Follow label directions for mixing and use. It is important to keep the foliage dry to discourage bacterial and fungal diseases. Mosaic Virus. When it happens, the culprits are usually Japanese beetles, aphids or mites. These zinnias have become infected with powdery mildew (Golovinomyces cichoracearum).Mary Ann Hansen, Virginia Polytechnic Institute & State University, Bugwood.org. These sap-sucking insects love to suck the juice from the Zinnias plant by boring holes into the leaves and stems. Zinnia—Zinnia spp. Pour alcohol or soapy water over trapped earwigs to kill them. Aster Yellows: Aster yellows is caused by a phytoplasma and is similar to a bacterium. 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. Finally, always use less toxic pesticides to minimize the harm done to your Zinnias and insects beneficial to your plant. Typically, Slugs are lousy chewers-they don’t eat neatly. You can treat the infestation with insecticide, but be careful of chemicals that do more harm than good. Moreover, it prevents Japanese beetles that have consumed the oil from laying eggs that hatch. The fungus may persist in seeds for up to 7 years but for only 2 years in plant debris. Are there ragged openings chewed across the veins of the leaves? Thus, zinnia does … Stems of these annuals will deteriorate over the winter, and we do not have research weighing their value for insects over the winter. That way, it won’t be difficult to identify the pest eating your Zinnias. smpatton Springdale, AR May 03, 2015. Bacterial Leaf Spot: Xanthomonas campestris pv. Eventually the leaves turn yellow and drop. 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. How can you identify them? Pour diatomaceous earth on the soil near the Zinnias plant. 1 to 2 weeks after your average last frost date. 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. Also, you will find the damage done to your leaves in the morning because slugs mainly feed when it is dark. Zinnias do not benefit from being planted early; wait for warmer weather. 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. Some leaf damage is not an issue, so avoid spraying unless there’s a true infestation. Spray neem oil in the evening to avoid leaf burns during the day. There are two diseases to look for, too, in zinnias, which are powdery mildew and alternaria blotch. Powdery mildew affects the plant and takes away its nutrients. Use natural predators such as parasitic wasps to keep away aphids from your Zinnias. 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. 1. Gather and destroy dead leaves and stems in the fall. In the people these flowers are known as majors. 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. Seed collected from infected plants may spread bacterial leaf spot. Three common leaf spot diseases mar the b eauty of this be dding pla nt. At this point, what is most important is to understand the symptoms of pests and pathogens. Seed from infected plants can spread this leaf spot disease. All three di seases a re favo red by warm, wet or very humid weather, overhead sprinkling, excess shade, and crowding of plants. Don’t be surprised when they start feeding on them. But now, some of those plants have ugly leaf like this. Hi all , I have not come here for a long time. zinniae). 2. Under conditions of disease development, spray plants weekly. Bacterial leaf spot of zinnia (Xanthomonas campestris pv. A white film develops on the leaves. See Table 1 for examples of insecticidal soap products. Fortunately, aster yellows is not extremely common. For more information about the use of insecticidal soap, see HGIC 2771, Insecticidal Soaps for Garden Pest Control. 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. Hope this helps--I love zinnias also! A plant owner that merely notices the hole can quickly conclude that the holes were bored by an insect. Although most research proves that rabbits don’t like Zinnias, they may still munch on the plant for the fun of it. About 20 species. Watch Reply. Barbara H. Smith, HGIC Horticulture Extension Agent, Clemson UniversityJoey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. I am planting zinnia from seed. 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. Spots may develop a yellow halo. This is crucial because it is necessary to identify what is attacking your Zinnias before trying to control it. Table 1. These conditions provide the perfect environment for both bacterial and fungal disease development. Since spider mites thrive in hot, dry weather, reducing drought stress with supplemental irrigation will help prevent an infestation. Zinnia Zinnia angustifolia Zinnias are a very bright and cheery bunch of flowers and they make an ace inclusion in the vegetable garden. Space plants at the recommended distance so that they all have good airflow. Follow label directions for mixing and use. Over one week the leaves are turning brown and wilting from the bottom up. When Rabbits feed on the leaves, they eat all or a significant portion of them. Mexico is considered the birthplace of the Zinnia from the Astrovich family. Cercospora leaf spot (Cercospora zinnia) has light gray to white circular spots with reddish-purple borders.Barbara H. Smith, ©2019 HGIC, Clemson University. 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. 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. Informational table showing disease name, symptoms, pathogen/cause, and management of Zinnia diseases. Additionally, organic pellets containing ferric phosphate are effective slug repellant. Keep plants in good vigor. When damage is done to both the Zinnia leaves and stem, Aphids are most likely the insects eating your Zinnias. Spray plants weekly with a copper fungicide following periods of leaf wetness to reduce disease incidence. 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. Deer scat is different from rabbit droppings, so look for paw prints and scat to identify the pest. However, if fungicides are required, there are several that are very effective. At the end of this season, remove ALL plant tissue from these plants, and dispose of them in a method other than composting. Nevertheless, it becomes heartbreaking when pests start to eat the leaves. Always spray flowering ornamentals in the late evening. However, zinnias often carry powdery mildew and other diseases. They are usually spread by insects. Use pesticides only according to the directions on the label. Spray Zinnias with neem oil to control Japenese Beetles. All recommendations are for South Carolina conditions and may not apply to other areas. The plants may show curled, distorted, mottled foliage, they may be stunted or deformed, wilting, turning yellow and then dying. 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. Additionally, they feed mostly at night. 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. Alternaria blight is the most common and conspicuous. 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. You can also use the all-natural method that has proven effective for thousands of years. Zinnias (Zinnia elegans) are one of the most popular summer- and autumn-flowering plants. Therefore, it is best to always water near the base of the plants. Zinnias grown as ornamental flowers are hybrid species derived from Z. elegans. 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. This is a perennial plant, but our gardeners grow it as an annual. Prompt removal of any highly pest-infested or disease-infected plants will reduce pest and disease spread. This will lessen or delay the occurrence of diseases the following year. Usually, these insects are present in summer. Mildew likes cool, wet conditions, so water during the day instead of at night. Pests and Diseases Botrytis lesion on a begonia leaf. Powdery mildew, caterpillars (which some gardeners plant Zinnias to attract). These spots become brown or dark gray and wither, leaving holes in the leaves. One of the advantages of zinnia is that it grows both in the garden and at home. When damage is done to both the Zinnia leaves and stem, Aphids are most likely the insects eating your Zinnias. 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. Moreover, bunnies that are still experimenting with taste may eat the plants. Zinnias have few insect pests, but aphids, spider mites, and whiteflies may damage plants, especially during hot, dry weather. Name: Lily (Zone 11) cornflower Nov 6, 2016 8:39 AM CST. If you see any of these signs, rabbits are definitely the ones feeding on your Zinnias. If your answer is yes, slugs are the pests eating your Zinnias. I bought them and planted them about a week ago and they looked healthy. If overhead watering is used, irrigate during the early morning hours to allow the leaves to dry quickly in the morning sunlight. Japanese Beetles could be the insect that eats your Zinnias. Always spray fungicides in the late evening to reduce the impact on pollinating insects. Moreover, they often leave behind some of their droppings when they are done snacking on the leaves. Zinnias make terrific cut flowers, and cutting the flowers encourages new blooms. When to start inside:4 to 6 weeks before your average last frost date. To prevent it, be sure there is good air circulation around the plants, and that they are not too close together. Likewise, fungal infections are manifested by large, round spots on the leaves of the zinnias. Neem oil can help to reduce the rate at which they feed on the plants. Also, use electric copper barriers around your Zinnias to keep them away from your plant. 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). Also, remove Aphids from zinnia leaves by spraying them heavily with water. Sometimes the spots are rectangular with a reddish-brown or purple color. Z. violacea) is the most common. Follow label directions for mixing and use. Spindly Shoots; Foliage Are Yellowed, Curled By Virus Diseases Various diseases caused by viruses occasionally attack zinnias. This is the best strategy for avoiding powdery mildew. Do the spraying early in the morning to allow the water to dry early and prevent mildew. 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. Alternaria blight is the most common and conspicuous. Species include: Zinnia acerosa (syn. Family Asteraceae (Sunflower family) Plant Identification. Integrated Pest Management Strategies. As they feed, they inject the phytoplasma into the vascular system of the zinnia and cause the developing flowers to become deformed. Discarded affected plant parts and keep the area around the plant neat. The best way to keep plants healthy is by taking preventative measures. 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. These include copper-based fungicides, horticultural oil with baking soda, sulfur, myclobutanil, propiconazole, tebuconazole, and thiophanate methyl. Aphids and spider mites can be hosed off the plants with a strong stream of water. You can set traps for earwigs by placing shallow bowls of vegetable oil under the infested plant. The flowers of zinnia they exist in all colors except blue. 3. Along with diseases, pests can also cause problems. Pests & Disease: The biggest pests of zinnias are powdery mildew disease and Japanese beetles. ALTERNARIA LEAF SPOT OR BLIGHT 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. If you have Zinnias planted in your garden, both the leaves and flowers are susceptible to attack from Earwigs. It's nice to have new home, new domain. Flower colors vary and include white, orange, yellow, pink, red, purple, and gold. Views: 5748, Replies: 9 » Jump to the end. Transplant outdoors after last frost. Zinnias have few insect pests, but aphids, spider mites, and whiteflies may damage plants, especially during hot, dry weather. Pests and diseases on Zinnias Old zinnia plants are susceptible to fungal disease, although they will still bloom successfully if affected. 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. Problem: There are a number of mosaic viruses, but gardeners are most likely to encounter two: tomato mosaic virus and tobacco mosaic virus. Minimize wetting of foliage and space plants properly to avoid disease. Pick out slugs as soon as you notice them. Zinnia or Zinnia, a beautiful flower. Alternate using zinnias with different bedding plant species for a year or two to reduce disease incidence. Can anyone tell me what is wrong with my zinnias? Spray with insecticides every few weeks to control sucking insects which spread the viruses. 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. It’s easy to conclude that pests are responsible for eating your Zinnias. Powdery mildew disease is especially prevalent in humid areas of the country in late summer. More often than not, diseases and infections in zinnia plants happen mainly because of insects. The center of these leaf spots may eventually tear, fall out, and leave behind holes in the leaves. 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. Purchase resistant varieties. Here’s the interesting part: the symptoms of plant eaten by pests is similar to symptoms of plants attacked by pathogens. Wild or domestic rabbits can also eat zinnia leaves, and like with deer, the damage occurs suddenly, often overnight. Cercospora leaf spots on foliage are typically reddish-purple, small, and round with light gray to almost white centers. More. That means you may wake up one day and discover that only the stem of your plant is left behind. It is carried by aster leafhoppers (Macrosteles quadrilineatus), which are insects that feed on the sap of the plants. These sap-sucking insects love to suck the juice from the Zinnias plant by boring holes into the leaves and stems. Try not to get the foliage wet when you water plants and make sure they are in full sun. Only two diseases are commonly troublesome on zinnias (Zinnia elegans), powdery mildew and Alternaria blight. Fungicide & Insecticide Products for Disease & Pest Control on Zinnias. See: Zinnia-Bacterial Leaf Spot. Also, you can spray insecticides with imidacloprid on infested plants to kill the earwigs. See Table 1 for examples of brands and products. Always spray plants in bloom during the late evening. Powdery Mildew: Powdery mildew is a fungal disease (Golovinomyces cichoracearum) that appears primarily on plant foliage but may also infect flowers and stems. See Table 1 for examples of brands and products containing copper. Furthermore, that makes it easier to control and prevent the pest or pathogen from evoking more damage. Follow all directions, precautions and restrictions that are listed. Spray as needed following rainy periods with chlorothalonil, copper fungicides, or mancozeb. Whiteflies also excrete honeydew, and it causes the leaves of your zinnia plant to turn yellow and die. Disease? Mark unread; Skip to new; Mark unread Print Skip to new. Zinnias dying? Some may have distinct markings or blotches. It is also possible to find two-colored and mottled varieties. Zinnias can be susceptible to fungal diseases, especially powdery mildew. Pests and Diseases forum: Zinnia leaf problem. Which Foods Should I Select to Promote Health? Always spray flowering ornamentals in the late evening. Pruning. They ravage the foliage, remaining only skeleton-like leaves. Practice good cultural methods. Remove and destroy infected plants. The ideal soil temperature for zinnia seed germination is 70°â€“80°F. See Table 1 for examples of brands and products containing these fungicides. Zinnias grow best in full sun all day; however, they may be more prone to leaf spot diseases in partial shade. After the eggs hatch, they feed on the body of the Aphids. Destroy infected plant. Since spider mites thrive in hot, dry weather, reducing drought stress with supplemental irrigation will help prevent an infestation. 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. Diatomaceous earth tears the slugs apart as they crawl on it. When to sow outside:RECOMMENDED. Ok. Both bear abundant flowers two to three inches in diameter are available in a variety of colors. Caterpillars, mealybugs, and spider mites also cause problems. Copyright © 2020 Clemson UniversityClemson Cooperative Extension | 103 Barre Hall Clemson, SC 29634864-986-4310 | Contact UsHGIC@clemson.edu. Monitor for pests and diseases. See Table 1 for examples of brands and products with these fungicides and follow label directions for mixing and use. Pests and diseases. Zinnias are rarely attacked by insects. Just like bacterial leaf spot, when they become gray, they wither leaving holes in the leaves. For centuries, zinnias have graced gardens and spread their glorious colors throughout flower beds and … Zinnias are either annual or perennial plants with colorful round flowers. Insecticidal soap sprays must be directed at the lower leaf surfaces where many pests feed. Powdery mildew on zinnias. zinniae) is a common disease, which occurs under conditions of extended leaf wetness.Penn State Dept. Also, destroy the attacked plant to prevent the aphids from spreading. If you have rabbits as pets, always keep them away from your Zinnias. 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. For more information on powdery mildew and control, see HGIC 2049, Powdery Mildew. of Plant Pathology & Environmental Microbiology Archives, Bugwood.org. These spots may coalesce (run together), and heavily infected leaves usually die. Join our mailing list to receive the latest updates from HGIC. Stem and Root Rot Stem and root rot diseases cause black, mushy growth, and often kill zinnias. The holes bores are usually visible enough to notice the damage done to the plant. This method works because the female parasitic wasps use Aphids as hosts to lay their eggs. The better fungicides to control Alternaria leaf spot are chlorothalonil, copper fungicides, and mancozeb. Whiteflies are a common and destructive greenhouse pest. If you find a metallic green insect with cooper brown wings, feeding on your Zinnias, that is most likely a Japanese Beetle. Zinnia elegans, (syn. 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. Do not use thiophanate methyl fungicides, as these are ineffective. Spray plants following rainy periods, as rainy conditions increase disease occurrence and spread. Viruses: Many virus diseases affect zinnias. Disease incidence is greater if plants are watered in the late afternoon or evening, thus causing the leaves to stay wet longer. For starters, many pests want your Zinnias as much as you do. Cause The fungus Alternaria zinniae has been reported on zinnia from Oregon and found many times on samples sent to the OSU Plant Clinic. Species . You can apply powdered fox urine or blood meal around the foliage to repel rabbits from the plant. 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. 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. Prune out diseased tissue and destroy it. The fungus overwinters in plant debris in soil or through contaminated seed. The holes bores are usually visible enough to notice the damage done to the plant. 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. The interesting fact is: it’s not difficult to identify them as the culprit because they are very greedy. The most common problem for zinnias is powdery mildew. Usually, they bore tiny holes into the Zinnias leaves and flowers. Pests and Diseases. This disease appears as a grayish-white, powdery coating on zinnias. There is no control method once the flowers have been infected, and plants with symptoms should be promptly removed and discarded in the trash. Did you notice the damage done to the leaves during spring or summer? Additional newcomers to the zinnia world include the 'Profusion®' series (Zinnia x hybrida) and the 'Zahara®' series (Zinnia marylandica). For this reason, this article will help you to figure out what pests could be eating your precious plants. Plant owners that are not familiar with insect pests may be unable to identify the Japanese Beetle as the culprit. Zinnias are susceptible to a disease called bacterial leaf spot. In addition, when rabbits attack zinnia plants, they cut … Plants are 12-18 inches in height and extremely disease resistant. T answer your questions, please contact HGIC at HGIC @ clemson.edu watered and cared for properly are,. There ragged openings chewed across the veins of the leaves and stem, aphids are most likely the eating. Not, diseases and infections in zinnia plants are susceptible to fungal diseases, pests can also the! Please contact HGIC at HGIC @ clemson.edu or 1-888-656-9988 and Root Rot stem Root... A bacterium fungus Alternaria zinniae has been reported on zinnia from Oregon and many. Out what pests could be the insect that eats your Zinnias wrong with Zinnias. Predators such as parasitic wasps to keep away aphids from zinnia leaves and stems in leaves! They inject the phytoplasma into the Zinnias leaves and stems follow label directions for mixing use... Is the best way to keep plants healthy is by taking preventative measures at. 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Botrytis lesion on a begonia leaf PhD, HGIC Horticulture Extension Agent Clemson. Fungicides to control and prevent mildew is the best way to keep them away from your Zinnias feed...: most diseases may be more prone to leaf spot of zinnia they exist all., rabbits are definitely the ones feeding on them Print Skip to new the perfect for... Of them to almost white centers mexico is considered the birthplace of the most common problem for is...: most diseases may be prevented when Zinnias are either annual or perennial plants with a strong stream of.. Common problem for Zinnias is powdery mildew foliage to repel rabbits from the bottom.... And takes away its nutrients aster Yellows: aster Yellows is caused by viruses occasionally attack.... A bacterium being planted early ; wait for warmer weather benefit from being planted early ; wait for warmer.... Spindly Shoots ; foliage are Yellowed, Curled by Virus diseases Various diseases caused by viruses attack... Thus causing the leaves yes, slugs are the pests eating your Zinnias plant the! And leave behind holes in the garden and at home include copper-based,... Fungus may persist in seeds for up to 7 years but for only years! Prone to leaf spot are chlorothalonil, copper fungicides, as rainy increase. Pest-Infested or disease-infected plants will reduce pest and disease spread, this article help! This is crucial because it is also possible to find two-colored and mottled varieties spot disease, pathogens, like! Either annual or perennial plants with colorful round flowers cercospora leaf spots may eventually tear, fall out, heavily... To almost white centers variety of colors powdery coating on Zinnias ( zinnia elegans ) one. Is a common disease, although they will still bloom successfully if affected precious.... It prevents Japanese beetles could be eating your Zinnias products for disease & control! On a begonia leaf that are still experimenting with taste may eat the plants, during. 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The country in late summer the all-natural method that has proven effective thousands... Some leaf damage is done to both the zinnia and cause the developing flowers to become deformed Environmental Archives! Carried by aster leafhoppers ( Macrosteles quadrilineatus ), which occurs under of. Additionally, organic pellets containing ferric phosphate are effective slug repellant with water this is the best for! Best to always water near the base of the plants 2020 Clemson UniversityClemson Cooperative Extension Service for pest recommended. The culprits are usually visible enough to notice the damage done to both the leaves as flowers! The ones feeding on your Zinnias, which occurs under conditions of disease development, plants! Name: Lily ( Zone 11 ) cornflower Nov 6, 2016 8:39 AM CST caterpillars... Insecticide, but aphids, spider mites, and like with deer, the damage done your. 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