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<div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/A27.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Invasive Fruit Tree Reported Across the US' data-article-id='6083'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='9688'>In the early 1900s, the U.S. Department of Agriculture (USDA) requested an order of Callery pear tree seeds from China. </span> <span data-start-time='9688' data-end-time='27667'>The agency hoped the seeds might be a solution for a bacterial disease harming American pear production.</span> <span data-start-time='27667' data-end-time='38771'>Today, however, experts from the USDA are studying the best ways to kill Callery pear trees. </span> <span data-start-time='38771' data-end-time='45396'>The flowering fruit trees have become aggressive, invasive plants.</span> <span data-start-time='45396' data-end-time='63375'>University of Cincinnati researchers Theresa M. Culley and Nicole A. Hardiman wrote about the plant’s history in 2007 for the publication BioScience. </span> <span data-start-time='63375' data-end-time='76604'>They said that, in the early 1900s, a bacteria called fire blight was badly hurting the production of pears in the U.S. </span> <span data-start-time='76604' data-end-time='92563'>Scientists discovered that combining a pear tree that produced the edible fruit with the Callery pear tree created a specimen that could survive the bacteria.</span> <span data-start-time='92563' data-end-time='103563'>Over the years, 25 different kinds of ornamental trees were created from this combination. </span> <span data-start-time='103563' data-end-time='108958'>The well-known Bradford pear tree was one of them. </span> <span data-start-time='108958' data-end-time='118188'>All of them were able to survive difficult conditions and were planted across the United States.</span> <span data-start-time='118188' data-end-time='130313'>In 1971, the U.S. Department of Agriculture even created a small publication about their care. </span> <span data-start-time='130313' data-end-time='142042'>The agency described them as trees that flower several times during the year and do well in many climates and soils.</span> <span data-start-time='142042' data-end-time='150063'>That ability to survive easily is part of what makes the trees invasive.</span> <span data-start-time='150063' data-end-time='157146'>Seeds from the inedible fruit that the trees produce can spread easily. </span> <span data-start-time='157146' data-end-time='163021'>In addition, the roots can produce above-ground growth. </span> <span data-start-time='163021' data-end-time='174396'>If the growth is not cut down often to stop it from flowering, it can create a fertile seed with the rest of the tree.</span> <span data-start-time='174396' data-end-time='189688'>It is possible for a wild population to come from a single tree that someone plants on their property, said Culley, one of the University of Cincinnati researchers.</span> <span data-start-time='189688' data-end-time='204229'>Callery pear trees are the third most common kind of tree planted along New York City streets, said city parks department spokesman Dan Kastanis.</span> <span data-start-time='204229' data-end-time='209917'>But the city is no longer planting them, Kastanis said. </span> <span data-start-time='209917' data-end-time='223438'>Cities in Virginia, South Carolina, Ohio, and Indiana have also banned or are banning the sale of all kinds of Callery pear trees.</span> <span data-start-time='223438' data-end-time='239750'>Some states, including Missouri and Alabama, are asking homeowners and landowners to stop planting them or to cut existing ones down and use chemicals on what remains. </span> <span data-start-time='239750' data-end-time='255021'>Other states, including North Carolina, are offering free native trees to landowners who show photographic evidence that they have cut down Callery pears on their property.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/5520/A27.jpeg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=18551 data-hint-location='76604' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/which_of_the_following_is_a_definition_of_the_term_edible.wav'>Which of the following is a definition of the term edible?</div><div class='choices' data-correct-choice='suitable or safe to eat'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/clear_and_able_to_be_read.wav'><span>clear and able to be read</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/suitable_or_safe_to_eat.wav'><span>suitable or safe to eat</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/having_a_transparent_shade.wav'><span>having a transparent shade</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/legitimate.wav'><span>legitimate</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=18552 data-hint-location='27667' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/what_type_of_fruit_tree_is_this_article_about.wav'>What type of fruit tree is this article about?</div><div class='choices' data-correct-choice='pear'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/plum.wav'><span>plum</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/cherry.wav'><span>cherry</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/apple.wav'><span>apple</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/pear.wav'><span>pear</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=18553 data-hint-location='142042' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/that_ability_to_survive_easily_is_part_of_what_makes_the_trees__blank_.wav'>That ability to survive easily is part of what makes the trees <span class='blank'>invasive</span>.</div><div class='choices' data-correct-choice='invasive'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/intermingle.wav'><span>intermingle</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/invalid.wav'><span>invalid</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/explosive.wav'><span>explosive</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5520/invasive.wav'><span>invasive</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button 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