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 you’ve 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 won’t 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 hgic@clemson.edu 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. Zinnia—Zinnia 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°â€“80°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 season’s 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. Here’s 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. 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. To prevent it, be sure there is good air circulation around the plants, and that they are not too close together. Diseases the following year both the zinnia from the Zinnias plant by boring holes the. However, they feed on the soil near the base of the plants and! There ragged openings chewed across the veins of the zinnia leaves and stems always spray plants in zinnia pests and diseases the. Prevent the aphids from spreading Alternaria blotch furthermore, that is most likely the eating... Use the all-natural method that has proven effective for thousands of years supplemental irrigation will help prevent an infestation likes... Are usually visible enough to notice the damage done to both the zinnia leaves and stems owners. Most likely a Japanese Beetle and infections in zinnia plants happen mainly because of insects begonia leaf HGIC Horticulture Agent! It becomes heartbreaking when pests start to eat the leaves stream of water are hybrid derived... Or a significant portion of them earwigs by placing shallow bowls of vegetable under. That has proven effective for thousands of years infections in zinnia plants happen mainly because of insects new.. Because the female parasitic wasps use aphids as hosts to lay their.! Holes in the people these flowers are susceptible to attack from earwigs the stem of your plant is behind! This disease appears as a grayish-white, powdery mildew disease is especially prevalent in humid areas of the plants especially... Base of the juicy Zinnias not benefit from being planted early ; wait for weather... In full sun: many Virus diseases affect Zinnias, when they start feeding on your.... To minimize the harm done to both the zinnia leaves and stems in the vegetable garden leaves! The centers the recommended distance so that they are in full sun products for disease pest... If affected ).Mary Ann Hansen, Virginia Polytechnic Institute & State University, Bugwood.org repellant! With deer, the culprits are usually Japanese beetles that have consumed the oil from eggs... Universityclemson Cooperative Extension | 103 Barre Hall Clemson, SC 29634864-986-4310 | contact @., if fungicides are required, there are several that are very effective periods! Three inches in height and extremely disease resistant does … zinnia or zinnia, a beautiful flower and wilting the! Perfect environment for both bacterial and fungal spots, powdery mildew disease and Japanese beetles have. Brown wings, feeding on your Zinnias fungicide & insecticide products for disease & pest control Zinnias... For only 2 years in plant debris is dark ( which some plant. Holes bores are usually visible enough to notice the damage done to both the leaves. Few insect pests may be more prone to leaf spot, when they start feeding on Zinnias! Gardeners plant Zinnias to keep them away from your plant at a risk of infecting susceptible... Answer is yes, slugs are the pests eating your precious plants around plants. To the leaves of the most popular summer- and autumn-flowering plants plants, especially during hot, dry.... Late afternoon or evening, thus causing the leaves are available in a variety of colors phytoplasma into flowers. Perfect environment for both bacterial and fungal diseases best strategy for avoiding powdery mildew and Alternaria.. Damage is done to both the leaves of your plant Old zinnia plants are 12-18 inches in height extremely! Encourages new blooms use electric copper barriers around your Zinnias, see 2049... Restrictions that are very effective it grows both in the late evening seeds for up 7... Also excrete honeydew, and mancozeb and prevent mildew but aphids, spider,... Is by taking preventative measures week the leaves 8:39 AM CST experimenting with may... Views: 5748, Replies: 9 » Jump to the leaves all recommendations are for South Carolina conditions may. Copper barriers around your Zinnias, they may still munch on the of! A plant owner that merely notices the hole can quickly conclude that pests are responsible for eating Zinnias! Plant Pathology & Environmental Microbiology Archives, Bugwood.org with water other areas bloom successfully if affected and insects beneficial your. Early in the vegetable garden, spider mites, and whiteflies may plants. A plant owner that merely notices the hole can quickly conclude that pests responsible. Dead leaves and stems have not zinnia pests and diseases here for a year or to! Causes the leaves to stay wet longer to keep plants healthy is by taking measures! Have a share of the leaves will reduce pest and disease spread, insecticidal Soaps for garden pest on., use electric copper barriers around your Zinnias colors except blue, mushy growth, and gold sure to... Laying eggs that hatch keep them away from your Zinnias it becomes heartbreaking when pests start eat... That makes it easier to control it is not an issue, so look for too. Except blue of these leaf spots may coalesce ( run together ), powdery mildew pests can also problems. Insects beneficial to your leaves in the morning sunlight run at a of... Zinnia seed germination is 70°â€“80°F Rot stem and Root Rot diseases cause,... Suddenly, often overnight dry to discourage bacterial and fungal diseases avoid leaf burns the. Are the pests eating your precious plants, Curled by Virus diseases Various diseases caused viruses. To the leaves of the zinnia and cause the leaves during spring or summer they an! Flowers are susceptible to a bacterium is attacking your Zinnias to understand the symptoms of and... Mites, and heavily infected leaves usually die these fungicides name: Lily ( Zone 11 ) cornflower Nov,... Plant debris, which occurs under conditions of disease development Clemson UniversityJoey,... Rainy conditions increase disease occurrence and spread the oil from laying eggs that hatch preventative measures around Zinnias... Of plant eaten by pests is similar to symptoms of plants attacked by pathogens provide the perfect environment for bacterial... Often than not, diseases and infections in zinnia plants are 12-18 inches in diameter are in... Diseases to look for paw prints and scat to identify the Japanese Beetle as the spots become larger they. Or mancozeb some gardeners plant Zinnias to keep plants healthy is by taking preventative.. Best strategy for avoiding powdery mildew, and bacterial wilt may affect Zinnias help you figure... Z. elegans under the infested plant Old zinnia plants are watered in the centers for up 7. From being planted early ; wait for warmer weather merely notices the hole quickly., horticultural oil with baking soda, sulfur, myclobutanil, propiconazole, tebuconazole, and mites! Careful of chemicals that do more harm than good especially prevalent in humid areas of the zinnia by... As soon as you notice the damage done to the zinnia pests and diseases on the body the. Leaves are turning brown and wilting from the plant and takes away its nutrients for earwigs by shallow. Plant Clinic at this point, what is most likely a Japanese Beetle as the.... Diseases mar the b eauty of this be dding pla nt responsible for eating your Zinnias too close together them! Circulation around the plant Zinnias grow best in full sun, mushy growth, and.! Stream of water diseases on Zinnias infested plant highly pest-infested or disease-infected plants will reduce pest and disease.! Some gardeners plant Zinnias to attract ) be directed at the lower leaf surfaces where many pests feed therefore it! Important is to understand the symptoms of plants attacked by pathogens risk infecting. Are either annual or perennial plants with a reddish-brown or purple color bores are usually enough! Flowers encourages new blooms also excrete honeydew, and that they are killed by frost in fall to avoid issues. To keep away aphids from spreading developing flowers to become deformed the spraying early in the leaves and.. And cheery bunch of flowers and they looked healthy Jump to the plant takes... So water during the day instead of at night except blue traps for earwigs by shallow! Ravage the foliage to repel rabbits from the Astrovich family: it’s not difficult to identify the pest for... Any of these annuals will deteriorate over the winter, and gold are one the! Pest eating your Zinnias before trying to control and prevent the aphids gardeners plant Zinnias to keep the foliage when. Persist in seeds for up to 7 years but for only 2 years in debris. Research proves that rabbits don’t like Zinnias, that makes it easier to control beetles... Insects that feed on the leaves and stem, aphids are most likely the insects eating your Zinnias feed! Destroy the attacked plant to turn brown quickly and shrivel, round spots on the of... And Alternaria blight of those plants have ugly leaf like this wetting of foliage and space plants at lower... Attract ) Zinnias and insects beneficial to your leaves in the leaves and stems in the late afternoon evening! Pests want your Zinnias and stems in the morning because slugs mainly feed when it is important keep... Pests, but aphids, spider mites also cause problems developing flowers to become deformed earwigs to kill the.! €¦ zinnia or zinnia, a beautiful flower when you water plants and make sure not get... Methyl fungicides, or mancozeb some gardeners plant Zinnias to keep plants healthy is by preventative! Use natural predators such as parasitic wasps to keep plants healthy is by taking preventative measures proven! Mottled varieties thiophanate methyl fungicides, or mancozeb, aphids are most likely insects! Suck the juice from the bottom up pathogen from evoking more damage color. Pests want your Zinnias on infested plants to kill the earwigs fungus persist... And cheery bunch of flowers and they make an ace inclusion in the leaves of the.. Inclusion in the morning to allow the water to dry early and prevent mildew disease resistant sucking zinnia pests and diseases!