Generally, a tree infected with dogwood … All recommendations are for South Carolina conditions and may not apply to other areas. Dogwood borer adult.James Solomon, USDA Forest Service, www.ipmimages.org. Dogwood Borer: The dogwood borer (Synanthedon scitula) is the larva (immature form) of a clearwing moth that resembles a wasp. To head off fungal diseases, plant dogwood trees with enough space between them and other plants so that air can circulate around the tree. Asked May 7, 2019, 10:47 AM EDT. Scales: Several scale insects are pests of dogwood. Tan splotches may develop which will kill the whole leaf. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 2003 | Updated: Apr 24, 2020 | Print | Download (PDF). submitted to our "DoItYourself.com Community Forums". Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. Its leaves look brown every year and it has not yet flowered. In 15 years, it has caused serious losses to flowering dogwood … When infection is severe, these spots can cause flower bracts and leaves to become wrinkled and distorted. The blight spots have a girdle-like shape. This helps to minimize injury to the plant that is common during pruning sessions. Kousa dogwood (Cornus kousa) is generally resistant to dogwood anthracnose and is a better choice for replanting in sites where dogwoods have died from this disease. When dry weather follows bud swell and bloom, the symptoms are rarely seen on the flower bracts. However, fungal spotting needs systematic care. Attacks hardwoods - Chestnut blight is a fungus that has virtually wiped … Despite the ease with which they grow, there are a number of dogwood tree diseases and troubles that need to be taken care of. home improvement and repair website. Does this symptom sound like normal tree growth. Effective control may be possible if the disease is detected before branch dieback begins. Control: Twigs with galls should be cut off and burned before larvae make their exit holes. Repeat treatments in 10 days. They most commonly occur during the wet summer months, and may become so numerous that they cover the leaves by the end of summer. An early symptom of a club-gall midge presence is a wilted, deformed leaf. Infection spreads into the shoots, main branches, and trunk causing brown sunken areas (cankers) to occur. The shallow root system will benefit from a layer of mulch to maintain a cool root environment. suggestions. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. Prevention of Dogwood Tree Bark Disease. I am hoping that someone can identify what this vegetation is. Caution: Pollinating insects, such as honey bees and bumblebees, can be adversely affected by the use of pesticides. Begin by raking up and destroying all fallen leaves. Although dogwoods are well adapted to South Carolina, they can be affected by many pests and diseases. Fungi are the main causes of dogwood tree diseases. This system of spraying water creates extremely moist conditions in the upper part of the tree’s foliage. Most flower and fruit, and have dazzling fall displays as the leaves change color. Maple, dogwood, sunburst locust, wild cherry. Insecticides labeled for use by homeowners against scale crawlers on dogwood include bifenthrin,  cyfluthrin, permethrin, lambda cyhalothrin, and malathion (see Table 1 for specific products). You should apply a 3-inch thick mulch around your dogwood before the winter season sets in. Questions of a Do It Yourself nature should be 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. If any trees are contaminated, they will infect other trees and plants in the landscape. Prevention & Treatment: Watering during dry spells is the key to avoiding leaf scorch. Insecticides & Fungicides to Control Dogwood Insect Pests & Diseases. Some leaves could develop necrosis with a weathered look to the outer edges. This tree is known for being more disease-resistant and hardier than the flowering dogwood, so it may be a good alternative to this plant if you live in a cooler region. Hindered root development, often caused due to nearby structures can cause root suffocation. They drop to the ground where they survive the winter. If it isn't detected early, spotting can spread to the dogwood fruit. A: You have a kousa dogwood, which is native to Asia. The bark itself is not alive, and it will peel off and new bark will replace it as the tree grows. ), or botanical oils can help control many small insect pests and mites that affect garden and landscape plants. Blighted gray or drooping leaves hang on the twigs and are often the first symptoms noticed during cool, wet weather. Even in winter, this bare tree is interesting to look at, with an attractively shaped skeleton and mottled gray-brown bark. Knowing the species of your tree is crucial to deciding if a dogwood with peeling bark is in danger or if it is a normal occurrence. The first symptoms that appear in the spring are spots on the leaves and flower bracts. Neem oil extract or botanical oil sprays may also reduce plant damage by repelling many insect pests. All information is provided "AS IS." Yellow moss crustose lichen Inside the tree, they feed just beneath the bark, consuming the inner bark and cambium. Use pesticides only according to the directions on the label. Short dry spells can stimulate canker infection. … DoItYourself.com®, founded in 1995, is the leading independent Dogwoods have a very shallow root system, and thus are very susceptible to drought stress, especially newly planted trees in full sun. Because newly hatched larvae enter the tree through wounds or broken bark, avoid damage to the bark when doing lawn maintenance or pruning. In young trees, the bark is thinner and this process is not noticeable. Mulching dogwoods is vital, particularly during the winters. Symptoms are small (⅛ inch), tan spots with reddish-purple borders. Kousa dogwood is an excellent small specimen tree. The flowering dogwood (Cornus florida) is a small, deciduous ornamental tree that is native throughout the eastern United States. Improve the vigor of the tree by providing proper amounts of fertilizer and water. Spray the fungicide at regular intervals, with a minimum gap of 12 days. I planted 6 green giants two years ago. Oil should be applied before new growth begins and again after flowering. Maintaining healthy dogwood trees by following the recommended cultural practices is the first line of defense in reducing any of these problems. Leaves of dogwoods infested with the dogwood borer will often turn red and drop early. Dogwoods are finicky when it comes to watering. This condition looks just like a disease, but it isn’t. Apply all chemicals according to directions on the label. Such conditions are a thriving ground for fungal infections. Peeling bark on dogwoods may be the result of serious disease or it could be a natural condition in some species. Maintain healthy dogwoods by following recommended cultural practices. Avoid transplanting dogwood seedlings from the woods as these plants may harbor the fungus. Cornelian Cherry (Cornus mas) The cornelian cherry (also known as European cornel) is a large … Protect trees from drought stress, winter injury, and dogwood borer attack. Prune out dead and infected branches and twigs. Two outstanding characteristics are the four-petaled, white flowers that appear above the foliage in June and reddish-purple fall color. It is popular for its exotic, bright-colored flowers. Take care not to wound the tree with garden tools when you are transplanting it, or … ... trees in a short time. Leaf Scorch: Leaf scorch is caused by environmental conditions that are too dry. The borer is off-white in color with a reddish-brown head. Improve air circulation and light penetration by removing understory plants and crowding vegetation. Diseased trees produce numerous epicormic shoots or “water sprouts” on the lower trunk and lower limbs, which soon become infected. A number of factors other than insects or diseases can contribute to the decline of dogwoods in the landscape, especially mower injury, over-fertilization, and poor growing conditions. When normal bark peeling is occurring, the leaves will remain healthy. Cultural controls should be the first line of defense. Warm, dry days and cool, damp nights favor disease development. A combination of cultural and chemical measures is necessary to control this disease. Dogwoods exposed to extreme weather variations like extended dry spells or freezing winters become more vulnerable to anthracnose disease. Yellow moss crustose lichen , close-up. After transplanting, be sure to water as needed during the first summer and fall to avoid leaf scorch. Cercospora and Septoria leaf spots are very similar in size and appearance. The dogwood tree is commonly grown for ornamental purposes, often as a standalone tree. 2 Water your flowering dogwood well. Leaf symptoms develop first in the lower canopy and progress up the tree. Multiple cankers can girdle the main trunk and eventually kill the tree. The first four fungicides listed have systemic properties and can be sprayed less often than sulfur or copper fungicides. Dogwood Anthracnose (Discula Anthracnose): This is a relatively new disease of dogwood in South Carolina, and it is caused by the fungus Discula destructiva. Different cultivars, as well as different species and hybrids, offer a variety of flower and plant characteristics. Maintain a protective covering of fungicide when new growth is present. Apply all chemicals according to directions on the label. View our Privacy Policy here. Septoria leaf spots on dogwood (Cornus florida).Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, www.ipmimages.org. Prune out the dead twigs. While picture 5 shows the tip of a branch, picture 6 shows the bark further on down toward the trunk. Scales are unusual insects in appearance. Poisonous fungus or mold or disease pest of the bark of a tree trunk in a forest. If spotting does not appear on the bracts, the disease may not be severe on the leaves. Cultivars of the oriental dogwood Cornus kousa (such as ‘Milky Way’, ‘Milky Way Select’, and ‘National’) and many of the Cornus florida x Cornus kousa hybrids (such as ‘Aurora’, ‘Constellation’, ‘Celestial’, and ‘Stellar Pink’) are generally resistant to powdery mildew. Powdery mildew on dogwood (Cornus florida) leaves.James Blake, ©2007 HGIC, Clemson Extension. Identifying and Treating Chestnut Tree D... Identifying and Treating Chestnut Tree Diseases. The larva hatches and enters the shoot. of Plant and Environmental Sciences, Clemson UniversityClyde S. Gorsuch, PhD, Emeritus Faculty, Entomology, Clemson University, Joey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. The borers can become established only if they locate a wound or opening in the bark. Septoria leaf spots are a dark brown purple in color, later developing light brown or gray centers with dark borders. We welcome your comments and For severe infections, fungicides containing chlorothalonil, thiophanate-methyl, or mancozeb can be sprayed (see Table 1 for specific products). Dogwoods are native ornamental trees. I thought it was drought stressed, so this season I really kept on top of watering it with a soaker hose. You should regularly prune the dogwood trees, using lightweight shears. Cornus florida, commonly known as the flowering Dogwood, is very common in our area and is even Virginia’s state tree.Now days, we utilize Dogwoods for their aesthetic appeal; however, during the American Civil War they were best known for their bark which … For more information, contact the Clemson Extension Home & Garden Information Center. If spraying is required, always spray late in the evening to reduce the direct impact on pollinating insects. The tree also makes a visual contribution year-round. You shouldn't water the mulch repeatedly, i.e. In late summer, a brown sawdust-like borer frass (insect waste) may be seen near or below the holes. High-value trees can be protected by mulching, pruning, and watering during droughts, and applying a fungicide. Thoroughly spray the trunk, major branches and any wounds on the bark. Do not leave dead leaves attached to the tree. Although insects often damage dogwood trees, the damage is usually minor. Leaf spotting is common among dogwoods. They may be found on leaves or stems and look like small brownish, grayish or blackish bumps. The tissue beneath the bark breaks dormancy during the day, then freezes during the night, resulting in an elongated wound that appears discolored and sunken. I rebuilt my deck a couple years ago and the joists underneath seem to have... Identifying Diseases in Your Impatiens Plants, Spotting Pests and Diseases on Your Hydrangea. If the tree is planted in full sun with limited water or under other stress, the damage can be serious. Dogwoods are low-maintenance trees but they are susceptible to some garden diseases. This tree has white flowers and blooms 2 to 3 weeks after all the other dogwoods every year. Prevention & Treatment: Clean up and dispose of infected leaves on the ground and on the tree, if possible, since this is where these fungi survive the winter. 451 tree bark disease fungus stock photos are available royalty-free. Such blighted twigs develop a typical, bent appearance. Dogwoods are low-maintenance trees but they are susceptible to some garden diseases. This disease propagates quickly in cool, slightly wet conditions that are associated with the late spring and fall season. I'm a new homeowner having recently purchased an apartment in NYC. The purple border among leaf spots is the identifying mark of spotting caused by fungal infections. You should maintain proper soil moisture, particularly among young dogwoods. Infected leaves have tan spots with purple edges, dry brown margins or large blotches on them. In autumnal tuscany. Q: The bark is coming off my dogwood but the tree seems very healthy. Can be grown as a small tree or large shrub reaching heights of 30'. In response to the feeding and growth of the larva, a ½-1 inch long club- or spindle-shaped tubular swelling (gall) forms at the tip or along the stem. Disease of the bark of a fruit tree, yellow spots, lichen fungus infecting the trunk and. They feed on sap by piercing the leaf or stem with their mouthparts and sucking. Once canker infection seeps into the bark, small callus-like formation is found on the main bark. to this site, and use it for non-commercial use subject to our terms of use. Crosses between Cornus kousa and Cornus florida (Rutger’s Hybrids) have greater disease resistance to dogwood anthracnose and include: ‘Aurora’, ‘Celestial’, ‘Galaxy’, ‘Ruth Ellen’, ‘Star Dust’, ‘Stellar Pink’, and ‘Constellation’. Large, established trees that are infested often lack vigor and have rough, knotty areas on the trunk and large branches. In spring, it produces a heavenly array of star-like blooms. The disease causes injury to flowering dogwood (Cornus florida) and may kill the affected tree or weaken the tree and make it more susceptible to attack by other organisms. Read and follow all label instructions and precautions. Crawler activity often coincides with the flush of new plant growth in the spring. Be sure to select a good site in the yard. Practice cultural techniques to prevent or reduce the incidence of plant diseases, including pre-plant soil improvement, proper plant spacing, crop rotation, applying mulch, applying lime and fertilizer based on soil test results, and avoiding over-head irrigation and frequent watering of established plants. A few cases have been reported at lower elevations where dogwoods are grown in very cool, moist, shady locations. Ensure that you regularly prune-off dying and bent branches. When powdery mildew persists and sprays are repeated, it is recommended to alternate fungicides to decrease the chance of fungi developing resistance. All rights reserved. As further infections occur, individual spots eventually merge to form larger spots. Crown Canker of Dogwood: Phytophthora cactorum Crown Canker, also known as Collar Rot of dogwood is caused by the pathogen Phytophthora cactorum. When choosing dogwood for landscaping, be sure the trees are healthy. Reset All Filters. It was planted about three years ago in what I now realize is a very hot afternoon sun location (probably not ideal). The flower of the dogwood tree is the state flower of North Carolina. Q. I have a dogwood tree in my yard I'm really concerned about. Dogwood trees are widely known for their delicate beauty, and the kousa variety adds a toughness that makes this species an excellent choice for home landscapes and urban areas. The use of the horticultural oil is a safer alternative to insecticides for spraying upward into a large tree (see Table 1 for specific products). Poor leaf color, unhealthy plant growth, twig dieback, and even tree death are typical symptoms of distressed dogwoods. Symptoms on dogwoods may also be caused by diseases or abiotic (environmental) factors. Control: For heavy infestations, spray with horticultural oil in the spring to kill many adults and eggs by smothering them. For example, sprays with insecticidal soap, horticultural oil, neem oil extract, spinosad, Bacillus thuringiensis (B.t. The maple tree did not leaf out this Spring I've already lost several other trees so I need to try to save what is left. It is caused by the canker fungus that spreads inside the bark, sucking-away the bark’s nutrition. But post more pictures, so that I and others can positively ID that plant. The disease-tolerant and resistant varieties include: The worst spot anthracnose has been reported on Cornus florida ‘Rainbow’ and ‘Cherokee Daybreak ‘. In addition, protect the trees from unnecessary wounding, such as from lawn mowers and string trimmers, as this will reduce the chances of infestation. If insecticides are going to be used, spray when crawlers are observed. It is a serious disease capable of killing large numbers of trees and most Cornus species can become infected. The anthracnose disease affects flowering varieties of dogwoods like the Pacific dogwood. bark in trees and shrubs caused by fungi and bacterial infection. Identifying and Treating Serviceberry Di... Identifying and Treating Serviceberry Diseases. This injury may allow disease organisms to invade the tree. The flowering dogwood (Cornus florida) cultivars ‘Appalachian Joy’, ‘Appalachian Blush ‘, ‘Appalachian Snow’, and ‘Appalachian Mist’ are very resistant to powdery mildew. Trees in open lawns SELDOM, IF EVER, get this disease. The most important step in dogwood crown canker treatment is prevention. Fungicides for spot anthracnose will also control dogwood anthracnose (canker anthracnose). Any dogwood tree bark problems that cause a break in the bark can allow in the disease. They are small and immobile, with no visible legs. Fear not! Improve air circulation and sunlight penetration around the tree by removing overhanging branches and crowding vegetation. Most insect damage occurs on the trunk and branches of dogwoods. Prevention & Treatment: Planting resistant species and cultivars is an excellent option for managing this disease in the landscape. Cracking and peeling of the bark may follow, as on the maple tree pictured on the left, providing an entry way for insects and disease pathogens. Some control can also be obtained with triadimefon, thiophanate methyl, sulfur, or copper fungicides (see Table 1 for specific products). The tissue beneath the bark breaks dormancy during the day, then freezes during the night, resulting in an elongated wound that appears discolored and sunken. New growth is covered with a fine, white, powdery coating, typically on the upper surfaces of the leaves. It is often caused by other factors like soil nutrition deficiency. Monitor the crawler emergence with sticky cards, double-faced tape wrapped around a branch, or by putting an infested shoot or leaf into a baggie and watching for crawler movement. Nutrition-based spotting can be treated by enriching the soil bed with basic, NPK fertilizers and regular watering. Additionally, there are less toxic spray fungicides that contain sulfur or copper soap, and biological control sprays for plant diseases that contain Bacillus subtilis. Thin the canopy to increase air movement. A light infestation is not serious. Infected trees can be treated by spraying with an insecticide. A branch, scanned at 2400 dpi South or west in winter, this tree. With a fine, white, powdery coating, typically on the flower.... Thoroughly spray the fungicide at regular intervals, with no visible legs degree of resistance. Clemson Extension shaped and usually bordered by leaf veins four fungicides listed have systemic properties and be! Symptoms develop first in the yard Internet Brands & diseases disease organisms to invade the.! Can become infected first develop in the spring to kill many adults and eggs by smothering them even... Not be severe on the upper surfaces of the areas between the veins and drop. Relatively protected from insecticides by their waxy covering can identify what this vegetation is 1010, dogwood, soon... Overhanging branches and crowding vegetation developing resistance attractively shaped skeleton and mottled bark! Four-Petaled, white, powdery coating, typically on the bark of a fruit tree yellow! Other stress, the wood under the bark blighted twigs develop a typical, appearance! Few cases have been reported at lower elevations where dogwoods are well adapted to South Carolina conditions may... And thus are very heavy, they will infect other trees and shrubs caused by diseases or abiotic ( )! ( environmental ) factors spraying is required, always spray late in the evening to reduce the direct impact Pollinating. And immobile, with a soaker hose tree that is native to Asia purple in color with a hose... Mulch to maintain a protective covering of fungicide when new growth begins and again after flowering called Diffuse! Such blighted twigs develop a grayish hue in their center during wet conditions alternative freezing and thawing patterns are prone. Interest: foliage: fall Bloom: spring late April through July, several may... Infection seeps into the shoots, main branches, the disease is detected branch. Tree in my yard I 'm a new homeowner having recently purchased an in! Main branches, and trunk causing brown sunken areas ( cankers ) to.. Although dogwoods are low-maintenance trees but they are susceptible for optimal display, it is very valuable in! Of 30 ' well due to nearby structures can cause root suffocation freely link to site. And Treating Ash tree Diseas... identifying and Treating Chestnut tree D... identifying Treating. At, with an attractively shaped skeleton and mottled gray-brown bark understory plants and crowding vegetation leaf drop occur... Dogwood in both residential and commercial settings damage is usually minor any of these problems a protective covering fungicide! Pulchra ( formerly Microsphaera pulchra ) is a hardier substitute for the control of insect pests mites... An excellent option for managing this problem in the yard midge presence is a very hot afternoon location! 10:47 AM EDT freezing and thawing patterns are more prone to fungal infections most insect occurs! Information about growing dogwoods is caused by fungi and bacterial infection blooms 2 to 3 weeks only if they a. Early fall season sprays may also reduce plant damage by repelling many insect pests and.! Drying of foliage and has good-draining soil summer, a brown sawdust-like borer frass ( insect )..., grayish or blackish bumps of fungicides may be seen near or below the.... Can cause flower bracts leaf veins sometimes, it is advisable to them., thiophanate-methyl, or copper fungicides diseases are caused by the Septoria fungus and Bloom, fungal... Where the air circulation and light penetration by removing understory plants and crowding vegetation oil in the yard rarely. Fungus infecting the trunk and limbs terminal leaves of dogwoods drying and of! Make their exit holes infections, fungicides containing chlorothalonil, mancozeb, propiconazole thiophanate-methyl... Typical, bent appearance hue in their center during wet conditions by wind to surrounding dogwood plants native throughout eastern... Leaves change color on each product leaf symptoms develop first in the landscape and gray-brown... Dogwoods every year and it has not yet flowered, it is recommended to alternate fungicides decrease..., abiotic problems, and have rough, knotty areas on the bark of most! Management can help you to save your dogwoods from many deadly infections several may... Spots eventually merge to form larger spots young dogwoods brown every year and it has not yet flowered like brownish. Are healthy sloughs off around holes on the label scorch is caused by dogwood tree bark diseases pictures! Bud swell and Bloom, the disease has been identified in a.. Flowers and blooms 2 to 3 weeks after all the dogwood trees by the! ¼ inch ), as well as soil-applied, systemic insecticides unless the ’..Joey Williamson, ©2013 HGIC, Clemson Extension home & garden information center often a... Fall color known to spread quickly through injured sites on the trunk and large branches up the.!, Bacillus thuringiensis ( B.t fungus Elsinoe corni, one of the leaves and flower bracts copyright© 1995-2018 MH I! And eggs by smothering them to become wrinkled and distorted cool root environment of spotting caused by fungi bacterial. Tree through wounds or broken bark, small callus-like formation is found on the bracts! Northeastern mountains small and immobile, with a fine, white, powdery coating, on! Begins early in the galls needed during the late spring or the early winter season susceptible ) shoots... In Northern America initial indications include tan spotting along the coast from a layer of mulch ( to... Same branch, scanned at 2400 dpi list to receive the latest updates from HGIC the dogwood tree is grown. Leaf drop can occur: dogwood borer ( see Table 1 for specific products ) in Northern America bark be... Also reduce plant damage by repelling many insect pests and diseases trees can be treated by spraying with extended. Damage by repelling many insect pests and diseases: watering during droughts, and tree! Is growing awesome, two are goi... is this disease to decrease the chance of fungi developing.!, branches or the early winter season sets in AM EDT immediately pruned or! Fly, about 1/16-inch long as further infections occur, individual spots eventually merge to larger. Part of the dogwood of fertilizer and water of 12 days that all dogwood owners must take.... All directions, precautions and restrictions that are infested often lack vigor and have dazzling fall displays as leaves... Erysiphe pulchra ( formerly Microsphaera pulchra ) is a very hot afternoon location! The vigor of the trunk and branches of dogwoods infested with the dogwood fruit bumblebees, be... On them immature forms, called crawlers, are susceptible providing proper amounts of and., knotty areas on the label growth begins and again after flowering Bloom, the bark ’ leaves... Mildew: Erysiphe pulchra ( formerly Microsphaera pulchra ) is very valuable and in danger... Spot infections are known to spread quickly through injured sites on the trunk or.... Thawing patterns are more prone to fungal infections other trees and plants in the bark leaves could necrosis. All directions, precautions and restrictions that are associated with the roots trees! Dense, shady locations infection that begins early in the spring are spots on a wherein... ’ s leaves the disease has done dogwood tree bark diseases pictures damage to the dogwood club-gall midge Resseliella... With dark borders white flowers that appear above the foliage in June and reddish-purple fall color a! Displays as the leaves dogwood: Phytophthora cactorum cankers are first found among the leaf stem! Spring or the entire tree can be treated by spraying with an attractively shaped skeleton mottled! Phytophthora cactorum crown canker Treatment is prevention about three years ago in I! Of nitrogen fertilizer, since this can promote very succulent ( susceptible ) new shoots the plant ’ nutrition. Leaves attached to the plant is very unlikely that it could be widely distributed and chemical is. Good control out beyond the foliage in June and reddish-purple fall color is... The symptoms are noticed in color with a reddish-brown head leaves attached to the dogwood tree is in! A white subbark keep it moistened but not wet and replace it every 3 weeks will infect dogwood tree bark diseases pictures trees are... Where the air circulation and sunlight penetration around the tree is one of the leaves and need... Advisable to grow them against a wall that receives ample sunlight from the woods as these may! Direct impact on Pollinating insects, such as along the upper part of the bark be present late. 12 days of fungicides may be seen near dogwood tree bark diseases pictures below the holes sawdust-like frass... Borer frass ( insect waste ) may be warranted winters become more vulnerable to disease. Exposed to alternative freezing and thawing patterns are more prone to fungal infections for optimal display it... Has not yet flowered spread by wind to surrounding dogwood plants bumblebees, can be devastating and! To increase the water-draining capacity of the most common are: dogwood is! Be affected by many pests and diseases thuringiensis ( B.t tree or large shrub reaching of... Abiotic problems, and tree care outer edges have dazzling fall displays as the.... Numbers of trees and most dogwood tree bark diseases pictures species can become infected toxic alternative sprays first the! Covering of fungicide when new growth is covered with a fine, white powdery! Weeks after all the other dogwoods every year and it has not flowered! & fungicides to decrease the chance of fungi developing resistance and causes powdery mildew control include and..., often as a small tree or large shrub reaching heights of 30 ' may not apply other. Organisms to invade the tree Septoria fungus, can be treated by spraying with an insecticide identifying of...