Rainy periods and overhead irrigation increase infection and enhance symptom development, since spore dissemination occurs naturally by splashing water. Management: Wider spacing of plants to increase air circulation and management of overhead irrigation will aid in control by allowing leaves to dry. The 2006 Georgia Pest Management Handbook lists Daconil 2787 and Daconil Ultrex. Symptom: (see photo 1 below) Initial symptoms consist of leaf spots which often form along the mid-vein. 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. As your daylily plants grow, divide them into smaller clumps and replant them with ample space between clumps. Burn (where allowed by local ordinance), deep bury or hot compost this material. Use fungicides only during periods of wet weather. Where does leaf streak come from? The 2006 North Carolina Agricultural Chemicals Handbook also lists mancozeb and thiophanate-methyl products. Heavily infected leaves often wither and die. (Photo courtesy of Doug Maxwell), Megan Meyers* and Brian Hudelson, UW-Madison Plant Pathology Revised:  4/24/2014 Item number:  XHT1235. Mycelium of Aureobasidium microstichum. Daylily plants are among one of the most popular perennial landscaping flowers. Daylily varieties can vary widely in terms of their susceptibility to the disease. Leaf dieback symptoms follow and usually develop from the leaf tip downward. Daylily problems – streak 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. 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. Instead, use a soaker or drip hose to apply water directly into the soil. It is important to start sprays at emergence of new growth. Keep in mind however that even resistant varieties may not perform well every year and under all environmental conditions. Note below that the affected part of the leaf is the center midline vein then outward as the disease progresses. 1. These are more angular and elongated than those formed by rust. Daylily leaf streak may be avoided by purchasing disease-free stock plants and propagating only from healthy specimens. Mycelium of Aureobasidium microstichum. This tissue eventually browns and dies. Fungus is the cause of some diseases that affect daylilies including daylily rust. DO NOT use the same active ingredient for all treatments. DO NOT water with a sprinkler. What is leaf streak? 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. ... Another disease resulting from a fungus (Aureobasidum microstictum) is leaf streak. Avoid purchasing plants with any symptoms of the disease. This fungus overwinters in infested daylily leaf debris where it produces spores that initiate the disease each spring. Oftentimes leaf streak is a cosmetic problem, causing little damage. There are formulations of these products and/or active ingredients registered for use in South Carolina. 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. Streak disease after daylilies have bloomed. Daconil 2787 can be used by home gardeners. Remove and destroy dead leaves after the first hard freeze. Feedback, questions or accessibility issues: © 2020 The Board of Regents of the University of Wisconsin System. To further limit pathogen spread, avoid working with plants when they are wet. Leaf streak symptoms often initially appear as yellowing that begins at leaf tips and spreads down along and outward from the midveins of leaves. The pathogen is a fungus called Aureobasidium microstictum. While robust, there are some issues that may cause these plants to struggle in the garden. Leaf streak is caused by the fungus Aureobasidium microstictum. Oftentimes leaf streak is a cosmetic problem, causing little damage. As the disease progresses, complete leaf death can occur. How do I avoid problems with leaf streak in the future? Remove dead leaves from your daylilies each fall to eliminate a source of the leaf streak fungus. This can spread the leaf streak fungus, as well as wet leaves, creating conditions more favorable for infection. We teach, learn, lead and serve, connecting people with the University of Wisconsin, and engaging with them in transforming lives and communities. Pathogen cycle: The fungus (see photo 2 above) persists through the winter within dead leaf tissue. Daylily leaf streak, for instance, can cause distress. Susceptibility varies among cultivars. Symptom of Daylily Leaf Streak              2. What does leaf streak look like? When temperatures are above 90F, disease development slows. Of overhead irrigation increase infection and enhance symptom development, since spore occurs. 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