It is caused by a non-native, invasive fungus (Bretziella fagacearum, formerly Ceratocystis fagacearum). Oak wilt: Most oaks but especially red oaks are susceptible. Usually there is more rainfall as well (Note: if rainfall is scarce in your area, see "Water Wisely" under. Crab apples (Malus selections) are some of the easiest and most beautiful trees to grow, if you choose a disease-resistant variety with persistent small fruits that won't make a mess when they fall. He's searched eastern North Dakota and western Minnesota for disease resistant elm trees. Choosing resistant varieties will reduce the odds of getting a disease. Many of these latter types are used only occasionally in shade and ornamental plantings, a fact that may account for the general absence of dis-eases. Zone down to 3. And these trees are even insect resistant, meaning you can grow your peaches organically. Commendation™ – Hybrid of Accolade, Siberian elm, and the European field elm (U. minor). Two Asiatic cultivars are Accolade® (Ulmus 'Morton', height 50 ft, spread 40 ft) and Triumph™ (U. By the 1970s, when the disease made it to St. Paul, about 95% of the trees some cities planted in boulevards and rights of way were elm trees. Cultivars are often rated highly resistant, somewhat resistant or susceptible to common apple diseases such as scab, fireblight, leaf spot and rust. Detailed information about elm varieties that grow well in Minnesota can be found in the publication Dutch elm disease-resistant trees. An improved variety of Lombardy Poplar that is more disease resistant and longer lived. Typical of the members of the legume family, it’s tough as nails, can live in very poor (but well-drained) soil and still look good. Variety. Plant 5-6' apart for screening, windbreaks and backgrounds. We graft apples trees on various semi-dwarf (M26, M7, and M111) and dwarf (Bud9, P2, G41, G214, and G935) rootstocks. Some trees show resistance to certain of the more serious tree diseases. Tolerance. Sometimes it is a major outbreak, like Dutch Elm Disease, that decimates a much-loved tree. Colorado blue spruce (Picea pungens) is no longer recommended for Minnesota landscapes due to its susceptibility to several debilitating spruce diseases, most specifically Rhizosphaera needle cast and Cytospora canker. Did this mean no more elm trees in our urban forest? Since 1999, the University of Minnesota has been evaluating, selecting and screening elms for use in Minnesota. Cathedral – Vase-like shape, with good resistance to elm leaf beetle and other leaf cutting insects. Yes, a silver maple! Like all maples, shallow roots are still an issue. Classic vase-shaped American elm with outstanding autumn gold color. These DED-resistant elms add to the array of tree species that can be planted in the upper Midwest, contributing to greener and cooler communities throughout Minnesota. In addition to disease resistance, these elms tolerate urban stress and are adapted to a wide range of soil conditions. Until recently, Juglans cinerea (butternut) was a fairly common forest tree in the eastern half of the United States and Canada. Samuel B. Sunlight is less intense and temperatures are cooler which reduces transplant stress. Disease resistant and drought tolerant, reaches 15-20 feet with similar spread. Winter hardy to USDA Zone 3, as well as stress and drought tolerant. Unfortunately, J. cinerea is very susceptible to butternut canker (Sirococcus clavigignenti-juglandacearum), a lethal fungal disease of unknown origin. The peak of the spread was 1977, when the metro lost more than 190,000 elms. Crab apples ( Malus selections) are some of the easiest and most beautiful trees to grow, if you choose a disease-resistant variety with persistent small fruits that won't make a mess when they fall. Yellowish green skin with an orangish red flush and darker stripes. (Cornus Kousa) 20-30' Anthracnose resistant white flowers in spring followed by raspberry like fruit. were, in fact, unfortunate delaying activities that interfered with proper. However, back in the late 60’s and early 70’s, arborists started removing thousands of dead elms, including my Detroit, Michigan street tree. Disease tolerant bushes, or shrubs, and trees tolerate the presence of certain pathogens and fungi that kill and damage other plants. 2020 Rootstocks. The fungus invades the water-conducting vessels of oaks, eventually killing infected trees. The University of Minnesota is an equal opportunity educator and employer. These elms are a series of new trees cloned by the University that show promise to be resistant to a deadly disease that has killed thousands of elm trees that traditionally line the boulevards and parks around the Twin Cities. On tagged trees offered for sale look for the words "resistant" or "highly resistant." Others are relatively free from major disease problems under growing conditions found in the Northeast. Accolade™ – Smaller at maturity but similar to the typical American elm form. Shop for locally-grown trees as they will adapt to and perform well in their new surroundings. Scabby fruit are often unfit for eating. Danada Charm™ – Fast growing upright hybrid. The ginkgo has much to recommend it, including resistance to pests, diseases, and urban pollution, so its recommended that you go ahead and plant it—just avoid the female plants. But some don’t. Dutch elm disease-resistant elm trees. The major diseases to be concerned about are apple scab and fire blight. Many Dutch-elm resistant cultivars are hybrids of Asian elms. What made Dutch elm disease so devastating is how popular elms have always been. ‘Prairie Fire’ crab apple, for instance, is resistant to scab, fire blight and Japanese beetles. medium to small graceful white birch. Patton initially discovered and investigated the waxy deposits that make the tree exceptionally resistant to blister rust. Most often it is a lower-level disease that picks away at a particular type of tree, like the Verticillium Wilt that is spreading through maple trees these days. 2Insect resistance recommendations are based on observations at the University of Minnesota, the Morton Arboretum and previously published works. The flowers range from a dark burgundy color to creamy white. University of Minnesota Extension discovers science-based solutions, delivers practical education, and engages Minnesotans to build a better future. Height: 50-70 ft. It will succumb to bronze birch borer, so keep it well-watered, plant in a garden bed to avoid compacted soil, and mulch the root zone. Many native elm trees are being tested in Minnesota and North Dakota in an effort to find cultivars that are resistant to Dutch elm disease. Triumph™ – More upright in form than Accolade, but slightly less insect resistance. the best disease resistance of crabs with deep purple leaf color. New Harmony – A USDA selection that appears to have superior form when compared to Princeton and Valley Forge. Over the last 100 years there have been dozens of American elm selections. Plant different varieties of trees in your landscape to help create a sustainable ecosystem. Cultivars are often rated highly resistant, somewhat resistant or susceptible to common apple diseases such as scab, fireblight, leaf spot and rust. Once widely planted and used for its form, shade and incredible urban tolerance, the American elm succumbed to Dutch elm disease (DED), spreading rapidly by elm bark beetles and root grafts between elm trees. In the case of elms, a small investment in maintenance during the "formative years" will have a huge payoff when they are approaching maturity. Jefferson American Elm vs. Princeton American Elm . While the following list of recommendations doesn’t. Redosier dogwood is native to Minnesota with colorful red or yellow winter bark. Ripens with Delicious. The trees are vigorous, spreading and very productive. Concolor fir (Abies concolor) and some white spruce are good large tree alternatives with blue-green foliage to Colorado spruce. Looking for the perfect tree to fill out an open space in your landscape? For more information on the blight resistance of these trees, please see the "More Info" tab below. By the 1970s, when the disease made it to St. Paul, about 95% of the trees some cities planted in boulevards and rights of way were elm trees. Help do your part to return this native species to glory! Winter hardy to USDA zone 3. Many of the trees that we sell are disease resistant when placed in the proper area and planted properly. Disease-Resistant Elm Identification Guide. Hardy to zones 4-9. Fortunately, many diseases require no treatment. Standard size pear trees should be planted 20 feet apart and dwarf varieties should be 15 feet apart. Several times each growing season, observations have been made of these plantings of the variety with respect to growth, form, resistance to disease and resistance to insects. It’s worth the extra work. Look for apple cultivars that show resistance to apple scab, cedar apple rust, fire blight, and powdery mildew. Wrap the stems/trunk with a collar or hardware cloth available at garden centers to protect them. No more harsh chemicals or sprays. Department of Plant Pathology | 495 Borlaug Hall 1991 Upper Buford Circle | St. Paul, MN 55108 (612) 625-8200 | Fax: (612) 625-9728 | plpath@umn.edu No control is recommended. 25' 20' 3 Broad, rounded crown Red-purple when young, maturing to green Deep red buds, single deep pink flowers Bright red, 1/ 2" Poor Excel. Black chokeberry provides fruit for wildlife well into the winter. Yellow fall color. Dutch elm disease-resistant elms. The "best" tree is a very subjective decision and disease resistance is relative. Infected leaves have olive green to brown spots. Homeowners in The Land of 10,000 Lakes are looking for types of trees that are fast-growing, hardy, and are perhaps even native. Important information on blight resistance: Once an important hardwood timber tree, nearly 4 billion American Chestnut trees were nearly wiped out between 1900 and 1940. A cultivar of our native, this silver maple is very well built, site tolerant and about ⅔ the size of the species at maturity. In contrast to the summer diseases, control of insect pests on disease-resistant apple cultivars may require trapping, mating disruption or insecticide application. Oak wilt is deadly disease that affects all species of oaks (Quercus) found in Minnesota. ‘Morton Glossy’, height 60 ft, spread 40 ft). The disease was first reported in Wisconsin in 1967 (Renlund 1971) and reached southeastern Minnesota in the 1970s. Bur oaks die between one and seven years after infection, while white oak… Serviceberry, or juneberry, is a shrub or small tree native to Minnesota. The Best Trees for Planting in Minnesota . Sourwood (Oxydendrum arboreum) 40' Wonderful fall color, bell shaped white … By inspecting leaves and trunks, and looking for dead branches, you can figure out what ails your oaks. Forget spraying harsh chemicals...learn more about our Disease Resistant Plants & Trees today! Disease Tolerant Bushes & Trees. Flowers of this ... A hardy University of Minnesota introduction, this tree resists fireblight and performs well in the Rocky Mountain and inter-mountain states. Many of these elms require considerably more pruning and training than other landscape trees, and the first 15 years often determine how they will perform for the remainder of their lives. Knowing when and how much to prune and maintain trees requires experience, so if you are not sure how to work on young elms, contact an experienced tree care professional to get you started right. 2. The fungus enters the tree through wounds or scars. Strong resistance to insects such as elm leaf beetle. The trees were planted at a spacing of 10×10 meters which enhances canker infection and provides greater selection pressure to identify resistant trees. Some dimensions are estimated and will vary greatly and may be influenced by site conditions and maintenance, especially pruning. A unique book of notes on Minnesota’s 19th century apple varieties was recently digitized and published by the University of Minnesota Libraries Publishing, and it has provided apple breeders and enthusiasts a fascinating glimpse into Minnesota’s apple heritage. Butternut canker is a fungal disease of Juglans cinerea, the butternut tree (also known as white walnut or oilnut). The best Minnesota tree choices will include trees that will easily adapt to Minnesota’s climate conditions, along with demonstrating exceptional drought-resistance as well as mildew, insect and disease resistance. Here is a list of our favorite trees based on size, color, leaf characteristics and insect/disease resistance. Leaf loss weakens the tree when it occurs many years in a row. 3-4' trees shipped. more info. Hardy in Zones 3a-7. The University of Minnesota is an equal opportunity educator and employer. The disease is thought to have originated outside of the U.S. More Info . Prefers moist well drained soil, but is tolerant of drought. Andy likes ‘Adirondack' with its strongly upright branching for smaller spaces. Available in most garden centers and also through mail-order. Apple scab is the most common disease of apple and crabapple trees in Minnesota. 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