For more information on daylilies visit the AHS website. However, as easy as they are to care for, daylilies do have a few problems that can result in damage or death to your plants. Daylilies are some of the toughest flowers around, but if you’re concerned about daylily plants in winter, digging and storing daylily tubers isn’t a bad idea, especially in climates north of USDA plant hardiness zone 5. Other bad bugs, like aphids and spider mites, are very small and hide deep down in the leaves. Daylily problems used to be rare, but during the past 10 years daylilies have been affected by two new fungus diseases, one serious (rust) and one not so serious (streak). The pathogen is a fungus called Aureobasidium microstictum. Like; Save; Related Discussions. If dividing plants, let wounds air-dry prior to re-planting. To the untrained eye, daylily rust looks a lot like streak, but they are different diseases, and rust is the more serious one: Read more >>>, Go from Daylily Problems back to Daylilies, Copyright © 2020 Flower Gardening Made Easy. Daylilies have their own specific aphid which feeds only on daylilies. These pests are typically active in cool weather in temperate zones and during the winter months in the subtropics. You may not know that they are there until your plants don’t look so good any more. Believe it or not there are good bugs that come to your daylilies to eat too but not to eat them but to eat the bad bugs. Avoid the diploid wild species. Daylilies require very little care and are ideal for the gardener wanting low-maintenance flowers. The pathogen is a fungus called Aureobasidium microstictum. In the spring, spores are active during wet, humid weather and new leaf growth is infected as it emerges through the past season’s dead leaves. However, cold damage following shoot emergence is not a reason. The name is appropriate, since each flower lasts only one day. The entire plant begins to look brown and sick after flowering, and the leaves wither and die. The fungus responsible for the rust is Puccinia hemerocallidis and will appear as orange-yellow powdered specks on leaves and scapes. The daylily aphid (Myzus hemerocallis) is a small, white to green, soft-bodied insect with piercing and sucking mouth parts. Look at plants in public gardens and around your neighborhood. The triploid Hemerocallis fulva is the yummy one (for most people). provide blooms for several months. Fungus is the cause of some diseases that affect daylilies including daylily rust. During the day, slugs and snails hide in cool, damp places like in dead foliage, mulch, or under rocks and bricks. You may or may not notice a foul odor with these diseases. Click this article to learn what to do with daylilies in winter. This spore cycle continues all summer. Look for plants with complementary colors to add to your existing selections. If your plants are overcrowded, divide them in spring. You must also avoid over or underwatering plants and over-fertilizing or amending with organic materials that are high-water retentive. Designed by Elegant Themes | Powered by WordPress. They grow in close groups, so it often looks like there are a large number of leaves. Several indications that your daylily could be suffering from crown or root rot include plant yellowing and collapsing, leaves are easily pulled out, soft tissue, or plant death. Although some diseases are simple for the home gardener to recognize, others are more difficult, including crown and root rot. Aphids. According to AHS, spring sickness occurs in early spring with daylilies showing discolored, twisted, bent, or stunted foliage on some of the daylily’s fans. Even if the rust causes leaves to die back the plant itself should survive. These may even require a professional laboratory diagnosis. Save my name, email, and website in this browser for the next time I comment. Control methods include sanitation and pesticides specific for snails and slugs. Snails and slugs are known to feed at night on young tissues of daylilies, causing torn edges and holes. How the disease spreads: The fungus overwinters in the plant’s dead leaves. Although some types of daylilies are evergreen throughout the winter, many normally die back in the fall. We wanted to take a closer look at the most significant issues with growing daylilies. There are some fungicides available to treat your plants. Fortunately, daylily streak, the less serious of the two diseases, is the one you are most likely to run into. We have not noticed any bud or bloom damage from this Rust Fungus. The bad news, daylilies have an aphid that is specific to the flower and unlike typical garden aphids, are not easily controlled with agents such as soaps. Overcrowded plants tend to develop disease symptoms earlier in the season. Summer-flowering day lilies (Hemerocallis spp.) Fungicide products that contain sulfur, azoxystrobin (Heritage) or chlorothalonil (Daconil or Pathguard) applied in the spring can help to protect new foliage from infection. We wanted to take a closer look at the most significant issues with growing daylilies. The best control method is using a Kelthane free pesticide that has either a long residual or systemic action and is applied early in the growing season.