Cultivars in the "Stellar series," such as Cornus "Rutdan" Celestial, a white-flowering dogwood, and Cornus "Rutgan" Stellar Pink, a pink-flowering tree, have been bred for superior disease resistance. Bark normally develops puzzle piece pattern, that is part of the appeal. You can control aphid infestation fairly easily if your trees small enough to get at. This watering problem is really a universal issue. Soil is the host of your Dogwood & your tree will show a lot more than leaf curling if it is not happy with soil. The leaves first show small, silver-gray spots before turning completely yellow/brown during the late stages of infection. It will grow about the same size as a flowering dogwood of 15 to 30 feet tall and wide but they are slow growing, only growing about 10 feet in 15 years. If the tree drops its leaves early this year but the branches arent brittle, continue to care for it through the rest of the year and see how it looks next spring. Leaf Scorch and leaf roll result from stress. white powder on fiddle leaf fig leaves- mildew or hard water stains. I would suggest a well-set drip irrigation system for your garden. Hands-On Gardening 2023. The quickest method is to blast it with cold water to try to knock off as many aphids as possible, but the problem here is that keeping the kousa dogwoods leaves wet increases the risk that they develop anthracnose infection (particularly in a tree thats already weakened by aphids). trees often develop unattractive leaf curling throughout canopies during hot and/or dry weather. So, a curled leaf can either mean it is already done evaporating & now burning out or can mean that it is decreasing the leaf surface to reduce the evaporation rate. Light: Full sun to partial shade. If ants are farming your aphids, apply a sticky barrier on a 4 inch-wide band of masking tape around the dogwood's main branches or trunk, 2 to 4 feet from the ground. However, rainy seasons are best for fungal attacks. Propagating 'Wolf Eyes' Dogwood. If the soil gets dry easily, cover the root area with accurate mulch. Low-maintenance shape. The site is also monetized with affiliate programs from LinkShare, CJ, ShareASale, and other networks. Hi Sandy, if your soil is decently well-drained, it would be almost impossible to overwater during the first year. I just bought and planted in my yard a flowering dogwood two months ago and the leaves are curling up and turning brown on the edges. Whats going on? Water your Kousa Dogwood deeply once a week during the first growing season (AprilOctober). This is a really common fungal infection called powdery mildew. Not only this, but aphids also lure ants to the party. Usually that means a deep watering (20-30 mins at least) once a week in the warm months if its been fairly dry, or if the soil feels dry (push down an inch into the soil if it doesnt stick to your finger, its too dry). After that, I tried to find out why the Dogwood tree shows leaf curling. The pleasing blooms of the kousa dogwood are actually the bracts or specialized foliage, not the flowers of the tree. Leaf and flower blight. Anything that can provide shade can be helpful for the tree. Make sure the soil has the right amount of nutrients in stock. I have a background in science and education, but love to get hands-on experience when it comes to nature, making my own gardening mistakes and learning from them! Sever the remaining leaves in half, but leave them on the cutting. This site also participates in other affiliate programs and is compensated for referring traffic and business to these companies. Measure the soil pH & if the range is between 5.5-6.8, then it is okay. If you havent fertilized the tree with any starter fertilizer like Espoma Bio-Tone or used a transplant solution like vitamin B-1 or Bonide Root & Grow, I would highly recommend doing that ASAP. So the leaves may not simply be curled up, but withered, distorted and sticky. Leaf curl on dogwoods is essentially a protective reaction to stress the tree feels. So, in both cases, Dogwoods dont get enough water. Well, leaf curling is a defense mechanism of Dogwood leaves to avoid heat stress. fall Usually, though, dogwoods will adapt very well to any location after a few years, so dont worry too much if your new tree looks stressed. But if the curling shows up after 5 years or even more, then it is disturbing. Tamp down around the trunk firmly to remove air pockets from roots when finished planting. She is also a former mortgage acquisition specialist for Freddie Mac in Atlanta, GA. From your photos it appears your dogwood has Leaf Scorch. Could this be related to the damage or the heat waves this year? During times of drought water every 7 to 10 days. are known throughout U.S. Department of Agriculture plant hardiness zones 2 through 9, depending on species. Avoid planting during the hot summer months (June August ). The application rate is 2 teaspoon mixtures per liter of water. Doing this will help you decide if your tree can benefit from a general fertilizer or if it needs a fertilizer that is aimed towards a specific nutrient. But dont worry. I planted it last fall in part sun/shade with open sky above it. The most common issue with kousa dogwoods. Sign up today and receive a coupon for $5.00 off your next purchase of $50 or more! Hanging baskets It should be okay next year. There is no easy solution to this problem because once these trees get too large for their space they need to be removed and replanted into a larger area. These diseases are fungi that prosper in cool, wet weather and infect leaves as soon as they open in spring. I'm Al. As the disease progresses, the leaves may cup or curl upward. Moss Control It is characterized by purple spots on bracts and leaves in spring. You can also reduce the risk of fungal leaf spot infections by. Some leaves have started to turn red already. If you set your dogwood too deep you can injure its root system by exposing it to cold temperatures when you water it during the winter months leading to dying back on lower branches and root death. The genus name, Cornus, is Latin, from the word, cornu, which means "horn." This . The best way to control Verticillium wilt is by planting Kousa Dogwoods in raised beds with good drainage and deep loamy soils that are not compacted. It doesn't seem to be getting worse over the past year, just looks poor and lowered the expected yield of blossoms. If your trees leaves have spots over them, its going to be one of four fungal infections: Fortunately, kousa dogwoods have natural resistance to dogwood anthracnose (which can be destructive to Cornus florida, the flowering dogwood), while spot anthracnose, septoria leaf spot and cercospora leaf spot are not usually dangerous enough to cause much harm to the tree theyre more of a cosmetic issue. Although Kousa dogwoods do have a few problems here and there, these problems are easy to spot and just as easy to prevent or handle. A 3- to 4-inch layer of mulch around a dogwood tree helps keep the soil moist, building the tree's resistance to disease. Some Kousa's droop and curl more than others, it depends on the cultivar. Why are my Kousa Dogwood leaves turning yellow? They are not dryit looks like a willow? Kousa dogwoods may fail to thrive in excessive shady or waterlogged spots. All Rights Reserved. If leaves are very young when infected, they can become curled and distorted with only a portion of each leaf dying. Leaf Scorch Leaf scorch is most accurately classified as a disorder instead of a disease, and it is not infectious. Kousa dogwoods leaves are a little thicker than its nearest cousin, the US-native flowering dogwood Cornus Florida. These compact landscape plants are favorites of gardeners for their ease of care, but can develop cupping leaves in response to common troubles, reports the University of California Statewide Integrated Pest Management Program. Parsley Seedlings Turning Yellow: How to fix this? There are very few flowering understory trees as attractive as a dogwood tree. curling leaves on Kousa dogwood, fungal infection? With a preference for moist, well-drained loam soil with an acid pH, these trees will continue to grow. Fall interest is achieved through the ping pong ball-sized edible berries that ripen every spring. You've only seen one page. Amazon.com Disclosure: As an Amazon Associate I earn from qualifying purchases. Clean your pruners with rubbing alcohol or alcoholic hand sanitizer to sterilize them between cuts. [Solutions], Dogwoods do best in partial sunlight. Les Engles achieved Master Gardener through theCamden County Extension of the Rutgers Master Gardeners Program. Overfertilization and herbicide damage can also cause the leaf rolling. Most likely it will be finebut I understand your concern! Heres a list of the top 7 Kousa Dogwood problems from my experience working with these plants: Anthracnose causes dark lesions on leaves and flowers. I think the curled leaves reflect how much sunshine it gets. Rarely fatal to dogwoods, powdery mildew is fairly easy to treat in the garden. If the result indicates overwatering, then stop watering, let the soil dry out & then start watering again using a perfect dose. Both over-watering & under-watering are not suitable for Dogwood. Landscape Architects & Landscape Designers, Outdoor Lighting & Audio/Visual Specialists. Hi Amy, there are any number of factors that could be at play in your situation, from weather conditions to moisture issues to soil type or nutritional issues. Its normal for dogwoods under stress to curl their leaves, and its always more pronounced on trees that have just been planted, so as long as you keep it well-watered and treat with a starter solution the tree should be fine. annuals Unfortunately, sunlight is something that you dont control. Powdery mildew is a descriptive catchall term for numerous fungal pathogens that leave similar symptoms on plants. Learn which plants thrive in your Hardiness Zone with our new interactive map! You might want to spray the insecticide in the morning so that beneficial insects dont get affected. However, my memory may suck, but Dogwoods still fascinates me like crazy. Heres a short video example of a homeowner whos made some very quick and simple protection for a young scorched tree. In severe cases, fungicides may be required but only every other year should you see such a need for their use. The leaves have curled and are turning brown at the tips. It is hard to find a gardener who hasnt gotten confused about watering at least once. Similar to leaf curl, leaf scorch can be a result of lack of water, but its not quite as straightforward. Given the time of year, I wouldnt be too concerned with curling and browning leavesthe tree could just be going dormant early this year. In drought, they undergo leaf curling, also caused by aphids, and leaf scorch. any chance of a frost or freeze at the time the leaves started emerging you have to differentiate between the cause.. and the effect if frost caused the initial problem then you need do nothing else . if the damaged leaves.. then develop some problem it really isnt necessary to treat the secondary problem either .. most trees can reflush at least once after a severe frost.. without any long term problems did you have a horrible winter ??? Lets see how Dogwoods react against high heat. Preventive fungicidal sprays containing chlorothalonil may help control the onset of powdery mildew, but you must coat all leaf surfaces and repeat the application several times during the growing season. Using insecticide beforehand is the best thing that you can do. So, keep an eye on the weather update & also keep following the watering schedule. Curling can be infestation or heat and drought. Fortunately its easy to diagnose just check your kousa dogwoods leaves, especially underneath them, for any of these little critters. Kousa dogwoods dry out easily because they have a shallow root system. Boy oh boy was he excited to see that. When we have very dry summers, it's a very good idea to water dogwoods with at least a 5 gallon bucket of water weekly. Though the Cornus kousa is not considered drought-tolerant, it is more resistant to drought than native flowering dogwood. Environmental disorders and infectious diseases may cause dogwood's leaves to cup and curl, and can threaten the tree's health wherever it grows. Dogwoods are highly susceptible to Powdery Mildew & Anthracnose. If possible, place it in a location that will receive morning sun and afternoon shade. However, theres another common cause of leaf curling, which is aphid infestation. Some leaves also develop some fairly large brown spots on the leaves. 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