{"id":6131,"date":"2016-01-12T12:00:53","date_gmt":"2016-01-12T17:00:53","guid":{"rendered":"http:\/\/www.whatgrowsthere.com\/grow\/?p=6131"},"modified":"2015-10-22T14:15:31","modified_gmt":"2015-10-22T18:15:31","slug":"tree-diversity-important-in-urban-parks-and-streets","status":"publish","type":"post","link":"https:\/\/whatgrowsthere.com\/grow\/2016\/01\/12\/tree-diversity-important-in-urban-parks-and-streets\/","title":{"rendered":"Tree Diversity Important In Urban Parks And Streets"},"content":{"rendered":"
\"Blue<\/a>

Blue ash (Fraxinus quadrangulata) at East TN State University Arboretum in Johnson City, TN<\/p><\/div>\n

\"Young<\/a>

Young Princeton elm (Ulmus Americana)<\/p><\/div>\n

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In recent years urban tree diversity has become a buzz topic. The threat of losing entire street plantings to a deadly exotic disease or pest has to often become the reality. Nearly a century ago, urban tree-lined thoroughfares were laid bare\u00a0by losses of American elms (Ulmus americana<\/em>) and chestnuts (Castanea dentata<\/em>) to Dutch elm and chestnut blight diseases respectively.<\/p>\n

Thousand cankers disease (TCD) is a disease complex currently threatening millions of black walnut (Juglans nigra<\/em>) trees in forests and urban areas. TCD is the result of the combined activity of a fungus and walnut twig beetle.<\/p>\n

Asian long-horned beetle continues to kill tree populations in several Mid-Atlantic and Midwest states. It is an invasive wood-boring insect that attacks hardwood trees, including maple (Acer spp<\/em>.), birch (Betula spp<\/em>.), beech (Fagus spp<\/em>.), poplar (Populus spp<\/em>.),\u00a0and elm (Ulmus spp<\/em>.).<\/p>\n

Emerald ash borer is\u00a0destroying native and European ash (Fraxinus spp<\/em>.) across the U.S. and around the world. Oak wilt disease is laying ruin to oaks (primarily\u00a0the “black oak” species) in several states.<\/p>\n

Norway maple\u00a0has been widely used on residential streets because it is a long -lived attractive tree, and\u00a0holds up to\u00a0soil compaction and air pollution. Unfortunately, this non-native\u00a0maple is weedy, producing abundant seeds\u00a0which\u00a0invade native woodlands and aggressively compete\u00a0with\u00a0native plants.<\/p>\n

Tree scientists are keen about Shantung or Purpleblow maple (Acer truncatum<\/em>). It\u00a0has an attractive appearance, but does not propagate well (USDA hardiness zones 4 – 8). This Asian maple species grows 25 – 30 feet tall and wide, is\u00a0exceptionally heat and drought tolerant, and adapts to either\u00a0full sun or moderate shade. Hybrid cultivars like Norwegian Sunset\u00ae and Pacific Sunset\u00ae exhibit exceptional heat and drought tolerance, good disease and pest resistance,\u00a0and boasts bright red fall leaf color.<\/p>\n

\"'Norwegian<\/a>

‘Norwegian Sunset’ maple (photo from J. Frank Schmidt Nursery)<\/p><\/div>\n

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              In recent years urban tree diversity has become a buzz topic. The threat of losing entire street plantings to a deadly exotic disease or pest has to often become the reality. Nearly a century ago, urban tree-lined thoroughfares were laid bare\u00a0by losses of American elms (Ulmus americana) and […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1269,1082,1111,965,650,674,879,816,1154,616,627,1084,1174,469,630,7],"tags":[],"_links":{"self":[{"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/posts\/6131"}],"collection":[{"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/comments?post=6131"}],"version-history":[{"count":6,"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/posts\/6131\/revisions"}],"predecessor-version":[{"id":8222,"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/posts\/6131\/revisions\/8222"}],"wp:attachment":[{"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/media?parent=6131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/categories?post=6131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/whatgrowsthere.com\/grow\/wp-json\/wp\/v2\/tags?post=6131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}