leave behind some of their droppings when they are done snacking on the leaves. Pests and diseases on Zinnias Old zinnia plants are susceptible to fungal disease, although they will still bloom successfully if affected. The center of these leaf spots may eventually tear, fall out, and leave behind holes in the leaves. Watch Reply. This is crucial because it is necessary to identify what is attacking your Zinnias before trying to control it. Gather and destroy dead leaves and stems in the fall. These sap-sucking insects love to suck the juice from the Zinnias plant by boring holes into the leaves and stems. These spots become brown or dark gray and wither, leaving holes in the leaves. Z. violacea) is the most common. As they feed, they inject the phytoplasma into the vascular system of the zinnia and cause the developing flowers to become deformed. You can treat the infestation with insecticide, but be careful of chemicals that do more harm than good. Nevertheless, it becomes heartbreaking when pests start to eat the leaves. Hi all , I have not come here for a long time. It is also possible to find two-colored and mottled varieties. Zinnias make terrific cut flowers, and cutting the flowers encourages new blooms. Minimize wetting of foliage and space plants properly to avoid disease. 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. Pour diatomaceous earth on the soil near the Zinnias 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. Join our mailing list to receive the latest updates from HGIC. Spray Zinnias with neem oil to control Japenese Beetles. 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. Zinnias have few insect pests, but aphids, spider mites, and whiteflies may damage plants, especially during hot, dry weather. Zinnias are either annual or perennial plants with colorful round flowers. Deer scat is different from rabbit droppings, so look for paw prints and scat to identify the pest. Family Asteraceae (Sunflower family) Plant Identification. Powdery mildew disease is especially prevalent in humid areas of the country in late summer. Ok. 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. Thus, zinnia does … Aphids and spider mites can be hosed off the plants with a strong stream of water. Although most research proves that rabbits don’t like Zinnias, they may still munch on the plant for the fun of it. Spray as needed following rainy periods with chlorothalonil, copper fungicides, or mancozeb. Alternate using zinnias with different bedding plant species for a year or two to reduce disease incidence. Three common leaf spot diseases mar the b eauty of this be dding pla nt. That way, it won’t be difficult to identify the pest eating your Zinnias. To prevent it, be sure there is good air circulation around the plants, and that they are not too close together. There is no control method once the flowers have been infected, and plants with symptoms should be promptly removed and discarded in the trash. Informational table showing disease name, symptoms, pathogen/cause, and management of Zinnia diseases. Try not to get the foliage wet when you water plants and make sure they are in full sun. Flower colors vary and include white, orange, yellow, pink, red, purple, and gold. Additional newcomers to the zinnia world include the 'Profusion®' series (Zinnia x hybrida) and the 'Zahara®' series (Zinnia marylandica). This is the best strategy for avoiding powdery mildew. Additionally, they feed mostly at night. It is important to keep the foliage dry to discourage bacterial and fungal diseases. 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. If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988. Zinnia or Zinnia, a beautiful flower. I bought them and planted them about a week ago and they looked healthy. Fungicide & Insecticide Products for Disease & Pest Control on Zinnias. 1 to 2 weeks after your average last frost date. For this reason, this article will help you to figure out what pests could be eating your precious plants. Likewise, fungal infections are manifested by large, round spots on the leaves of the zinnias. If you see any of these signs, rabbits are definitely the ones feeding on your Zinnias. Seed from infected plants can spread this leaf spot disease. Prompt removal of any highly pest-infested or disease-infected plants will reduce pest and disease spread. The plants may show curled, distorted, mottled foliage, they may be stunted or deformed, wilting, turning yellow and then dying. Whiteflies also excrete honeydew, and it causes the leaves of your zinnia plant to turn yellow and die. Zinnias grow best in full sun all day; however, they may be more prone to leaf spot diseases in partial shade. Bacterial and fungal spots, powdery mildew, and bacterial wilt may affect zinnias. These plants make up dense, upright, branched bushes with oval, dark green leaves and large, single and double daisy-shaped solitary flowers. 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. zinniae) is a common disease, which occurs under conditions of extended leaf wetness.Penn State Dept. See Table 1 for examples of insecticidal soap products. It's nice to have new home, new domain. In the people these flowers are known as majors. Moreover, it prevents Japanese beetles that have consumed the oil from laying eggs that hatch. 1. This is the source of next season’s inoculum. Japanese Beetles could be the insect that eats your Zinnias. Earwigs are easily identifiable with their long reddish-brown bodies with two short and sharp forceps. Moreover, they often bore holes into the flowers of the Zinnias. Don’t be surprised when they start feeding on them. 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. Hope this helps--I love zinnias also! If overhead watering is used, irrigate during the early morning hours to allow the leaves to dry quickly in the morning sunlight. Which Foods Should I Select to Promote Health? On the contrary, Pathogens, just like pests, can cause damage to the plant. The flowers of zinnia they exist in all colors except blue. More often than not, diseases and infections in zinnia plants happen mainly because of insects. Wild or domestic rabbits can also eat zinnia leaves, and like with deer, the damage occurs suddenly, often overnight. 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. Views: 5748, Replies: 9 » Jump to the end. Mark unread; Skip to new; Mark unread Print Skip to new. Problem: There are a number of mosaic viruses, but gardeners are most likely to encounter two: tomato mosaic virus and tobacco mosaic virus. Discarded affected plant parts and keep the area around the plant neat. All three di seases a re favo red by warm, wet or very humid weather, overhead sprinkling, excess shade, and crowding of plants. Practice good cultural methods. Spray plants weekly with a copper fungicide following periods of leaf wetness to reduce disease incidence. Whiteflies are a common and destructive greenhouse pest. Also, you will find the damage done to your leaves in the morning because slugs mainly feed when it is dark. However, if fungicides are required, there are several that are very effective. I am planting zinnia from seed. If you have Zinnias planted in your garden, both the leaves and flowers are susceptible to attack from Earwigs. It’s easy to conclude that pests are responsible for eating your Zinnias. Do not use thiophanate methyl fungicides, as these are ineffective. Spray with insecticides every few weeks to control sucking insects which spread the viruses. But now, some of those plants have ugly leaf like this. Zinnia elegans, (syn. Only two diseases are commonly troublesome on zinnias (Zinnia elegans), powdery mildew and Alternaria blight. Spindly Shoots; Foliage Are Yellowed, Curled By Virus Diseases Various diseases caused by viruses occasionally attack zinnias. It is carried by aster leafhoppers (Macrosteles quadrilineatus), which are insects that feed on the sap of the plants. Species include: Zinnia acerosa (syn. Since spider mites thrive in hot, dry weather, reducing drought stress with supplemental irrigation will help prevent an infestation. Plants are 12-18 inches in height and extremely disease resistant. 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. 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. Integrated Pest Management Strategies. Destroy infected plant. These zinnias have become infected with powdery mildew (Golovinomyces cichoracearum).Mary Ann Hansen, Virginia Polytechnic Institute & State University, Bugwood.org. 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. Use natural predators such as parasitic wasps to keep away aphids from your Zinnias. Alternaria blight is the most common and conspicuous. Since spider mites thrive in hot, dry weather, reducing drought stress with supplemental irrigation will help prevent an infestation. Stems of these annuals will deteriorate over the winter, and we do not have research weighing their value for insects over the winter. Follow label directions for mixing and use. 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. 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