Spores, which cause additional infections, are produced in the necrotic tissue. Avoid over-head irrigation. This tissue eventually browns and dies. How do I avoid problems with leaf streak in the future? We teach, learn, lead and serve, connecting people with the University of Wisconsin, and engaging with them in transforming lives and communities. COVID-19 Extension Updates and Resources ... More Information », Pathogen: Aureobasidium microstichum, previous name: Collecephalus hemerocalli. The disease is most common in warm, wet weather. The fungus responsible for the rust is Puccinia hemerocallidis and will appear as orange-yellow powdered specks on leaves and scapes. Plant to plant spread can also occur when people or animals move through wet foliage. This will improve air circulation and promote more rapid drying of leaves. Day Lilies' Diseases and Their Cures. In the spring or summer, with the return of favorable conditions, spores are again produced and provide the source for initial infections. Use fungicides only during periods of wet weather. A. Daylily plants are among one of the most popular perennial landscaping flowers. Leaf streak is a common disease of daylilies, affecting daylilies wherever they are grown. Yellowing and browning of leaves typical of daylily leaf streak. These are more angular and elongated than those formed by rust. Note below that the affected part of the leaf is the center midline vein then outward as the disease progresses. Make 3-4 applications at 2-wk intervals. Red-brown flecks may also be a symptom of leaf streak. Pathogen cycle: The fungus (see photo 2 above) persists through the winter within dead leaf tissue. Daconil 2787 can be used by home gardeners. Daylily varieties can vary widely in terms of their susceptibility to the disease. Spores produced on infected leaves lead to additional infections. Remove and destroy dead leaves after the first hard freeze. Be sure to read and follow all label instructions of the fungicides that you select to ensure that you use them in the safest and most effective manner possible. (Photo courtesy of Doug Maxwell), Megan Meyers* and Brian Hudelson, UW-Madison Plant Pathology Revised:  4/24/2014 Item number:  XHT1235. Disease development is dependent on moisture supply and temperature. 1. Susceptibility varies among cultivars. DO NOT use the same active ingredient for all treatments. These flecks enlarge, turn brown and become surrounded by yellow halos. When temperatures are above 90F, disease development slows. While robust, there are some issues that may cause these plants to struggle in the garden. Oftentimes leaf streak is a cosmetic problem, causing little damage. Daylily varieties can vary widely in terms of their susceptibility to the disease. Connect with your County Extension Office », Find an Extension employee in our staff directory », Get the latest news and updates on Extension's work around the state, Feedback, questions or accessibility issues: info@extension.wisc.edu | © 2020 The Board of Regents of the University of Wisconsin System Privacy Policy | Non-Discrimination Policy | Discrimination and Harassment Complaints | Disability Accommodation Requests | Civil Rights. Resistant varieties include: Betty Bennet, Edna Spalding, Ella Pettigrew, Globe Trotter, Nancy Hicks, Pink Superior, Ron Rousseau, Sudie, Tropical Tones, Upper Room, and Winsome Lady. Streak disease after daylilies have bloomed. Alternate the use of at least two active ingredients to help minimize problems with fungicide-resistant strains of the leaf streak pathogen. Where does leaf streak come from? The 2006 Georgia Pest Management Handbook lists Daconil 2787 and Daconil Ultrex. To further limit pathogen spread, avoid working with plants when they are wet. Streak is a fungus that causes plants, especially the leaves turn brown and ugly after blooming, but it doesn’t do permanent damage to the plants. This can spread the leaf streak fungus, as well as wet leaves, creating conditions more favorable for infection. If sprays are not initiated until first sign of disease, continue sprays at 2-wk intervals through bloom. Leaf dieback symptoms follow and usually develop from the leaf tip downward. There are formulations of these products and/or active ingredients registered for use in South Carolina. Leaf streak is a fungal disease that affects daylily leaves during wet periods in spring. This fungus overwinters in infested daylily leaf debris where it produces spores that initiate the disease each spring. Heavily infected leaves often wither and die. How do I save a plant with leaf streak? Keep in mind however that even resistant varieties may not perform well every year and under all environmental conditions. In some cases however, leaf streak can cause substantial leaf loss, and rarely it may lead to complete defoliation of daylily plants. In the spring or summer, with the return of favorable conditions, spores are again produced and … Management: Wider spacing of plants to increase air circulation and management of overhead irrigation will aid in control by allowing leaves to dry. Symptom: (see photo 1 below) Initial symptoms consist of leaf spots which often form along the mid-vein. The 2006 North Carolina Agricultural Chemicals Handbook also lists mancozeb and thiophanate-methyl products. Start applications before you see symptoms and treat every seven to 14 days as long as wet weather persists. Leaf streak symptoms often initially appear as yellowing that begins at leaf tips and spreads down along and outward from the midveins of leaves. When spots coalesce, extensive necrotic areas develop and the tissue surrounding this becomes chlorotic. Fungus is the cause of some diseases that affect daylilies including daylily rust. Instead, use a soaker or drip hose to apply water directly into the soil. Remove dead leaves from your daylilies each fall to eliminate a source of the leaf streak fungus. Copyright © 2020 Clemson UniversityRegulatory Services511 Westinghouse Road, Pendleton, SC 29670864.646.2120 | Email Us. Mycelium of Aureobasidium microstichum. As the disease progresses, complete leaf death can occur. Leaf streak is caused by the fungus Aureobasidium microstictum. Remove infected leaves as they appear, and fertilize and water your plants properly to promote growth of new leaves. Rainy periods and overhead irrigation increase infection and enhance symptom development, since spore dissemination occurs naturally by splashing water. DO NOT water with a sprinkler. Daylily leaf streak may be avoided by purchasing disease-free stock plants and propagating only from healthy specimens. What does leaf streak look like? Feedback, questions or accessibility issues: © 2020 The Board of Regents of the University of Wisconsin System. Pathogen cycle: The fungus (see photo 2 above) persists through the winter within dead leaf tissue. Symptom of Daylily Leaf Streak              2. ... Another disease resulting from a fungus (Aureobasidum microstictum) is leaf streak. What is leaf streak? Oftentimes leaf streak is a cosmetic problem, causing little damage. are known for being generally disease-resistant, but they occasionally develop fungal problems in conditions of high moisture. As your daylily plants grow, divide them into smaller clumps and replant them with ample space between clumps. If you grow daylily varieties that suffer from severe leaf streak every year, consider applying fungicides containing chlorothalonil, mancozeb or thiophanate-methyl to prevent the disease.

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