How do you treat leaf streak on daylilies

Megan Meyers* and Brian Hudelson, UW-Madison Plant Pathology Revised: 4/24/2014 Merchandise quantity: XHT1235

What’s leaf streak? Leaf streak is a typical illness of daylilies, affecting daylilies wherever they’re grown. Daylily varieties can range broadly when it comes to their susceptibility to the illness. Oftentimes leaf streak is a beauty drawback, inflicting little injury. In some circumstances nevertheless, leaf streak could cause substantial leaf loss, and infrequently it might result in full defoliation of daylily crops.

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What does leaf streak seem like? Leaf streak signs typically initially seem as yellowing that begins at leaf ideas and spreads down alongside and outward from the midveins of leaves. This tissue ultimately browns and dies. Purple-brown flecks might also be a symptom of leaf streak. These flecks enlarge, flip brown and grow to be surrounded by yellow halos. Because the illness progresses, full leaf demise can happen

The place does leaf streak come from? Leaf streak is brought on by the fungus Aureobasidium microstictum. This fungus overwinters in infested daylily leaf particles the place it produces spores that provoke the illness every spring. Spores produced on contaminated leaves result in further infections. The illness is commonest in heat, moist climate.

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How do I save a plant with leaf streak? Take away contaminated leaves as they seem, and fertilize and water your crops correctly to advertise progress of recent leaves. DO NOT water with a sprinkler. This may unfold the leaf streak fungus, in addition to moist leaves, creating situations extra favorable for an infection. As an alternative, use a soaker or drip hose to use water immediately into the soil. To additional restrict pathogen unfold, keep away from working with crops when they’re moist.

How do I keep away from issues with leaf streak sooner or later? Take away lifeless leaves out of your daylilies every fall to eradicate a supply of the leaf streak fungus. Burn (the place allowed by native ordinance), deep bury or scorching compost this materials. As your daylily crops develop, divide them into smaller clumps and replant them with ample area between clumps. This can enhance air circulation and promote extra speedy drying of leaves. Think about 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. Have in mind nevertheless that even resistant varieties could not carry out effectively yearly and below all environmental situations. If you develop daylily varieties that endure from extreme leaf streak yearly, think about making use of fungicides containing chlorothalonil, mancozeb or thiophanate-methyl to stop the illness. Use fungicides solely during times of moist climate. Begin functions earlier than you see signs and treat each seven to 14 days so long as moist climate persists. DO NOT use the identical energetic ingredient for all therapies. Alternate using a minimum of two energetic elements to assist reduce issues with fungicide-resistant strains of the leaf streak pathogen. Make sure you learn and observe all label directions of the fungicides that you choose to make sure that you use them within the most secure and best method attainable.

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