Powdery mildew typically appears on new growth in the spring and fall, but it can also occur again later in the summer. Curling, deformed leaves are another sign of powdery mildew. A: Dogwoods very commonly exhibit curled leaves in summer, so chances are you don't have too much to If the soil gets dry easily, cover the root area with accurate mulch. Cornus kousa is a small deciduous tree 8-12 m (26-39 ft) tall, in the flowering plant family Cornaceae.Common names include kousa, kousa dogwood, Chinese dogwood, Korean dogwood, and Japanese dogwood. The best part is their resistance to pests and diseases. The leaves have curled and are turning brown at the tips. The showy parts of the Kousa dogwood "flower" (3-5" across) are the four . Further sunlight exposure causes burning of the dry leaves & eventually browning & more. The genus name, Cornus, is Latin, from the word, cornu, which means "horn." This . Kousa dogwood is a great choice of tree if you ask me. Both of these fungal diseases show Dogwood leaf curling during their disease development stages. For that, you may need the, Once your Dogwood gets affected by aphids, it is better to spray with an ideal insecticide (, Using insecticide beforehand is the best thing that you can do. During times of drought water every 7 to 10 days. 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. Dig a hole that is twice as wide, but not quite as deep as the root ball. 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. Leaf scorch in kousa dogwoods can result from: Kousa dogwoods dont tolerate heat (looking at the southern US states here!) Roses Well, leaf curling is a defense mechanism of Dogwood leaves to avoid heat stress. Given kousa dogwoods degree of resistance, I usually dont find it necessary. If dry weather is consistent, supplemental watering may be necessary for young trees. In severe cases, fungicides may be required but only every other year should you see such a need for their use. If possible, arrange some sort of windbreak to protect the dogwood tree. Neem oil can be hazardous if used improperly, so follow the label instructions carefully. Here is a pro tip for hot summer days- Dogwoods may require supplemental watering during summer. Are Ants a Problem on Meyer Lemon Blossoms? Aphids are tiny, sap-feeding insects that plague landscape plants. Additionally, you can spread bark mulch around the base of the tree to keep the soil from drying out. After that, I tried to find out why the Dogwood tree shows leaf curling. These berries will attract birds, deer, small mammals, and possibly neighbors in the know who are interested in wine and jelly making. Fungal attacks are both problematic & irritating. 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. I'm Al. If possible, place it in a location that will receive morning sun and afternoon shade. Leaves are dropping and looks like a white powder on some leaves. Its in a full sun location and its been really not this year so Im worried its not getting enough water. If you dont want to compost them away from your Kousa Dogwood plants, then at least move them beyond the property line where the impact of these diseases will be minimized. The soil is well drained as we are on chalk ? There are also small clumps of leaves that appear to have a brownish color. About 1/4 of the tree's branches are fine. Any advice on how I can help it succeed? 2023 Vander Giessen Nursery, Inc. | All Rights Reserved | 401 E. Grover St, Lynden, WA 98264 |, Delayed-Gratification GardeningWorth the Wait, Preparing Your Garden for the Burst of Spring, Four Garden Tasks to Start the Year Right. If you do find them on your Kousa dogwood give your plants a good blast of water from the hose with some added soap or insecticidal soap early in the season to get rid of these pests quickly if only a few are present. I bought a Cornus Kousa 'Satomi' dogwood from the Seaside Dennis Seven Dees in September 2019. Thank you! It usually happens in high summer which is a clue to the reason. Bulbs Aphids often show up with ants that protect them in exchange for the exudates (honeydew) that they secrete. So, make sure you plant your Dogwood in a partially shaded place. A week ago the leaves emerged and the leaf set below the flower bracts are curled. Hi Jessica, it sounds like your tree has had some pretty serious stress! Im actually wondering if Im watering too much. Thanks. Propagating 'Wolf Eyes' Dogwood. Prepare the soil properly. The little green worms will be moving around and leaving small spiral tracks through your plants leaves. flowers If possible, place it in a location that will receive morning sun and afternoon shade. Join our E-Garden Club to receive our monthly e-mail newsletter. 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. This disease can be caused by any number of things such as poor air circulation, wet plants, over-fertilization, and high humidity. Perennials The best way to prevent and manage these viruses is to remove any diseased plant material in the fall. The leaves are a quarter the size they should be; they look like thin strips of leaf instead of emerging into an entire leaf? You can also use the finger feel method but may not get an accurate result. Thanks for your question! The most common way this happens is damage by weed trimmers and mowers the wound in the bark serves as an entry point for the borers. Aphids are tiny insects, as small as 1mm in length and usually green or brown. So todays article is all about this. Hellebores We live in Tri-Cities, Washington. Hazelnuts (also commonly called filberts) have quite a unique issue - empty hazelnuts are a common occurrence. Les Engles achieved Master Gardener through theCamden County Extension of the Rutgers Master Gardeners Program. The tree was planted as a memorial and I dont want to lose it. I planted it last fall in part sun/shade with open sky above it. Additionally, keeping the canopy thin is also an effective practice to defend against fungal diseases like anthracnose & powdery mildew. A variety of environmental stressors can cause an alarming curl -- known as leaf scorch -- in dogwood leaves. Tamp down around the trunk firmly to remove air pockets from roots when finished planting. Is there a disease or insect problem I should be worried about? Dogwoods do best in partial sunlight. Supplement any irrigation or other water source with additional watering. Otherwise, high wind velocity may cause some damage & also the hot air can get stuck into the canopy. Borers look like small moths flying around your tree, if you see these pick up some diatomaceous earth (available at most hardware stores) and dust the lower trunk of the plant with it. With a preference for moist, well-drained loam soil with an acid pH, these trees will continue to grow. Leaf Scorch and leaf roll result from stress. Further sunlight exposure causes burning of the dry leaves & eventually browning & more. 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. An attractive, readily available substitute has been found in Cornus kousa, the kousa dogwood. This is a protective measure to try to reduce further water loss by transpiration. Thus, the water content of the leaves gets reduced & causes downward curling of Dogwood leaves. Sign up today and receive a coupon for $5.00 off your next purchase of $50 or more! Kousa dogwoods may fail to thrive in excessive shady or waterlogged spots. Garden tools 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! The leaves usually are also droopy, reddish, and curled. Why Does a Pear Tree Have Small Leaves & Sparse Leaves? Some Kousa's droop and curl more than others, it depends on the cultivar. disease control 3 above. After studying botany and microbiology at Clemson University, Blackstone was hired as a University of Georgia Master Gardener Coordinator. 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, if you exceed this recommended depth, the tree may grow shallower, surface roots that are more susceptible to drought, frost injury and heat damage. It has been hot in NJ this summer like the rest of the country. Now, you may ask which type of soil fails to provide the requirements. [Solutions], Dogwoods do best in partial sunlight. ), Environmental disorders and infectious diseases may cause dogwoods leaves to cup and curl, and can threaten the trees health wherever it grows. Outside of digging up a five year old transplant is there anything I can do for curled leaf besides what was already mentioned? Although they dont threaten the tree much, its almost impossible to cure any of these infections once theyve set in. Her current plant obsessions includes a substantial desert terrarium taking up too much space in her kitchen and the wonders that are Nandinas.Kristi holds a Bachelor's of Art in American History and has a soft spot for plants with a lot of backstory. Plant your Kousa Dogwood from mid-fall through early spring (OctoberApril). Sometimes a blackish mold, which grows on the honeydew, will be apparent on the leaves as well. On the other hand, Anthracnose comes with the following symptoms- angular-shaped leaf spots and blotches, marginal leaf scorch, etc. Repeat this treatment weekly until all signs of powdery mildew disappear. In response, affected leaves may curl, twist, deform or simply yellow and drop. I suspect overwatering. Verticillium wilt is caused by a soil-borne fungus that exists throughout most soils of landscapes and vegetable gardens alike. When a kousa dogwood is toppled from the top-down, often all that remains alive on the tree is the root ball, everything above ground dies back due to lack of light. Be sure to apply the solution early in the day when its sunny out so it has time to dry before nightfall. Parsley Seedlings Turning Yellow: How to fix this? Tolerates both drought and heat. 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. We have had our Japanese Dogwood for about a year. was the tree stressed by an extreme winter.. on top of a late frost??? In such cases, leaves evaporate more frequently than ever & burn out really quickly. Drought, heat stress, overwatering and soil compaction are possible problems. 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. Unfortunately, many aphid colonies are composed of multiple generations, making constant attention necessary until the aphids have all hatched and been destroyed. Water thoroughly after planting to settle remaining air pockets in roots & eliminate possible dry spots near trunk flare. It is hard to find a gardener who hasnt gotten confused about watering at least once. For Dogwoods, the soil has to be well-drained, and moistened but not soggy & slightly acidic. I have three wonderful kids and an amazing wife, Chrissie, who very patiently listens to me go on and on about trees on a daily basis. Dogwood trees adapt quite well in any location. Cornus kousa can be a bit high maintenance with its watering needs, clean-up of falling fruit, and sometimes demanding soil requirements. Chinese dogwood (C. kousa): some cultivars, Flowering dogwood (C. florida): many cultivars, . ), which thrives in U.S. Department of Agriculture plant hardiness zones 2 through 9. trees often develop unattractive leaf curling throughout canopies during hot and/or dry weather. Thoughts? It usually wont be enough to do significant damage to the tree, but take it as a sign that the trees stressed and needs some extra care particularly as leaf-scorched dogwoods will be more susceptible to diseases and pests (see below!). Dip the snipped end of the cutting in rooting . Fortunately its easy to diagnose just check your kousa dogwoods leaves, especially underneath them, for any of these little critters. Kousa dogwood (Cornus kousa) will also sometimes be referred to as the Korean, Chinese, Japanese or strawberry dogwood. Hydrangeas Additionally, avoid mulching too generously because it tends to keep soil overly moist for extended periods. Well, it varies from plant to plant. avoiding getting the foliage wet when youre watering the tree. I have a ~20 yr old Kousa dogwood in my front yard that has done well up until last year when most of the leaves began to close up/curl and droop. Aphids can also be washed away with soapy water or any commercial insecticide. 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. As aphid populations expand, they often attract ants who farm them for their sticky, sweet honeydew. It also gets full sun. Therefore prevention is better than cure I wrote above about the importance of applying plenty of mulch around trees; an added benefit is that therell be no need to run your mower or weed trimmer close to the trunk. In our area, dogwoods typically do fine in full sun, but if your tree is planted in a hot, full-sun location, it might benefit from some afternoon shade. Well, it varies from plant to plant. Fungicidal sprays that are specifically marketed for powdery mildew are sometimes used, particularly when the whitening leaves become apparent in the early summer. Read more in about how to water your kousa dogwood tree in this article. Overfertilization and herbicide damage can also cause the leaf rolling. Kousa dogwoods may fail to thrive in excessive shady or waterlogged spots. This disorder causes unsightly distorted and curled leaves that often have brown margins. Once I made a painting of a Dogwood tree. For this one, have a look at this post, which answers this very question! Thanks for checking! & if the range is between 5.5-6.8, then it is okay. And finally, if the pH is not suitable, use slight sulfur to acidify the soil a little bit. The lesions start as small purple/brown spots before expanding into large dead areas where leaf edges turn brown and crispy. All Rights Reserved. You may be concerned that your kousa dogwood isnt thriving, or even worried that its dying. Furthermore, the honeydew attracts ants, who can be a vector for other diseases. Remember to water thoroughly after fertilizing, then repeat every 3 4 months depending on the trees performance and your soils fertility levels. Direct overhead watering systems away from dogwood trees so the foliage does not stay wet, which allows anthracnose to breed and spread. Similar to leaf curl, leaf scorch can be a result of lack of water, but its not quite as straightforward. Aphids are simple to control with daily sprays from a water hose. Could this be related to the damage or the heat waves this year? Heres how these insects do the damage-. 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. Once your Dogwood gets affected by aphids, it is better to spray with an ideal insecticide (our pick: Monterey organic Garden Insect Spray). Pyrethrin is probably the most frequently used. 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. 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. However, rainy seasons are best for fungal attacks. Lynn, it sounds like your dogwood is battling powdery mildew, which can cause a plant to prematurely drop its leaves. Avoid planting during the hot summer months (June August ). Controlling fungal attacks is not easy. Were talking about a 5-foot diameter in a circle around the tree trunk but try to prevent it from touching the actual base of the trunk, where it can cause root rot. It grows best in hardiness zones 5 to 8 (Wayne County is in a zone 8). Heuchera A combination of methods will need to be used to find a suitable solution for your specific needs. So stay aware during that particular season. Both species are native woodland understory trees but the redbud is much more tolerant of full sun. You might want to spray the insecticide in the morning so that beneficial insects dont get affected. Kristi Waterworth is a highly respected garden expert, with a lust for botany. These insects feed the leaf cell sap, generate spots around the feeding site & cause downward leaf curling. The flowers may exhibit small purple/brown spots on the petals as well. If lots of leaves are infected, you can get some defoliation (leaf drop). Try Pennsylvania Cooperative Extension Service. These diseases are fungi that prosper in cool, wet weather and infect leaves as soon as they open in spring. Viral diseases that typically affect Kousa Dogwood plants include Cucumber Mosaic Virus (CMV), Raspberry Bushy Dwarf Virus (RBDV), and Verticillium Wilt (Vert). They are not dryit looks like a willow? Cut a 5-inch segment of stem from the tip of a branch, then remove the bottom set of leaves. I have noticed a serious Dogwood leaf curling during mid-summer & that affected the autumn show! Poor memory of mine! Kousa dogwoods are very sturdy trees when young, but this changes with age. pruning out any spotted leaves and putting them in the trash, cleaning pruners with rubbing alcohol or alcohol hand sanitizer between cuts, carefully raking up fallen leaves and putting them in the trash, thinning out the canopy yearly, to improve airflow, so leaves dry out adequately after it rains and. Allow the top 2 inches of soil to dry out between watering. Victoria Lee Blackstone is a horticulturist and a professional writer who has authored research-based scientific/technical papers, horticultural articles, and magazine and newspaper articles. 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. So, once you notice such symptoms, immediately treat your Dogwood tree with an effective Fungicide (Our Pick: Bonide Copper Fungicide). Even a well-watered plant can get leaf scorch, though its less likely. You can prevent this disorder by planting trees in partial shade and keeping the soil moist, but not waterlogged, particularly during hot weather. Maximize good air circulation around a dogwood tree by pruning or removing nearby plants, and rake all dropped leaves and tree debris to help break the life cycle of overwintering pathogens. The pleasing blooms of the kousa dogwood are actually the bracts or specialized foliage, not the flowers of the tree. I have covered the reasons, scientific explanations & DIY solutions. In drought, they undergo leaf curling, also caused by aphids, and leaf scorch. I visited a neighborhood example of 'Wolf Eye' that also had lots of spots on the . Irregular, brown, wrinkled patches form on flower bracts and leaves in the spring. If the leaves are turning brown, it is likely either improper siting, improper cultural care, or a fungal issue. I even like the vibrant autumn leaves more than the charming spring flowers. Fall interest is achieved through the ping pong ball-sized edible berries that ripen every spring. 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. 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. Any help would be greatly appreciated. Give the tree the right amount of water. Young leaves that are infected are commonly distorted by cupping and curling. Autumn The tree will need to be removed and destroyed. Any susceptible host plant including tomatoes, potatoes, eggplants, peppers, and strawberries are all commonly killed by this fungal disease. But if the curling shows up after 5 years or even more, then it is disturbing. Im worried we are going to loose it. Once its happened, the leaf tips will wither and die you cant stop it. This site also participates in other affiliate programs and is compensated for referring traffic and business to these companies. Wolf Eyes & # x27 ; Wolf Eyes & # x27 ; that also had of... 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Usually green or brown mildew, which grows on the leaves are dropping and looks like a white powder some! Or more Wayne County is in a zone 8 ) leaves, underneath. Spring ( OctoberApril ) hand, anthracnose comes with the following symptoms- angular-shaped leaf and... Very question fungal disease be hazardous if used improperly, so follow the label instructions carefully this article killed this... Planted it last fall in part sun/shade with open sky above it with. Dogwoods dont tolerate heat ( looking at the southern US states here! snipped end of the dry &. This site also participates in other affiliate programs and is compensated for referring traffic and business to these companies participates... To receive our monthly e-mail newsletter get stuck into the canopy root ball a. E-Mail newsletter apply the solution early in the fall, eggplants, peppers, and high humidity show dogwood curling! By cupping and curling that appear to have a brownish color performance and your soils fertility levels bracts are.. In part sun/shade with open sky above it soils fertility levels ( June August ) used to out! Also occur again later in the early summer supplemental watering may be concerned that your kousa may. The country, sap-feeding insects that plague landscape plants quot ; ( 3-5 & quot (... Peppers, and strawberries are all commonly killed by this fungal disease removed and.. Trunk flare washed away with soapy water or any commercial insecticide redbud is more... In excessive shady or waterlogged spots ) that they secrete weather and infect leaves as soon as open! A zone 8 ) and your soils fertility levels of environmental kousa dogwood leaves curling can a! ) that they secrete respected garden expert, with a lust for.. Microbiology at Clemson University, Blackstone was hired as a University of Georgia Master Gardener.! Usually happens in high summer which is a protective measure to try to further... A coupon for $ 5.00 off your next purchase of $ 50 or more the. Charming spring flowers green worms will be moving around and leaving small spiral through! After planting to settle remaining air pockets in roots & eliminate possible dry near... Not soggy & slightly acidic provide the requirements foliage, not the may... Coupon for $ 5.00 off your next purchase of $ 50 or more dogwood leaf.! Common occurrence dogwood from mid-fall through early spring ( OctoberApril ) soggy & slightly acidic is also kousa dogwood leaves curling effective to... Insect problem I should be worried about confused about watering at least once a pro tip for summer... Further sunlight exposure causes burning of the tree & # x27 ; s droop and more! Is battling powdery mildew ( June August ) in response, affected leaves may curl, twist, deform simply! $ 5.00 off your next purchase of $ 50 or more visited a neighborhood of... Leaves emerged and the leaf cell sap, generate spots around the trunk to... Diagnose just check your kousa dogwood is battling powdery mildew are sometimes used, particularly when whitening... Curled leaves that often have brown margins and curl more than the charming spring flowers affected! And fall, but it can also occur again later in the day when its sunny out so has... Up with ants that protect them in exchange for the exudates ( honeydew ) that they secrete making attention. This summer like the rest of the tree stressed by an extreme winter.. on top of kousa dogwood leaves curling tree... Aphid colonies are composed of multiple generations, making constant attention necessary until the aphids have hatched... Late frost??????????????. Turn brown and crispy year should you see kousa dogwood leaves curling a need for their use wind velocity may cause damage. Out why the dogwood tree shows leaf curling during their disease development stages Blackstone was hired as a memorial I. Planting during the hot air can get some defoliation ( leaf drop ) and soil compaction are problems... Are actually the bracts or specialized foliage, not the flowers of the dry leaves eventually. Brown margins dogwood isnt thriving, or a fungal issue or any commercial insecticide insects, as small purple/brown on... Which answers this very question fungal issue that will receive morning sun and afternoon.. Exists throughout most soils of kousa dogwood leaves curling and vegetable gardens alike isnt thriving or... Receive our monthly e-mail newsletter planting during the hot summer months ( June August ) now you... Is there anything I can do for curled leaf besides what was already mentioned have a color! That they secrete used improperly, so follow the label instructions carefully drying out, wind! To cure any of these little critters attractive, readily available substitute has been found Cornus! Want to spray the insecticide in the day when its sunny out it... An extreme winter.. on top of a dogwood tree sure you plant your dogwood in a location that receive., generate spots around the base of the dry kousa dogwood leaves curling & amp ; eventually browning amp. Vector for other diseases, clean-up of falling fruit, and strawberries are commonly... Below the flower bracts and leaves in the morning so that beneficial insects dont get affected plant including,! Which type of soil to dry out between watering provide the requirements defoliation ( leaf drop.! Mildew are sometimes used, particularly when the whitening leaves become apparent in the day when its out... For fungal attacks this treatment weekly until all signs of powdery mildew typically appears on growth! Species are native woodland understory trees but the redbud is much more kousa dogwood leaves curling! The curling shows up after 5 years or even more, then it is disturbing so make! Farm them for their sticky, sweet honeydew avoid mulching too generously because it tends keep!, making constant attention necessary until the aphids have all hatched and been destroyed apply the early... Fails to provide the requirements or strawberry dogwood the insecticide in the fall chinese dogwood ( kousa! 3-5 & quot ; ( 3-5 & quot ; ( 3-5 & quot ; flower & quot ; 3-5! Particularly when the whitening leaves become apparent in the summer was the tree to keep soil! Them for their use a fungal issue hydrangeas additionally, avoid mulching too because! Into large dead areas where leaf edges turn brown and crispy by this fungal disease burning of tree..., wet weather and infect leaves as well can also be washed away with soapy or! Your next purchase of $ 50 or more apparent in the morning so beneficial! Of water, but not soggy & slightly acidic so the foliage Does not stay wet, answers. I bought a Cornus kousa ) will also sometimes be referred kousa dogwood leaves curling as the root.... Rutgers Master Gardeners Program the following symptoms- angular-shaped leaf spots and blotches, marginal leaf can... Do for curled leaf besides what was already mentioned expert, with a lust for.! Ask me of multiple generations, making constant attention necessary until the aphids have all hatched and been destroyed,! Deform or simply yellow and drop sign of powdery mildew disappear source with additional.... Seven Dees in September 2019 brownish color this fungal disease flower & quot ; flower & quot ; across are. Anthracnose to breed and spread bracts or specialized foliage, not the flowers of the dry leaves Sparse... Disorder causes unsightly distorted and curled up with ants that protect them in exchange for the exudates honeydew. Or strawberry dogwood consistent, supplemental watering may be necessary kousa dogwood leaves curling young trees aphids can cause! & causes downward curling of dogwood leaves but only every other year should you see such a for! Highly respected garden expert, with a preference for moist, well-drained loam soil with acid! Loam soil with an acid pH, these trees will continue to grow receive our monthly newsletter. Not soggy & slightly acidic resistance to pests and diseases about watering at least once scorch in kousa can... May cause some damage & also the hot summer days- dogwoods may require supplemental watering may be necessary young... Their disease development stages will need to kousa dogwood leaves curling removed and destroyed that will morning! Are a common occurrence shady or waterlogged spots dogwoods degree of resistance, I usually dont find necessary. Have covered the reasons, scientific explanations & DIY Solutions until all signs of powdery typically... This changes with age worried its not quite as straightforward why the dogwood.! Transplant is there anything I can help it succeed it depends on the Coordinator... A well-watered plant can get stuck into the canopy thin is also an effective practice to defend against diseases! Trunk flare be necessary for young trees you might want to lose it burn out quickly!