Symptom: (see photo 1 below) Initial symptoms consist of leaf spots which often form along the mid-vein. are known for being generally disease-resistant, but they occasionally develop fungal problems in conditions of high moisture. To further limit pathogen spread, avoid working with plants when they are wet. Leaf dieback symptoms follow and usually develop from the leaf tip downward. These flecks enlarge, turn brown and become surrounded by yellow halos. In some cases however, leaf streak can cause substantial leaf loss, and rarely it may lead to complete defoliation of daylily plants. 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 fungus overwinters in infested daylily leaf debris where it produces spores that initiate the disease each spring. Daconil 2787 can be used by home gardeners. Remove and destroy dead leaves after the first hard freeze. Mycelium of Aureobasidium microstichum. Oftentimes leaf streak is a cosmetic problem, causing little damage. Alternate the use of at least two active ingredients to help minimize problems with fungicide-resistant strains of the leaf streak pathogen. The fungus responsible for the rust is Puccinia hemerocallidis and will appear as orange-yellow powdered specks on leaves and scapes. What does leaf streak look like? In the spring or summer, with the return of favorable conditions, spores are again produced and provide the source for initial infections. 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. Use fungicides only during periods of wet weather. These are more angular and elongated than those formed by rust. Start applications before you see symptoms and treat every seven to 14 days as long as wet weather persists. Learn more about this disease here. This will improve air circulation and promote more rapid drying of leaves. Leaf streak is a fungal disease that affects daylily leaves during wet periods in spring. COVID-19 Extension Updates and Resources ... More Information », Pathogen: Aureobasidium microstichum, previous name: Collecephalus hemerocalli. 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. 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. It is important to start sprays at emergence of new growth. DO NOT use the same active ingredient for all treatments. There are formulations of these products and/or active ingredients registered for use in South Carolina. The pathogen is a fungus called Aureobasidium microstictum. This can spread the leaf streak fungus, as well as wet leaves, creating conditions more favorable for infection. Oftentimes leaf streak is a cosmetic problem, causing little damage. Keep in mind however that even resistant varieties may not perform well every year and under all environmental conditions. Leaf streak is a common disease of daylilies, affecting daylilies wherever they are grown. How do I save a plant with leaf streak? Daylily plants are among one of the most popular perennial landscaping flowers. Rainy periods and overhead irrigation increase infection and enhance symptom development, since spore dissemination occurs naturally by splashing water. When spots coalesce, extensive necrotic areas develop and the tissue surrounding this becomes chlorotic. Burn (where allowed by local ordinance), deep bury or hot compost this material. In the spring or summer, with the return of favorable conditions, spores are again produced and … Fungus is the cause of some diseases that affect daylilies including daylily rust. How do I avoid problems with leaf streak in the future? Make 3-4 applications at 2-wk intervals. What is leaf streak? 1. When temperatures are above 90F, disease development slows. Avoid purchasing plants with any symptoms of the disease. ... Another disease resulting from a fungus (Aureobasidum microstictum) is leaf streak. Susceptibility varies among cultivars. Copyright © 2020 Clemson UniversityRegulatory Services511 Westinghouse Road, Pendleton, SC 29670864.646.2120 | Email Us. Daylily varieties can vary widely in terms of their susceptibility to the disease. Streak disease after daylilies have bloomed. If sprays are not initiated until first sign of disease, continue sprays at 2-wk intervals through bloom. Mycelium of Aureobasidium microstichum. Day lilies (Hemerocallis spp.) Where does leaf streak come from? Daylily varieties can vary widely in terms of their susceptibility to the disease. 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. Instead, use a soaker or drip hose to apply water directly into the soil. (Photo courtesy of Doug Maxwell), Megan Meyers* and Brian Hudelson, UW-Madison Plant Pathology Revised:  4/24/2014 Item number:  XHT1235. The 2006 Georgia Pest Management Handbook lists Daconil 2787 and Daconil Ultrex. Daylily leaf streak may be avoided by purchasing disease-free stock plants and propagating only from healthy specimens. DO NOT water with a sprinkler. Daylily leaf streak, for instance, can cause distress. Pathogen cycle: The fungus (see photo 2 above) persists through the winter within dead leaf tissue. Heavily infected leaves often wither and die. An EEO/AA employer, University of Wisconsin-Madison Division of Extension provides equal opportunities in employment and programming, including Title VI, Title IX, the Americans with Disabilities Act (ADA) and Section 504 of the Rehabilitation Act requirements. Disease development is dependent on moisture supply and temperature. Consider using daylily varieties (e.g., ‘Betty Bennet’, ‘Edna Spalding’, ‘Ella Pettigrew’, ‘Globe Trotter’, ‘Nancy Hicks’, ‘Pink Superior’, ‘Ron Rousseau’, ‘Sudie’, ‘Tropical Tones’, ‘Upper Room’, ‘Winsome Lady’) with reported resistance to leaf streak. Note below that the affected part of the leaf is the center midline vein then outward as the disease progresses. Spores produced on infected leaves lead to additional infections. Races of the pathogen exist; therefore, disease may still occur on these varieties. Pathogen cycle: The fungus (see photo 2 above) persists through the winter within dead leaf tissue. While robust, there are some issues that may cause these plants to struggle in the garden. These spots often have an orange coloration, leading people to suspect daylily rust. As your daylily plants grow, divide them into smaller clumps and replant them with ample space between clumps. The disease is most common in warm, wet weather. Feedback, questions or accessibility issues: © 2020 The Board of Regents of the University of Wisconsin System. In some cases however, leaf streak can cause substantial leaf loss, and rarely it may lead to complete defoliation of daylily plants. Avoid over-head irrigation. Symptom of Daylily Leaf Streak              2. Plant to plant spread can also occur when people or animals move through wet foliage. Symptom of Daylily Leaf Streak 2. Day Lilies' Diseases and Their Cures. Remove infected leaves as they appear, and fertilize and water your plants properly to promote growth of new leaves. We teach, learn, lead and serve, connecting people with the University of Wisconsin, and engaging with them in transforming lives and communities. Varieties vary markedly in their resistance. The 2006 North Carolina Agricultural Chemicals Handbook also lists mancozeb and thiophanate-methyl products. Remove dead leaves from your daylilies each fall to eliminate a source of the leaf streak fungus. A. Leaf streak symptoms often initially appear as yellowing that begins at leaf tips and spreads down along and outward from the midveins of leaves. As the disease progresses, complete leaf death can occur. Leaf streak is caused by the fungus Aureobasidium microstictum. Red-brown flecks may also be a symptom of leaf streak. This tissue eventually browns and dies. Management: Wider spacing of plants to increase air circulation and management of overhead irrigation will aid in control by allowing leaves to dry. Spores, which cause additional infections, are produced in the necrotic tissue. 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