Marjan Kluepfel, Former HGIC Horticulture Information Specialist, Clemson UniversityJanet McLeod Scott, Former Horticulture Information Specialist, Clemson UniversityJames H. Blake, EdD, Extension Associate/Adjunct Professor, Dept. Daylily Rust: Daylily rust is caused by the fungal pathogen Puccinia hemerocallidis. As much as possible, these predators should be allowed to reduce aphid populations. For those problems for which there is detailed information in a different part of Yardener’s Helper, the name of the problem is linked to a detailed file. In addition, using insecticides means that beneficial predators will also be killed. If a single aphid survives, a new colony can be produced in a short period of time. Aphids: Various aphids can be pests on daylilies. Their feeding can result in deformed leaves and small warty growths on flower buds. If serious damage is occurring, insecticidal soap or spinosad sprays are recommended. See Table 1 for examples of brands and products. Star Gazer Lilly Heads Droop And Leaves Turn Black, Daylily Buds Eaten By Deer Will New Buds Form And Bloom This Season, Daylily Flowers Are Not The Expected Color, Daylily Crowns Have Yellow Brown Leaves At Base, Marigold And Daylilly Flowers Being Eaten, Daylily Flowers Are Being Cleanly Cut Just When Starting To Form, Daylily Flowers Are Not Showing Above Leaves, Day Lillies Are Getting Smaller Every Year, Will Soap Or Ladybugs Help Potted Day Lillies That Had Aphids And Now Have Deformed Leaves With Brown Edges. Common... Bacterial Soft Rot. For more severe infestations, bifenthrin, cyfluthrin, lambda cyhalothrin, or permethrin sprays will control aphids. Early flowering daylilies are typically the most heavily infested and egg-laying may have ceased by the time later flowering daylilies … Insecticides that will control this leafminer are imidacloprid sprays or plant drenches, acephate sprays, or spinosad sprays. Mites are not insects but are more closely related to spiders. See Table 1 for examples of products. Two-spotted Spider Mites (Tetranychus urticae): The two-spotted spider mite and other mite species can be a problem on daylilies. Gently tip the paper to remove any bits of trash and then examine the paper in bright sunlight. Attach them to stakes and place near the daylilies. These spores can be wind-blown or disseminated by gardeners handling infected plants. Control: Spider mites overwinter (survive the winter) on weeds, such as chickweed. If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988. Flower thrips are small, dark-colored insects that suck sap from the plant by scraping into the surface of plant cells. Both adults and nymphs (immature insect stage resembling the adult, but smaller) feed by scraping surface cells to suck plant sap. Clemson University – USDA Cooperative Extension Slide Series, Bugwood.org. Tips on how to use this sectionThe symptoms of the most common problems are in the left column of the chart. In the right column are the probably causes of those symptoms. of Plant and Environmental Sciences, Clemson UniversityClyde S. Gorsuch, PhD, Emeritus Faculty, Entomology, Clemson University, Joey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. Clean up and dispose of all dead foliage at the end of the season, as this will help reduce over-wintering of the pupae, as well as reduce the spread of foliar diseases, such as daylily leaf streak disease. The bacteria that cause rot are normal soil inhabitants. Disease development is favored by high temperatures, poor air circulation, poor soil drainage and improper fertilization. Mites are not insects but are more closely related to spiders. They feed on leaves and flower buds by inserting their mouthparts and sucking plant sap. These pustules produce the yellowish-orange urediniospores that spread to infect additional daylily foliage. Two-spotted Spider Mites (Tetranychus urticae): The two-spotted spider mite and other mite species can be a problem on daylilies. Spray with spinosad as soon as symptoms of mining are noticed. To aid in control of daylily rust, plants may be sprayed with propiconazole, myclobutanil or chlorothalonil. To help with your bud blast care, the most common environmental problems are listed below, along with solutions for treating bud blast: Improper Watering – Improper watering causes a great deal of stress to many plants. Slugs & Snails: These can be a problem on daylilies, especially in the early spring when they feed on tender young growth. Daylily leaf streak may be avoided by purchasing disease-free stock plants and propagating only from healthy specimens. With a light infestation, their feeding causes leaves to have silvery speckles or streaks. Apply environmentally safe snail and slug baits (containing iron phosphate) near the beds. Soft Rot: Pectobacterium carotovorum causes bacterial rot at the base of the flowers and in the rhizomes. Because of the evident plant root galling by the root-knot nematode, entire plant samples should be submitted, not soil samples for assays as for other soil nematodes. Meg Williamson, ©2015 Clemson Plant and Pest Diagnostic Clinic. See Table 1 for examples of brands and products. The symptoms are very similar to those of daylily leaf streak: yellow to brown streaks on the leaves along with numerous, small yellow spots. The small pale-yellow larvae then feed within the leaves in meandering mines that become wider as the larvae grow. The whitish mines remain visible throughout the life of the leaf, which makes infested daylilies unmarketable. For those problems for which there are no additional files, the discussion is found in the paragraphs below the chart. With a light infestation, daylily leaves and flowers develop yellowish speckles. In the fall, remove dead foliage from around the base of daylily plants and dispose of the clippings. With a heavy infestation, the speckles will run together and entire leaves can become bleached and die. 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. Over-wintering occurs either near the base of the leaves or at the base of the plants. Damage in BC is evident between April and July depending on location. More information on control of slugs and snails and the safest baits is available in HGIC 2357, Snails & Slugs in the Home Garden. As with any pesticide, read and follow all label directions and precautions. With severe infestations, leaves and flowers are stunted and distorted and may turn brown and die. The feeding activities of the larvae inside the buds cause abnormal bud development and these buds … See Table 1 for examples of brands and products. Control: Several naturally occurring enemies feed on aphids, including green lacewings and ladybird beetles (ladybugs). Sprays to control the leafminer may affect natural predators and parasites that can reduce the numbers of leafminers. Joey Williamson, ©2015 HGIC, Clemson Extension. Sampling: As a result of their small size, thrips are difficult to detect before damage is obvious. Examples of resistant daylily cultivars include: Betty Bennet, Edna Spalding, Ella Pettigrew, Globe Trotter, Nancy Hicks, Pink Superior, Ron Rousseau, Sudie, Tropical Tones, Upper Room, and Winsome Lady. Reports indicate that in some cases clumps may be so badly affected that few buds open normally. To sample for mites in your daylilies, follow the same procedure discussed in the thrips section above. The best option is to choose plants that are not susceptible to the root-knot nematode. Sampling: Like thrips, spider mites are very small and are difficult to detect before damage is obvious. They are very small, less than 1 / 50 -inch long. Maggots develop inside daylily flower buds causing them to become inflated, distorted and unable to open properly. However, be aware that some nutrient deficiencies cause streaking in leaves and flowers. If rust-infected foliage is wiped with a white tissue, the spores will rub off and are visible as a yellowish-orange stain. Daylily leaf streak is caused by the fungal pathogen Aureobasidium microstictum. Paint cardboard or wooden boards blue and then coat with petroleum jelly. The infected leaves may wither and die completely. Bacterial soft rot, also known as crown rot, is caused from damaged roots or crowns and occurs in... Slugs and Snails. Recovery and normal blooms occurring that season are uncertain. 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