This species thrives in USDA zones 5-8 and seems to do well at zone extremes, both cold and warm, rather than at temperate areas. A: It's a 'Wolf Eye' kousa dogwood, one of my favorites. Powdery mildew typically appears on new growth in the spring and fall, but it can also occur again later in the summer. Controlling aphids often means ridding yourself of the ants that are protecting them from their natural enemies as well. 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 ??? Seeds Why Does a Pear Tree Have Small Leaves & Sparse Leaves? Step-by-step solution guide, Flowering dogwood lacking flowers why (and can I fix it? Read more in about how to water your kousa dogwood tree in this article. It can be used as a specimen plant or in shrub borders. Drying wind is a combination of high air temperature, low relative humidity & high wind velocity. Kousa dogwoods dry out easily because they have a shallow root system. Once your Dogwood gets affected by aphids, it is better to spray with an ideal insecticide (our pick: Monterey organic Garden Insect Spray). The fall foliage is also beautiful, turning a striking maroon or reddish-purple in late autumn. Dig a hole that is twice as wide, but not quite as deep as the root ball. Additionally, you can spread bark mulch around the base of the tree to keep the soil from drying out. I see no signs of insects on upper or lower leaf surfaces. This common landscape fungus is highly visible on new growth, which are covered in white spores before wilting and browning by late summer. This disease causes a white, powdery coating on upper leaf surfaces. A 3- to 4-inch layer of mulch around a dogwood tree helps keep the soil moist, building the tree's resistance to disease. Chinese dogwood (C. kousa): some cultivars, Flowering dogwood (C. florida): many cultivars, . Summer Thanks for your question! This will help reduce the chances of damage to the rootball to temperature fluctuations below/above the ideal range. Other dogwood diseases, such as those caused by Septoria cornicola species pathogens, may also show leaf-spotting symptoms similar to anthracnose, but they do not cause cupped or curled leaves. Make sure the soil has the right amount of nutrients in stock. Found out that improper sunlight, watering problem, pest attack, etc are the main reasons behind this. Dogwood trees adapt quite well in any location. 6 Common Branson Tractor Problems (+ How to Fix Them), When Do Azaleas Bloom? Maybe some fencings needed. Pyrethrin is probably the most frequently used. A more attainable goal is to manage the environmental influences that favor the disease. They are flatter in shadebut the tree doesn't flower as well in shade. Soil The kousa will thrive in rich soils with plenty of organic materials that are consistently moist but not wet. Unique plants Just be a bit careful with your dogwood trees and get gifted with beautiful spring or early-summer blooms. Q: Why does my dogwood have curled leaves? In drought, they undergo leaf curling, also caused by aphids, and leaf scorch. The site is also monetized with affiliate programs from LinkShare, CJ, ShareASale, and other networks. Make sure there are no rocks at the bottom of the hole. Trees with shallow root systems benefit from a few inches of mulch to moderate the soil temperature. Save my name, email, and website in this browser for the next time I comment. Using insecticide beforehand is the best thing that you can do. Now, you may ask which type of soil fails to provide the requirements. This is actually one of its attractive characteristics and makes the kousa dogwood a particularly interesting sight in winter. Jack's Classic Affected leaves turn yellow or brown along the edges and curl due to water stress, sunburn, inadequate mineral intake, high soil salinity and drying winds. As with powdery mildew, the mainstay of these conditions is cultural control gardening hygiene, by which we reduce fungal spores, and further spread. That means they know how to handle cold weather! Thank you! An attractive, readily available substitute has been found in Cornus kousa, the kousa dogwood. Given the time of year, I wouldnt be too concerned with curling and browning leavesthe tree could just be going dormant early this year. Could this be related to the damage or the heat waves this year? Branches grow upright when the tree is young, but appear in horizontal layers on mature trees. Planted a wolf eye dogwood in June and its now doing well. The functionality of the Cornus kousa is what makes the tree so appealing to professional and amateur landscape designers alike. I bought a Cornus Kousa 'Satomi' dogwood from the Seaside Dennis Seven Dees in September 2019. However, my memory may suck, but Dogwoods still fascinates me like crazy. I doubt that once-a-week watering would amount to overwatering, but with clay soil, its possibleespecially if that weekly watering is a very heavy soak. Why Dogwood Tree Leaves Are Curling? 3 above. Make sure youre giving them enough water so they dont wilt and become too susceptible to infestation. If your dogwood's leaves were covered in a white, powdery substance before they began to fade to light green or yellow and cup, powdery mildew is likely the cause of your dogwood problem. Controlling fungal attacks is not easy. Remember, while I like to get hands-on with trees and plants, you're responsible for your own decisions, and should always consult with a local expert. Sadly, many North American native dogwoods in the genus Cornus have become susceptible to the potentially fatal fungal disease dogwood anthracnose. Watering Further sunlight exposure causes burning of the dry leaves & eventually browning & more. Pruning, Perennials, and a Recipe for Mildew Stains. Consider adding a larger tree into your landscape nearby to offer partial shade. When you buy with our links, we may earn a commission. 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. Drought, heat stress, overwatering and soil compaction are possible problems. I suspect overwatering. Normally, aphid attack increases after rain. Hands-On Gardening 2023. The surrounding soil has a high clay content but I made the hole larger than necessary and after planting filled in with 50/50 mix of good loam and original soil. Outside of digging up a five year old transplant is there anything I can do for curled leaf besides what was already mentioned? Is there a disease or insect problem I should be worried about? Bulbs You can safely transplant trees later this fall once they start to go dormant, or early next spring before they leaf out. 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. Sometimes referred to as the Chinese dogwood, this Asian is a cousin to our native flowering dogwood. During hot weather, dogwood leaves may turn brown along the edges and between the veins, creating "leaf scorch." Drooping, reddening, and curling are additional symptoms . Once I made a painting of a Dogwood tree. Ideally, they should never be planted in the same area again if Verticillium wilt has been a problem in previous plantings; this is especially true when dealing with young plants or seeds of any kind. Kousa dogwood is a great choice of tree if you ask me. Aphids often show up with ants that protect them in exchange for the exudates (honeydew) that they secrete. Kousa dogwoods may fail to thrive in excessive shady or waterlogged spots. From your photos it appears your dogwood has Leaf Scorch. Protect sunburned trees by wrapping or whitewashing the trunk, or by installing a sun shade for smaller dogwoods. If you notice the leaves wilting, even though it is still early in the day or not as hot as normal for that time of year, make sure it has plenty of water. In severe cases, fungicides may be required but only every other year should you see such a need for their use. I suspect a fungal infection since the trunks of the poor leaves are mottled and have patches that look like lichen. fruit trees While its true that the rocks could be increasing the temperature of your soil, as long as youre watering deeply your tree should be fine. Dogwood Has Yellow Leaves - Other Issues So todays article is all about this. ), which thrives in U.S. Department of Agriculture plant hardiness zones 2 through 9. Hardiness: Kousa dogwoods are hardy to zone 5. During times of drought water every 7 to 10 days. Often, simply thinning the canopy is enough to destroy the fruiting bodies of this fungus. The tree was planted as a memorial and I dont want to lose it. What Is the Orange Sap Coming Out of a Dogwood Tree? (Not the month you think), How Far Apart To Plant Hostas (Explained), Why is Agapanthus Not Flowering? Water thoroughly after planting to settle remaining air pockets in roots & eliminate possible dry spots near trunk flare. Viral diseases that typically affect Kousa Dogwood plants include Cucumber Mosaic Virus (CMV), Raspberry Bushy Dwarf Virus (RBDV), and Verticillium Wilt (Vert). If you see the white coating and cupped leaves on your tree, fungicides cannot cure the disease, which is already established. Cornus kousa, commonly called Kousa dogwood, is a small, deciduous flowering tree or multi-stemmed shrub that typically grows 15-30' tall, with a vase-shaped habit in the early years but eventually maturing to a more rounded form. Landscape Architects & Landscape Designers, Outdoor Lighting & Audio/Visual Specialists. Its in a full sun location and its been really not this year so Im worried its not getting enough water. In drought, they undergo leaf curling, also caused by aphids, and leaf scorch. 3 Reasons for White Spots on Rosemary [Actionable Solutions], 5 Reasons Why The Orange Leaves Are Curling [How To Treat], Why Are The Leaves on Schefflera Turning Brown [Solution], 7 Best Fertilizer for Bougainvillea 2023 [Reviews & Guide], Why My Ice Plant Not Blooming: 6 Reason and Effective Solutions, Why Is Rattlesnake Plant Drooping? Also, avoid over-fertilization because this can reduce the plants natural immunity as well as leave it more vulnerable to infection from other pests/diseases. The fungus can survive for many years, so removing infected plants wont stop this disease from appearing again on your new Kousa Dogwoods planted within contaminated areas. But it isnt perfect you may have noticed that it isnt growing well, or that the leaves are discolored, curled up or spotted. Anthracnose affects many ornamentals. This disease can be caused by any number of things such as poor air circulation, wet plants, over-fertilization, and high humidity. Watered it everyday since planted in June . Due to the fiery sun, the leaves start to evaporate more water than regular & thus become dry by loosening their moisture content. Thanks for your question! Moss Control If your dogwood leaves are turning brown with dry crisp foliage and falling off, this can be because of less water in the soil. Though the Cornus kousa is not considered drought-tolerant, it is more resistant to drought than native flowering dogwood. These are symptoms of leaf scorch of dogwood. Kousa dogwood grows 15 to 20 feet tall and has beautiful exfoliating bark, long lasting flowers, good fall color, and attractive fruit. Both over-watering & under-watering are not suitable for Dogwood. It would be difficult to use too many Kousa . After a few years of establishment, they are well set in a garden. Insect Control All about blank filberts. Dogwoods get fungus just like rose leaves do. It should be okay next year. For Dogwoods, the soil has to be well-drained, and moistened but not soggy & slightly acidic. For Dogwoods, the soil has to be well-drained, and moistened but not soggy & slightly acidic. Fungal attacks are both problematic & irritating. If the browning is at the end (and sometimes the edges) of the leaves but the leaves arent otherwise spotted, your kousa dogwoods exhibiting a common sign of stress called leaf scorch. 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. 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. Avoid planting during the hot summer months (June August ). Generally, we dont feel too comfortable when a spell of drying wind passes through our locality, let alone our trees. 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! Thank you for this article! A sign of this is the leaves curling around their central vein. She founded Gaia's Farm and Gardens,aworking sustainable permaculture farm, and writes for Gaia Grows, a local newspaper column. Daily 6-8 hours of masked sunlight will not cause, First of all, check whether you are over or under-watering by using a moisture meter (, I would suggest a well-set drip irrigation system. Fortunately its easy to diagnose just check your kousa dogwoods leaves, especially underneath them, for any of these little critters. Captain Jack's Thanks for reading! Well, leaf curling is a defense mechanism of Dogwood leaves to avoid heat stress. So stay aware during that particular season. Thank you for your question! First of all, keep your garden & gardening tools clean. 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). for your garden. If caught early enough, simply remove all diseased leaves periodically throughout the growing season until no signs of leafminers are present. A variety of environmental stressors can cause an alarming curl -- known as leaf scorch -- in dogwood leaves. Its currently about 48 tall. Afternoon shade at the very least is preferred. Why are my Kousa Dogwood leaves turning yellow? There are also small clumps of leaves that appear to have a brownish color. On dogwood trees, Mycrosphaeria pulchra is the causal pathogen for powdery mildew. However, rainy seasons are best for fungal attacks. Plant your Kousa Dogwood from mid-fall through early spring (OctoberApril). I planted it last fall in part sun/shade with open sky above it. If lots of leaves are infected, you can get some defoliation (leaf drop). Soil: Kousa dogwoods do best in well-draining, moist rich soil that's not too heavy. Some species, such as the kousa dogwood (Cornus kousa; USDA hardiness zones 5 through 8), cup their leaves in response to adverse weather, but cupping leaves is a common problem for all dogwood species. 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. If your dogwoods have a white substance on the leaves and buds, powdery mildew may be the culprit. Curling can be infestation or heat and drought. Thank you! And finally, if the pH is not suitable, use slight sulfur to acidify the soil a little bit. It is 2 years old and has leave curl , i was wondering if the rocks are making the ground hotter and they should be removed so close to tree or does it mater, I am watering more and deeper. This will direct water straight down into the root system and alleviate stress. Since Dogwood is a tree, I recommend using a commercial insecticide but, if you want to use homemade formula, heres a recipe for you-. But its likely only to work if you can spray the entire tree if your kousa dogwoods more than 10 or 15 feet tall, you may need to tolerate a bit of aphid infestation. All Rights Reserved. This disease is caused by several species of fungi that attack plants by inserting their haustoria (feeding structures) deep into host cells to extract nutrients. Patches of gray mold grow on the patches if the weather remains very humid. If leaves are very young when infected, they can become curled and distorted with only a portion of each leaf dying. I would recommend using a plant starter solution on the treeone with IBA growth hormone would be best for quick root development. Hopefully, the solutions will come in handy for you. Common infestations include dogwood borer, powdery mildew, and fungal leaf spot diseases, particularly anthracnose. The best part is their resistance to pests and diseases. Secondly, treat your Dogwoods by applying fungicides from time to time. Since Dogwood is a flowering tree, the fungal attack is a great concern. Before fertilizing your kousa dogwood, it is a good idea to test your soil. Powdery mildew is encouraged by the high humidity levels that exist where plants are crammed in so tightly that air circulates poorly. Many scorch issues can be solved with a good application of organic mulch, such as bark chippings, around the base of the tree something many homeowners dont do but every arborist will tell you its important. Thank you! Direct overhead watering systems away from dogwood trees so the foliage does not stay wet, which allows anthracnose to breed and spread. In the case of Powdery mildew, a white powdery substance on the leaf surface is the trademark & an upward leaf curling occurs eventually. Leaves look as if they have a white coating, and can go on to become shriveled, yellow or brown, and fall off early. Sign up today and receive a coupon for $5.00 off your next purchase of $50 or more! are known throughout U.S. Department of Agriculture plant hardiness zones 2 through 9, depending on species. She came to gardening young, growing up on a farm with robust vegetable plots and flower gardens, and hasn't really stopped mucking about with plants since. Boy oh boy was he excited to see that. Kousa dogwoods again seem to have some resistance to this infestation, but theyre more at risk if the bark becomes damaged. You've only seen one page. You can prevent this disorder by planting trees in partial shade and keeping the soil moist, but not waterlogged, particularly during hot weather. Dogwood borer is unlikely to cause lethal illness in kousa dogwoods, but it can be controlled with insecticide, which is applied to the trunk over the summer months. Though success is not assured, most dogwoods can be propagated by taking stem cuttings and rooting them. Water: Average water needs, but will require irrigation during a drought, especially if planted in full sun. The kousa dogwoods only real drawback is that it is not native, but this is offset by knowing that it does still play a part in the native ecosystem by hosting the spring azure, a North American native butterfly. Its underwatered which might show itself in leaf-curling see below. I know a lot about kousa dogwoods (Im a bit of an enthusiast, I admit it), so Im here to help ordinary folk work out whats going on and what they can do about it. Overwatering, or soil that is always waterlogged (preventing strong root development), Root limitation where there is too little soil area for them to adequately grow outward, Be sure to carefully collect any leaves you prune off, and put them in the trash dont throw them on the ground, where their spores can spread. In severe cases, systemic fungicides may be required this should only happen every other year. Tolerates both drought and heat. I use no chemicals in my yard and feed it only with compost and peat moss. 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. Kousa dogwoods are native to eastern Asia and can be found growing in Japan, China, Korea, and Vietnam. Overwatering can lead to plant rot so remember to check on your plant before you turn on the hose! We live in Tri-Cities, Washington. The scorch is caused when evaporation of water from the leaves exceeds absorption of water by the roots. The best way to prevent leafminers is to monitor for their presence early in the spring before they do any harm by checking the undersides of new growth for larvae activity. This is probably the most common problem in the gardening world, yellowing leaves. Throughout the whole year, you may have noticed that summer is the time when Dogwoods show maximum leaf curling. The lesions start as small purple/brown spots before expanding into large dead areas where leaf edges turn brown and crispy. Young leaves that are infected are commonly distorted by cupping and curling. To make it well-drained, add some compost or organic matter to the soil. 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. Without further ado, lets dive into it. Follow with the spray every 7 to 14 days until all the leaves have opened. If the problem persists insecticidal soap might be needed, but only early on in the season should it become an issue. The tree gets plenty of water but I doubt the roots stay wet. Although leaf scorch is rarely fatal to a dogwood tree, it may weaken it. Try Pennsylvania Cooperative Extension Service. If you've opened the canopy and powdery mildew persists, try spraying your dogwood with neem oil concentrate, mixed at a rate of 2 tablespoons per gallon of water. This insect is typically more of a pest of ornamental plants rather than fruit-bearing ones, but it can cause damage to fruit trees as well. After a few years of establishment, they are well set in a garden. If possible, place it in a location that will receive morning sun and afternoon 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. I even got a prize for that but cant really remember whether it was white-flowered or red-flowered. Kathleen Miller is a highly-regarded Master Gardener and Horticulturist who shares her knowledge of sustainable living, organic gardening, farming, and landscape design. There is plenty of air circulation. Aphids are tiny, sap-feeding insects that plague landscape plants. Get daily tips & tricks to help make your best home, How to Grow and Care for Pink Dogwood (Seeds or Trees), 25 Types of Evergreen Tree to Add to Your Yard, How to Grow and Care for Doublefile Viburnum Shrubs, 9 Great Spring-Flowering Trees and Shrubs, Bunchberry Shade Ground Cover for Native Plant Landscaping. When you see your dogwood tree leaves turning yellow because of chlorosis, make sure you are watering appropriately. But cant really remember whether it was white-flowered or red-flowered sulfur to acidify the soil a little bit Dees. 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Fungicides can not cure the disease still fascinates me like crazy the requirements leaf dying last in... But only every other year should you see the white coating and cupped leaves your... Tree, the fungal attack is a combination of high air temperature, relative... In a location that will receive morning sun and afternoon shade suspect a fungal infection since trunks. Recipe for mildew Stains and soil compaction are possible Problems gardening tools clean purple/brown spots before into... Was already mentioned Issues so todays article is all about this it would be difficult to use many... My yard and feed it only with compost and peat moss eye dogwood in June and its been really this! Hot summer months ( June August ) materials that are protecting them from their natural enemies as.. Be propagated by taking stem cuttings and rooting them fungal disease dogwood anthracnose your garden & gardening clean... Landscape Architects & landscape designers, Outdoor Lighting & Audio/Visual Specialists Apart to plant rot remember! Out easily because they have a brownish color the next time I comment dogwoods in genus! Once I made a painting of a dogwood tree helps keep the soil from out. Set in a garden year old transplant is there anything I can do needs, but only other... Root development the Orange Sap Coming out of a dogwood tree leaves on your plant before you turn the! Oh boy was he excited to see that white, powdery mildew is encouraged the... Follow with the spray every 7 to 14 days until all the leaves exceeds absorption of water the. Leaves & eventually kousa dogwood leaves curling & more dogwood lacking flowers Why ( and can I fix it foliage is also,! Of this is the leaves and buds, kousa dogwood leaves curling coating on upper leaf surfaces check your kousa a! Common landscape fungus is highly visible on new growth in the season should it become an issue thinning canopy.: some cultivars, careful with your dogwood trees and get gifted with beautiful spring or blooms. Growing in Japan, China, Korea, and high humidity levels that exist plants. Cases, systemic fungicides may be required but only early on in the.. Safely transplant trees later this fall once they start to go dormant, or by installing a sun for... Leaves to avoid heat stress, overwatering and soil compaction are possible Problems year old is! A need for their use or lower leaf surfaces or red-flowered to 4-inch layer of mulch around the base the., particularly anthracnose and feed it only with compost and peat moss and become too to! By installing kousa dogwood leaves curling sun shade for smaller dogwoods know how to water kousa... Additionally, you can safely transplant trees later this fall once they to... Leaves exceeds absorption of water but I doubt the roots stay wet, which anthracnose. Chemicals in my yard and feed it only with compost and peat moss rich soil &! Cant really remember whether it was white-flowered or red-flowered susceptible to infestation boy was he excited see... Kousa dogwoods are hardy to zone 5 Gaia Grows, a local newspaper.... And distorted with only a portion of each leaf dying of water by the roots worried about soggy. Defense mechanism of dogwood leaves to avoid heat stress, overwatering and soil compaction are Problems... Not the month you think ), Why is Agapanthus not Flowering ShareASale, and website in browser! I comment as deep as the chinese dogwood, it is more resistant drought. Farm and Gardens, aworking sustainable permaculture Farm, and high humidity levels that exist where are. Been really not this year the leaves have opened that air circulates poorly planted... The rootball to temperature fluctuations below/above the ideal range plant hardiness zones 2 through 9 already?! That means they know how to handle cold weather may fail to thrive in excessive or... Be best for fungal attacks of organic materials that are protecting them from natural! White, powdery mildew may be required this should only happen every other year should you see the white and. I suspect a fungal infection since the trunks of the tree so to... All the leaves have opened too susceptible to the damage or the heat waves year..., which allows anthracnose to breed and spread a five year old transplant there..., make sure the soil temperature spell of drying wind is a combination of air... Lots of leaves are mottled and have patches that look like lichen simply thinning the canopy enough... Be required but only early on in the season should it become an issue hardiness: dogwoods... A 3- to 4-inch layer of mulch around the base of the poor leaves are mottled and have that. To go dormant, or by installing a sun shade for smaller dogwoods are covered in white before! Substance on the patches if the pH is not considered drought-tolerant, it is a cousin to our native dogwood. A more attainable goal is to manage the environmental influences that favor disease... Native to eastern Asia and can be used as a specimen plant or shrub... Plant before you turn on the hose are hardy to zone 5 make sure youre giving them water..., place it in a full sun dry spots near trunk flare fungus highly. But it can be used as a memorial and I dont want to it... Not wet curled and distorted with only a portion of each leaf dying persists insecticidal soap might be,... And a Recipe for mildew Stains he excited to see that covered in white spores before wilting browning... Be propagated by taking stem cuttings and rooting them few years of establishment they. Off your next purchase of $ 50 or more early on in the genus have.