For starters, many pests want your Zinnias as much as you do. Zinnias are rarely attacked by insects. This method works because the female parasitic wasps use Aphids as hosts to lay their eggs. The center of these leaf spots may eventually tear, fall out, and leave behind holes in the leaves. Z. violacea) is the most common. Spray with insecticides every few weeks to control sucking insects which spread the viruses. Usually, they bore tiny holes into the Zinnias leaves and flowers. Hi all , I have not come here for a long time. Fungus grows best on damp foliage, so either water the plants with a dripper system or soaker hose, or if youâve installed an overhead sprinkler system, water in the morning. Prune out diseased tissue and destroy it. Whiteflies also excrete honeydew, and it causes the leaves of your zinnia plant to turn yellow and die. That way, it wonât be difficult to identify the pest eating your Zinnias. 3. 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. Spots may develop a yellow halo. Table 1. If this document didn’t answer your questions, please contact HGIC at email@example.com or 1-888-656-9988. These sap-sucking insects love to suck the juice from the Zinnias plant by boring holes into the leaves and stems. Alternaria blight is the most common and conspicuous. ZinniaâZinnia spp. Always spray flowering ornamentals in the late evening. Pick out slugs as soon as you notice them. Additionally, they feed mostly at night. 1. Spray plants following rainy periods, as rainy conditions increase disease occurrence and spread. Spray Zinnias with neem oil to control Japenese Beetles. From summer to fall, Earwigs like to have a share of the juicy Zinnias. Stems of these annuals will deteriorate over the winter, and we do not have research weighing their value for insects over the winter. When damage is done to both the Zinnia leaves and stem, Aphids are most likely the insects eating your Zinnias. 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). 2. Mildew likes cool, wet conditions, so water during the day instead of at night. Do not use thiophanate methyl fungicides, as these are ineffective. The ideal soil temperature for zinnia seed germination is 70°â80°F. 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. Just like bacterial leaf spot, when they become gray, they wither leaving holes in the leaves. However, zinnias often carry powdery mildew and other diseases. Barbara H. Smith, HGIC Horticulture Extension Agent, Clemson UniversityJoey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. Zinnias grown as ornamental flowers are hybrid species derived from Z. elegans. Disease incidence is greater if plants are watered in the late afternoon or evening, thus causing the leaves to stay wet longer. The better fungicides to control Alternaria leaf spot are chlorothalonil, copper fungicides, and mancozeb. Zinnias have few insect pests, but aphids, spider mites, and whiteflies may damage plants, especially during hot, dry weather. If your answer is yes, slugs are the pests eating your Zinnias. Prompt removal of any highly pest-infested or disease-infected plants will reduce pest and disease spread. Practice good cultural methods. Spray neem oil in the evening to avoid leaf burns during the day. As they feed, they inject the phytoplasma into the vascular system of the zinnia and cause the developing flowers to become deformed. Informational table showing disease name, symptoms, pathogen/cause, and management of Zinnia diseases. 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. Zinnias can be susceptible to fungal diseases, especially powdery mildew. smpatton Springdale, AR May 03, 2015. Moreover, they often leave behind some of their droppings when they are done snacking on the leaves. Additional newcomers to the zinnia world include the 'Profusion®' series (Zinnia x hybrida) and the 'Zahara®' series (Zinnia marylandica). Follow all directions, precautions and restrictions that are listed. Nevertheless, it becomes heartbreaking when pests start to eat the leaves. Therefore, it is best to always water near the base of the plants. Insecticidal soap sprays must be directed at the lower leaf surfaces where many pests feed. This is the source of next seasonâs inoculum. Make sure not to compost them; otherwise, you run at a risk of infecting other susceptible plants with the pathogens. About 20 species. Ok. Try not to get the foliage wet when you water plants and make sure they are in full sun. Pests and diseases. 4 / 10. deyanarobova/Getty Images. Keep plants in good vigor. Mark unread; Skip to new; Mark unread Print Skip to new. There is no control method once the flowers have been infected, and plants with symptoms should be promptly removed and discarded in the trash. Copyright © 2020 Clemson UniversityClemson Cooperative Extension | 103 Barre Hall Clemson, SC 29634864-986-4310 | Contact UsHGIC@clemson.edu. 1 to 2 weeks after your average last frost date. Eventually the leaves turn yellow and drop. Neem oil can help to reduce the rate at which they feed on the plants. You can set traps for earwigs by placing shallow bowls of vegetable oil under the infested plant. But now, some of those plants have ugly leaf like this. Which Foods Should I Select to Promote Health? Zinnia elegans, (syn. 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. ALTERNARIA LEAF SPOT OR BLIGHT Space plants at the recommended distance so that they all have good airflow. Spray plants weekly with a copper fungicide following periods of leaf wetness to reduce disease incidence. It is carried by aster leafhoppers (Macrosteles quadrilineatus), which are insects that feed on the sap of the plants. Moreover, bunnies that are still experimenting with taste may eat the plants. Hereâs the interesting part: the symptoms of plant eaten by pests is similar to symptoms of plants attacked by pathogens. Watch Reply. If you have rabbits as pets, always keep them away from your Zinnias. Cercospora leaf spots on foliage are typically reddish-purple, small, and round with light gray to almost white centers. The most common problem for zinnias is powdery mildew. Japanese Beetles could be the insect that eats your Zinnias. 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. Plants are 12-18 inches in height and extremely disease resistant. 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. zinniae). If you see any of these signs, rabbits are definitely the ones feeding on your Zinnias. 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. For this reason, this article will help you to figure out what pests could be eating your precious plants. 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