endstream endobj 18 0 obj <> endobj 19 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 20 0 obj <>stream Cottonwoods (Populus deltoids) are massive shade trees that grow naturally throughout the United States. It is one of the largest of some 40 species of Populus and is the tallest, fastest-growing hardwood in the western United States. Leaf scorch. During moist weather, reddish threads of fungus spores ooze from pimple-like fruiting bodies on cankered areas. Especially aggressive rooted species include the white poplar (P. alba), a 100-foot-tall tree with a wide crown and dark foliage, and the cottonwood (P. heterophylla), a native tree that grows naturally in flood plains and has water-seeking roots. As noted earlier the wood is soft and is susceptible to borers, caterpillars, aphids and other diseases. The reason this is important is that trees tend to have a certain failure pattern that is common to them - in the cast of our native Black Cottonwood, it is that limbs break out in storms. Leaf infection precedes twig or stem infection. Trees can out-grow a small yard in no time at all, see photos. Cottonwood trees (Populus deltoides) are fast-growing, majestic trees that grow well in U.S. Department of Agriculture plant hardiness zones 3 through 9. 3.25-Gallon Cottonless Cottonwood Shade Tree in Pot (L3624) Item #99561 Model #NURSERY. Leaf spot diseases should be taken seriously if they result in moderate to complete leaf loss two to four years in a row. Also, the seeds may contribute to allergic reactions. WebMD explains which trees cause the most problems and how you can keep your tree pollen allergy symptoms under control. Cytospora Canker (fungus – Cytospora chrysosperma): Primarily affects weak trees and occurs mainly on stems. 39 0 obj <>/Filter/FlateDecode/ID[<69E904ECD0B42242BF2CCAFB5EA2AE3A><959B3C10AA473F42BFBE764E8DC71997>]/Index[17 38]/Info 16 0 R/Length 108/Prev 224908/Root 18 0 R/Size 55/Type/XRef/W[1 3 1]>>stream A unique education agency, the Texas A&M AgriLife Extension Service teaches Texans wherever they live, extending research-based knowledge to benefit their families and communities. Crown Gall (bacterium – Agrobacterium tumefaciens): This organism has been reported to cause branch and root galls on cottonwood in Texas. City urban forester Gary Garner points out parts of a cottonwood tree that are damaged or weakened, like this split that was caused by lightning. Cottonwood Tree Problems Cottonwood trees are not the ideal type of landscaping tree for small or medium-sized backyards. Four different fungus rots affect the cottonwood tree. Damage is usually not serious enough to warrant control measures, but fungicides can be used on valuable trees. Because cottonwood trees are adapted to thrive in floodplains, they naturally have shallow root systems, so that as floodwaters recede, the roots can breathe and the tree survives. During springtime, these seeds cause serious litter problems, by almost entirely covering large stretches of ground. The winter buds are slender, pointed, 1–2 cm ( 1⁄2 – 3⁄4 in) long, yellowish brown, and resinous. It also has a weak wood structure. They also have aggressively growing roots; don't plant one near a sewer system, building foundation, paved area or other site where its roots may cause problems. It is native to eastern North America through the Midwest and Chicago region. Populus deltoides is a large tree growing to 20–60 m (65–195 ft) tall and with a trunk up to 2.8 m (9 ft 2 in) diameter, one of the largest North American hardwood trees. 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