Sooty mold on leaves (photo by Jack Kelly Clark). Chemicals are a last resort. Donate today and help us continue to increase the number of trees we plant! It has been described as "one of the most splendid elms, having the poise of a graceful Nothofagus".. Take control measures on highly susceptible species. Email Dr. Hort at home@sfchronicle.com or send a stamped, self-addressed envelope to Dr. Hort, c/o San Francisco Chronicle, 901 Mission St, San Francisco CA 94103. Branch Strength Rated as Medium Weak to Medium. Most often seen on Chinese Elms (Ulmus parvifolia), this fungus causes branches to die back from the tips, causing a “frizzy hair” look to the tree (see photo). Uncover during the day. Aphids cause curling, yellowing, and distortion of leaves and stunting of shoots. Outdoor rated string lights ("Christmas lights") in the tree at night can also help, especially if it is covered. It is a tough, durable tree and easy to transplant. Jacaranda (Jacaranda mimosifolia) and New Zealand Christmas trees (Metrosiderus excelsus) are some of the more common San Francisco street trees subject to frost damage. Promptly burn or bury all wood greater than 1/2" in diameter or larger because bark beetle larvae can live there. It is drought tolerant once established and will not tolerate wet soils as this can cause root rot. Horticultural oils or soaps can also work if timed correctly. Nitrogen Deficiency Adding organic nitrogen fertilizer on a regular basis can help – but don’t overdo it. Follow the manufacturer’s application instructions. Area Horticulture Agent looks into the diseases affecting Drake elms. Leaves will look black and “dirty.” See aphids and scale info, above. When one thinks about dying elms it’s easy to jump to worrying that it might be Dutch elm disease, the fungal disease that has wiped out millions of elms in North America and is active here in Napa County. Dutch Elm disease, one of the most destructive shade tree diseases in North America, is caused by a fungus spread by the elm bark beetle. The bark naturally exfoliates and falls off. Leaves will yellow, but the veins remain green. Madrones are  too difficult to establish in the Napa landscape, but its near-twin Arbutus Marina is beautiful and medium-sized, and it succeeds nicely with minimal care. It’s a classic shade tree in every way but with even more benefits. Get directions and info here or call 510-643-2755. The leaves of these plants are oval in shape. Windburn is usually not fatal if the tree is generally tolerant of conditions. The bark provides winter interest as exfoliation leaves irregular spots of orange, gray, green and brown. The stately American elm tree was a popular shade tree before Dutch elm disease devastated it. Susceptible to Dutch Elm Disease. It’s characterized by branches looking black and wilted as if they have been burned by fire. Also referred to as the lacebark elm, though this tree is typically considered resistant to severe yellowing diseases, keep in mind that resistant does not mean immune. The San Francisco Botanical Garden sometimes has plant clinics. Here are the basic concepts of “integrated pest management,” an effective and environmentally sensitive approach to pest management: Here are some common problems and possible solutions: SymptomPossible CausesSolution Susceptible tree species: Chinese elm is naturally susceptible (although the ‘Drake’ variety is resistant). If there is little damage, some aphids are OK. Chinese elm (Ulmus parvifolia), can be recognized by its broad spreading and sometimes weeping structure, small leaves, thin flaky bark and sometimes evergreen habit in contrast to the Dutch elm disease susceptible American and English elms, which are fully deciduous, taller and more upright at maturity. This could include but is not limited to: painting chemicals, motor oil, cleaning solvents, etc. Sooty mold in itself is generally harmless and can be ignored, except when it covers leaves so much they can’t get enough light. This is a good replacement for American elm which is apparently going extinct due to Dutch elm disease. Fungicides should be specifically for powdery mildew, and only used as a last resort. A close look at infected trees reveals that the twigs and small branches are pliable and alive. Do not prune elm trees between mid-April and mid-October. You can cancel at any time. You have permission to edit this article. Tree inspectors examine elm trees every summer; St. Paul requires infected trees to be removed within 20 business days of notification. Some specimens grow in the typical vase-shaped elm form. Chemicals dumped into tree basin This could include but is not limited to: painting chemicals, motor oil, cleaning solvents, etc. To prevent frost burn, keep plants well watered. Avoid excessive fertilization or irrigation – these promote susceptible new growth. Prune out infected tissue and dispose of it away from plants. Powdery mildew on crape myrtle shoot (photo by Jack Kelly Clark). The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola. I noticed today that a lot of bark seems to be flaking off (green underneath) too. He planted a couple of Drake Elm trees. More at http://www.test-tube.org.uk/trees Find out as much as possible so your efforts aren’t wasted. This is the first on a short series about trees. The tree has upright, spreading branches bearing dark-green leaves. Personally, I have never seen a Chinese elm show symptoms of this infection. Meet the Gardenality Team. It is usually resistant to Dutch elm disease and phloem necrosis. By the time the leaves fall from the tree, the spots have often grown together and other discolorations have developed, making it hard to differentiate between the diseases without a lab test. The Chinese elm should not be confused with the Siberian elm (Ulmus pumila), which is hardy to USDA zones 4 through 9 and can be invasive, as well as a poor landscape tree. The roots will venture out as much as one and a half times the width of the canopy. Get up-to-the-minute news sent straight to your device. Drake elm, lacebark elm Uses Horticulture: Most of the elms make great shade and avenue trees, and Chinese elm is one of the best. During the fall the weeping Chinese elm's leaves turns purple, red or yellow. Feed inside leaves, first appearing as serpentine mines and gradually coalescing to give the appearance of brown blotch-like mines between leaf veins; Damaged leaves may remain on the tree throughout the growing season; Larvae are translucent white, legless, and are present inside leaves in late spring There are several damaging diseases and pests that affect elm trees. Water-Based Problems: Drowning and Edema The first sign of a drowning Chinese elm is rotting bark and discolored, dying leaves. Introduction The street trees in Cypress Isles are Drake Elms (Ulmus parvifolia 'Drake') a cultivar of the Chinese Elm (Ulmus parvifolia). Aphids are small (less than 1/4 inch long), soft-bodied insects that suck sap from leaves, twigs, or roots. Our tree is doing well and really makes a difference in our block. An excellent tree that is surprisingly under-used, Chinese elm possesses many traits which make it ideal for a multitude of landscape uses. Peel the bark off the stump to below the soil line. Planted an 8 foot Drake Elm in backyard 3 weeks ago. Dutch Elm Disease in St. Paul. So, if your tree is 25 to 30 … Some other varieties display Elm tree problems such as Dutch Elm disease, elm leaf beetles or borers, but the Drake Elm is exceptionally pest and disease resistant. It sometimes causes large cankers of limbs and trunks, which can be excised with a chisel. In urban environments, aphids can produce copious amounts of “honeydew” excretion, which often turns black with the growth of a sooty mold fungus. Leaves to appear yellowish, or chlorotic. Height: 35 - 45 feet. Don’t prune off the frost-burned branches until you are sure no further frosts are expected. Insects, Diseases and Other Plant Problems: It also has good resistance to Japanese beetle and elm leaf beetle. Ulmus parvifolia, commonly known as the Chinese elm or lacebark elm, is a species native to eastern Asia, including mainland China, Taiwan, Japan, North Korea, South Korea and Vietnam. Why is it suddenly so prevalent this spring? Traps, such as Tanglefoot®, can be smeared on a stiff band of paper taped around the trunk and stakes, and can catch scale during its young “crawler” stage. Drake elms, or Chinese elm trees, are popular because they’re more resistant to Dutch elm … Smaller trees for specimens are always in high demand, yet the Drake Chinese Elm remains under-used. Windburn is usually not fatal if the tree is generally tolerant of conditions. Dutch Elm Disease (fungus – Ceratocystis ulmi): Symptoms may appear on one or more branches on any part of the tree in contrast to phloem necrosis where tops of infected trees show first abnormalities. This is usually more noticed on young trees. Even in our urban environment, aphids have natural predators that will keep the population under control. You may detect a chemical odor. They are pear-shaped insects with long legs and antennae. Scale insects are usually slow moving or don’t move at all. This has been such a life-changing, street-transforming, neighborhood-lifting experience." They can get into sewer lines causing damage. The outer foliage is keeping the inner foliage warm. Good resistance to Dutch elm disease and elm yellows and moderately resistant to elm leaf beetle. When your Chinese elm displays yellow leaves, you need to act quickly because this is a sign of two potentially severe disease problems. Drake Elm Tree Overview ... Never use any information from Gardenality to diagnose or treat any medical problem. The growth rate of Drake elm slows down as it ages. The Allée Elm grows quickly in the early years and becomes a massive mature tree of 60-80 feet in height with a 45-65 feet spread. Susceptible to Texas root rot in desert. Environment conducive to infection: The spores are released during spring rainfall. Foliage in autumn often turns shades of So we told the landscaper a few years ago what we were trying to avoid. (Some text adapted from the Department of the Environment website; see links below). Visit his website, billpramuk.com, email questions to info@billpramuk.com, call him at 236-2884 or visit Bill Pramuk, consulting arborist, on Facebook. Wind is drying, so try increased watering if the soil drains well. Allee is much easier to maintain a leader in the nursery and in the landscape than 'Drake'. These species of elms are popular as ornamental landscape trees or shade trees. I followed the instructions on how to plant (Dug a hole twice the size as the root ball, watered well, eliminated air pockets, mixed with new tree/shrub dirt and the native soil, tried to spread the roots out some, and put mulch on top, and even anchored the little tree … But no tree is absolutely free of pests and diseases. Cover with an old sheet or towel at night if frost is expected, trying to leave an air gap between the sheet and foliage. When properly cared for, elm trees have a very long lifespan. Disease, pest, and problem resistance. Planting one so close to your house can cause problems down the road both with branches and with roots. Also called the Drake elm and the lacebark elm, these beautiful trees can be among the first to green up in the spring and the last to turn colors in the fall, long after most other trees have submitted to the season. The weeping Chinese elm (Ulmus parvifolia "Sempervirens") is a deciduous tree with vase-shaped foliage supported on multiple branches. Wetwood: Foul smelling liquid oozing from branch stubs, pruning cuts, or cracks in the bark runs down the trunk and leaves gray streaks. Neem Oil – Works quickly by suffocating the aphids. FUF helps you with that decision when you plant through us. Native geographic location and habitat. Pests of Landscape Trees and Shrubs, publication # 3359, published by University of California, has very good pictures and helpful tables matching symptoms to causes. This is known as iron chlorosis. Tree & Plant Care. Although sooty mold is not a bug, it is generally associated with aphids. Has the soil drainage changed in the area it's growing in? With this disease, the bundle… Often seen on London Plane/Sycamore trees in the city (Platanus acerifolia), it is generally cosmetic and not fatal. Is it a bug, disease, or something else? The leaves of these plants are oval in shape. Here we describe pests and their effects, and list some least-toxic methods of control. An excellent tree that is surprisingly under-used, Chinese elm possesses many traits which make it ideal for a multitude of landscape uses. Disease, pests, and problems Elm flea weevil is a minor problem. To stay healthy, pruning is needed regularly on younger trees but is more of a cosmetic task on older trees. To prevent frost burn, keep plants well watered. Outdoor rated string lights ("Christmas lights") in the tree at night can also help, especially if it is covered. sional series discussing diseases of landscape trees, addresses anthracnose on chinese elms, one of the most common trees in urban landscapes. Elm trees are beautiful, sturdy trees that grow quickly in a variety of climates. Leaves on individual branches wilt and turn yellow; in some instances leaves wilt very rapidly, dry out, then fall while still green. There are many kinds of scale. Anthracnose is a general term for a large group of fungi that cause similar diseases in many plants. Allergy Health Hazard. Native geographic location and habitat. The color of Chinese elm leaves is rich green and the texture is leathery. Drake elm, lacebark elm Uses Horticulture: Most of the elms make great shade and avenue trees, and Chinese elm is one of the best. The fast-growing Chinese elm (Ulmus parvifolia) has a striking, rounded canopy of dark green leaves. Introduction The street trees in Cypress Isles are Drake Elms (Ulmus parvifolia 'Drake') a cultivar of the Chinese Elm (Ulmus parvifolia). Leaves will yellow, but the veins remain green. Chinese elm is naturally resistant to Dutch elm disease, probably because the species originated in regions where Dutch elm disease was present. Chinese elm trees can grow up to a height of 60 feet. Tree Characteristics. You can wash leaves when you’re watering your young tree, washing your car, or watering plants. Disease, pests, and problems Elm flea weevil is a minor problem. Be sure that any contractors you hire understand that they are not to dump any toxins in the tree basins (including the neighbor’s!) The roots will venture out as much as one and a half times the width of the canopy. For more information about other pests and their least-toxic control methods, visit these excellent sites: San Francisco Department of the Environment, UC Davis Integrated Pest Management En Español. AND to get some treatment to make your dog more comfortable, if it's likely it's the elm leaves (i.e. This tree is desirable, but some homeowners confused this elm with the Siberian elm which is a tree to avoid in the landscape because it would be invasive like other Asian tree species. Dutch Elm Disease (fungus – Ceratocystis ulmi): Symptoms may appear on one or more branches on any part of the tree in contrast to phloem necrosis where tops of infected trees show first abnormalities. Aphids are among the most common garden pests, especially in the spring and summer. Disease, pest, and problem resistance. Many species of aphids cause the greatest damage when temperatures are 65-80 F. The presence of ants often indicate aphids, because ants act as “farmers,” protecting the aphids, in order to harvest their honeydew excretions. Put the right tree in the right place. Thank you all of your great work. then {{format_dollars}}{{start_price}}{{format_cents}} per month. To stay healthy, pruning is needed regularly on younger trees but is more of a cosmetic task on older trees. What we are seeing on the Chinese elms this spring is anthracnose, another type of fungal disease that tends to infect and kill, for the most part, leaves, buds and twigs. Most often seen on Chinese Elms (Ulmus parvifolia), this fungus causes branches to die back from the tips, causing a “frizzy hair” look to the tree ( see photo ). Q. Drake Elm leaves have turned brown. These species of elms are popular as ornamental landscape trees or shade trees. See more information here. They are often clustered on new growth. Frost DiebackDon’t prune off the frost-burned branches until you are sure no further frosts are expected. Street Trees for Cypress Isles August 2001 Jean Thomsin, University of Florida Master Gardener in Orange County. Margins of the leaves are toothed/serrated. To control, prune out and dispose of infected twigs during the fall and winter. It works by smothering rather than poisoning. I recently planted a Drake elm in my backyard. Has Evergreen to Partly Deciduous foliage. Wetwood can occur. The Drake Elm Tree is a very fast growing tree that quickly provides a shady cover when planted along public sidewalks that is dense and quickly grows in width and height, forming an umbrella shaped canopy, and the fall leaf color of the Drake Elm tree is brilliant gold, and the small leaves practically disappear in the grass that means the raking is not a big problem. This tree is a Chinese elm and drake is a popular cultivar widely used in the area. Diseases. This past week the tree has been getting a lot of yellow leaves and the last two days the yellow leaves are doubling and falling off. How to Care for an Elm Tree. Foliage in autumn often turns shades of I have a question about Drake Elm trees in central Florida (50 miles north of Orlando). Over time, natural selection produced elms resistant to Dutch elm disease. Sprinkle plants in the mid-afternoon when most spores are formed; this allows plants to dry before nightfall, reducing the likelihood that sprinkling will promote other diseases. First reported in the U.S in 1928, the disease is believed to have been brought over from the Netherlands in a shipment of logs. If aphids are causing sufficient damage to warrant further treatment, or if washing with plain water has not worked, we suggest one of two insecticides. The stately American elm tree was a popular shade tree before Dutch elm disease devastated it. Also called the Drake elm and the lacebark elm, these beautiful trees can be among the first to green up in the spring and the last to turn colors in the fall, long after most other trees have submitted to the season. We have a problem with the cold weather killing our grass. Chinese Elm Tree Leaves. The leaves of other elms, like are the Winged Elm, the Rock Elm, and the Cedar Elm are smaller in size. Know your pest. Also called lacebark elms or drake elms, Chinese elm trees grow to between 33 and 60 ft. (10 – 18 m) tall. When your Chinese elm displays yellow leaves, you need to act quickly because this is a sign of two potentially severe disease problems. — Lori Hébert & Thaddeus Homan, Copyright © 2020 Friend of the Urban ForestPrivacy Policy | Terms & Conditions | Site MapWebsite by MIGHTYminnow, Silliman and Woolsey streets win San Francisco’s “Most Greenified Block”, Shafter Ave wins San Francisco’s “Most Greenified Block”, Friends of the Urban Forest to Launch Large-Scale Tree Planting in the Excelsior, Tenderloin wins San Francisco’s “Most Greenified Block”, Ney Street “Neyborhood” wins annual “Most Greenified Block” award, Save Our Water and Our Trees! In rare cases of frost, some plants will partially or fully die back. Look for curled green leaves and/or wilted buds. It is good to be aware of this disease and take preventative action if you have susceptible trees. Ulmus parvifolia (Chinese Elm): Deciduous tree; excellent, fast growing, durable; disease and insect resistant; drought tolerant; grows to height of 45 ft. and a spread of 25 ft.; foliage is dark, lustrous green turning to shades of gray, green, orange and brown; useful as street trees … Branches can break when stressed with snow, ice, or wind. Bill Pramuk is a registered consulting arborist. What are the risks to you or the environment around you. In politics. Example image.Iron deficiency Wind is drying, so try increased watering if the soil drains well. Shot Hole Fungus affects Prunus species such as plum, almond and apricot. In rare cases of frost, some plants will partially or fully die back. A Classic, Beautiful Shade Tree for the Golden State Why Drake Elm Trees?Known for its adaptability and ease, the Drake Chinese Elm Tree boasts a moderately fast but manageable growth rate, stunning shape and nearly-evergreen foliage. It’s available online or by phone at 800-994-8849. We actually want some aphids in order to sustain the predators so they can reproduce to eat more aphids! The outer foliage is keeping the inner foliage warm. Cankers may develop on young trunks where soil is excessively wet. For more information, call 415-661-1316 x354. Drake elms are beautiful trees but have the potential to grow 35-45 feet tall and wide so they are not good specimens for small yards. A fast-growing, deciduous or evergreen tree, Chinese elm forms a graceful, upright, rounded canopy of long, arching, and somewhat weeping branches which are clothed with one to two and a half-inch-long, shiny, dark green leaves. Anthracnose — derived from “coal” and “malady” — has classic symptoms on Chinese elms: dark spots on new leaves, which fall from the trees in spring. Adding organic nitrogen fertilizer on a regular basis can help – but don’t overdo it. 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