{"id":21375,"date":"2015-03-17T13:55:35","date_gmt":"2015-03-17T17:55:35","guid":{"rendered":"http:\/\/www.fondriest.com\/news\/?p=21375"},"modified":"2021-11-10T16:41:23","modified_gmt":"2021-11-10T20:41:23","slug":"emerald-ash-borer-a-prolific-invader-has-spread-to-a-new-tree","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/emerald-ash-borer-a-prolific-invader-has-spread-to-a-new-tree.htm","title":{"rendered":"Emerald ash borer, a prolific invader, has spread to a new tree"},"content":{"rendered":"<p>In 2002, Detroit was ground zero for the emerald ash borer invasion, as the shiny green beetle pushed its way in on poorly treated wood packing material that carried goods from eastern Europe and Asia. The bugs were probably dormant larvae at that time, resting until conditions were right to chew their way out.<\/p>\n<p>And when they did, it wasn\u2019t long before they found ash trees like those they loved in Asia right here in the United States. They preyed on the trees near Detroit first, and from there expanded into untouched territories including Illinois, Indiana and Ohio. Within a decade, emerald ash borers were found in much of the U.S. Midwest and Northeast, all the way from Kansas to New Hampshire.<\/p>\n<p>That the emerald ash borer can spread quickly isn\u2019t surprising. What is, however, is the way they do it. The beetles can\u2019t expand that rapidly on their own, and only extend their range by about a kilometer per year naturally. But when people don\u2019t treat wood by spraying it with pesticides or drying it out, emerald ash borers can make huge geographic leaps, like their emergence in Denver that came out of nowhere and other sightings in Arkansas and Louisiana.<\/p>\n<p>Unfortunately for those trying to stop the expansion of this resourceful invasive species, emerald ash borers have been found in a new tree: white fringetree, a close relative of ash. That discovery was made by Don Cipollini, professor of biological sciences at Wright State University.<\/p>\n<div id=\"attachment_21365\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-21365\" class=\"size-full wp-image-21365\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2015\/03\/emerald_incubator.jpg\" alt=\"Don Cipollini pulls tree samples out of an incubator in his lab. Strips holding emerald ash borer eggs are applied to each one to see which tree species the insect can live in. (Credit: Daniel Kelly)\" width=\"600\" height=\"400\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2015\/03\/emerald_incubator.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2015\/03\/emerald_incubator-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-21365\" class=\"wp-caption-text\">Don Cipollini pulls tree samples out of an incubator in his lab. Strips holding emerald ash borer eggs are applied to each one to see which tree species the insect can live in. (Credit: Daniel Kelly)<\/p><\/div>\n<p>\u201cThey had tested the leaves of this tree early on for suitability of the adults because adults feed on the leaves. But that\u2019s not a big issue; it\u2019s what the larvae feed on that\u2019s really damaging,\u201d said Cipollini during an interview in his lab. \u201cFor some reason, that step was never examined back then. And that lingered in my mind, this question about white fringetree.\u201d<\/p>\n<p>Luckily for Cipollini, who lives near Yellow Springs, Ohio, one of the trees was growing right in his backyard. From there, he started to look around the Dayton area in 2014 to find where other white fringetrees were planted. There were about 10 in public areas around Yellow Springs, as well as a few others in private yards.<\/p>\n<p>\u201cSo I just said, \u2018This summer, this is the summer I\u2019m going to go out and address that question: Is emerald ash borer using this species in the field?\u2019\u201d said Cipollini. \u201cI just simply went out, starting from one end of the Little Miami Bike Trail in Yellow Springs examining the trees, just visually, and inspecting the trees for evidence of an attack.\u201d<\/p>\n<p>The telltale signs of an emerald ash borer attack include dried and shrunken stems with D-shaped holes where adults have chewed their way out. Cipollini also noted cracked bark and signs that trees were dying back, like epicormic sprouting: new stems sprouting at points below the attack sites to compensate.<\/p>\n<p>The first few white fringetrees that he checked looked unattacked.<\/p>\n<p>\u201cSo I\u2019m three trees in, thinking maybe there\u2019s nothing to this,\u201d said Cipollini. \u201cThen I walked up to the fourth tree.\u201d<\/p>\n<p>That white fringetree, hiding in plain sight beside a popular public bike path, was harboring emerald ash borer. Cipollini began collecting evidence to prove his find, and would go on to survey 16 more white fringetrees near Dayton. A total of five of those were found to show signs of emerald ash borer attack, but the very first one was special: It carried a dead adult male that was key to proving the insect was what Cipollini thought it was.<\/p>\n<div id=\"attachment_21368\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-21368\" class=\"size-full wp-image-21368\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2015\/03\/emerald_exit.jpg\" alt=\"A D-shaped exit hole shows where an emerald ash borer has exited this branch of white fringetree. (Credit: Daniel Kelly)\" width=\"600\" height=\"400\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2015\/03\/emerald_exit.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2015\/03\/emerald_exit-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-21368\" class=\"wp-caption-text\">A D-shaped exit hole shows where an emerald ash borer has exited this branch of white fringetree. (Credit: Daniel Kelly)<\/p><\/div>\n<p>\u201cAs this thing dried after I\u2019d collected it, six weeks later I went to look for it, and right in here was a trapped adult,\u201d said Cipollini, pointing to the winding, larvae-chewed feeding gallery where the adult once lay. \u201cI could see it in there. I dug it out and that led to the positive identification of the beetle as emerald ash borer.\u201d<\/p>\n<p>Scientists with the U.S. Department of Agriculture\u2019s Animal and Plant Health Inspection Service gave their official stamp of approval on Cipollini\u2019s findings. It was the beginning of a whirlwind of additional study, traveling, presentations and conferences to discuss his findings, in addition to publishing his results in the Journal of Economic Entomology.<\/p>\n<p>\u201cI don\u2019t think people were looking, frankly. It could have been anybody that decided to do this,\u201d he said. \u201cIt just happened to be me.\u201d Another factor that may have slowed the discovery is the fact that many trees don\u2019t show visible signs of attack until it\u2019s too late.<\/p>\n<p>Cipollini\u2019s hypothesis is that white fringetrees are a good target for emerald ash borers because they share similar chemical signatures that ash borers can key in on. The trees are among the most closely related trees to ash in North America even though they don\u2019t look like them.<\/p>\n<p>The similarities between the two trees brings up another question: Could emerald ash borers spread to other closely related trees? After all, both ash and white fringetree are members of the olive family, says Cipollini.<\/p>\n<p>Unfortunately, the answer could be yes. If white fringetree is susceptible, then other trees in the olive family that look and smell just like it may be too. Trees like the pygmy fringetree, swamp privet, cultivated olive and devilwood.<\/p>\n<p>\u201cSo this type of understanding helps guide what to pay attention to,\u201d said Cipollini, pointing to the closeness of each species on a chart showing similarities between their evolutionary paths. \u201cWhat\u2019s next on the menu? That\u2019s the reason for the focus on these species over here. If this one can be attacked, then it\u2019s quite possible that this one and this one, and so forth, can be too.\u201d<\/p>\n<div id=\"attachment_21367\" style=\"width: 610px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-21367\" class=\"size-full wp-image-21367\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2015\/03\/emerald_barrel.jpg\" alt=\"Don Cipollini opens a rearing barrel holding borer-infested white fringetree. If the borer larvae grow into adults, they will try to escape and get caught in the clear container on top. (Credit: Daniel Kelly)\" width=\"600\" height=\"400\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2015\/03\/emerald_barrel.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2015\/03\/emerald_barrel-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-21367\" class=\"wp-caption-text\">Don Cipollini opens a rearing barrel holding borer-infested white fringetree. If the borer larvae grow into adults, they will try to escape and get caught in the clear container on top. (Credit: Daniel Kelly)<\/p><\/div>\n<p>Cultivated olives are important economically for fledgling olive industries in Florida and well-established ones in California. And, of course, olives aren\u2019t just grown in the U.S. Growers in Europe may have to be on the lookout for ash borers in the future.<\/p>\n<p>Cipollini believes the emerald ash borer will make it to Europe eventually (it is in Moscow right now), much the same way it made landfall in Detroit. And as the insect\u2019s effects have already been felt here in the U.S., Europe will have to deal with them too.<\/p>\n<p>The ecological damage is also important. If borers attack and kill white fringetree like they do ash, they\u2019re removing another tree that pollinators visit. \u201cBees and other insects service these flowers and obviously they make these olive-like fruits in the fall that birds eat, mammals eat,\u201d said Cipollini. \u201cSo there\u2019s this wildlife value to the plant that would be affected if it gets killed back.\u201d<\/p>\n<p>But before that scenario plays out, Cipollini says more investigation needs to be done to understand how the beetle is making its moves. Uncovering that will help regulators like those at the USDA Animal and Plant Health Inspection Service plan for minimizing the damage.<\/p>\n<p>To get at the question, Cipollini\u2019s lab is equipped with\u00a0rearing barrels that hold borer-besieged white fringetrees he found during his studies. By simply bringing the infested trees into his room-temperature lab, he is speeding up the ash borer development process and can see if live adults emerge from them or not.\u00a0There is also an incubator that holds branches from several tree species believed to be at risk, each bound with\u00a0small strips of ash borer eggs. In a work related to the initial discovery, he\u2019s monitoring which tree species ultimately provide livable environments by checking for feeding galleries that hatching larvae leave behind.<\/p>\n<p>So far, he has confirmed white fringetree is an acceptable host for emerald ash borer larvae. And so is devilwood, which supported the development of a few larvae. In green ash, he found that larvae appeared to grow faster than in white fringetree, but with similar numbers of surviving larvae.\u00a0<span style=\"line-height: 1.5;\">The results were different for a species of Chinese fringetree, which did not support larvae growth. Cipollini says that the tree may have a shared evolutionary history with the emerald ash borer in Asia and possess effective defenses against it. And more work is planned on olive trees, with Cipollini sourcing stems from California for study.<\/span><\/p>\n<p>He has also continued his legwork around Yellow Springs, uncovering four more white fringetrees that have been affected. And he conducted similar surveys at the Morton Arboretum outside Cincinnati, where he&#8217;s found about half of\u00a020 white fringetrees there have been attacked.<\/p>\n<p>The full results of his second investigation are slated to be published soon in the journal Environmental Entomology.<\/p>\n<p>&#8220;What I&#8217;ve learned is that, more or less, these trees (white fringetrees), they&#8217;ll all get attacked when beetle densities get high enough,&#8221; said Cipollini, while walking along the bike trail in Yellow Springs. &#8220;It doesn&#8217;t mean they&#8217;ll die of it, but I think they&#8217;re all gonna get tested.&#8221;<\/p>\n<p><em><span style=\"color: #808080;\">Top image:\u00a0Tree samples sit in an incubator in Cipollini\u2019s lab. (Credit: Daniel Kelly)<\/span><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A Wright State scientist\u2019s detective work and luck found emerald ash borer attacking new species. But the discovery is just the beginning of his work.<\/p>\n","protected":false},"author":13,"featured_media":21364,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,5],"tags":[345,209,60,119,176,205],"class_list":["post-21375","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-atmosphere","category-featured-articles","tag-earth-atmosphere","tag-em-on-location","tag-featured","tag-invasive-species","tag-top-story","tag-wright-state-university"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Emerald ash borer, a prolific invader, has spread to a new tree<\/title>\n<meta name=\"description\" content=\"A Wright State scientist\u2019s detective work and luck found emerald ash borer attacking new species. 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