[et_pb_section fb_built=”1″ admin_label=”Header” _builder_version=”4.24.0″ _module_preset=”default” background_enable_color=”off” use_background_color_gradient=”on” background_color_gradient_stops=”rgba(30,77,43,0.6) 0%|rgba(30,77,43,0.6) 100%” background_color_gradient_overlays_image=”on” background_color_gradient_start=”rgba(30,77,43,0.6)” background_color_gradient_end=”rgba(30,77,43,0.6)” background_image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2024\/02\/eab-adult-banner-image-1920×450-min.jpg” collapsed=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”Squiggle – Aligned Left” _builder_version=”4.16″ _module_preset=”default” header_text_align=”center” background_enable_color=”off” custom_padding=”||||false|false” saved_tabs=”all” global_colors_info=”{}”]<\/p>\n\t\t
[\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” text_text_color=”#FFFFFF” header_font=”||||||||” header_text_color=”#FFFFFF” header_font_size=”64px” custom_padding=”||||false|false” header_font_size_tablet=”42px” header_font_size_phone=”32px” header_font_size_last_edited=”on|phone” global_colors_info=”{}”]<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Intro section” _builder_version=”4.24.0″ _module_preset=”default” min_height=”620.3px” global_colors_info=”{}”][et_pb_row column_structure=”1_6,1_6,1_6,1_6,1_6,1_6″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_6″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/04\/colorado-state-university.png” alt=”Colorado State University Logo with Rams Head” title_text=”colorado-state-university” url=”https:\/\/agsci.colostate.edu\/agbio\/ipm-pests\/emerald-ash-borer-4\/” url_new_window=”on” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_6″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2026\/02\/OSU-2.png” alt=”Orange and black text that says Oregon State University and the university beaver logo” title_text=”OSU 2″ url=”https:\/\/solvepestproblems.oregonstate.edu\/invasive\/emerald-ash-borer” url_new_window=”on” _builder_version=”4.27.5″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_6″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/04\/USU.png” alt=”Utah State University Logo” title_text=”USU” url=”https:\/\/extension.usu.edu\/planthealth\/research\/emerald-ash-borer” url_new_window=”on” _builder_version=”4.27.4″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_6″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/04\/MSU.png” alt=”Montana State University Logo” title_text=”MSU” url=”https:\/\/urbanipm.montana.edu\/entomology\/resources\/fact-sheets\/emerald-ash-borer-fact-sheet.html” url_new_window=”on” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_6″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/04\/university-of-wyoming-2.png” alt=”Univeristy of Wyoming logo with Man Riding Horse” title_text=”university of wyoming” url=”https:\/\/www.uwyo.edu\/barnbackyard\/resources\/insects.html” url_new_window=”on” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_6″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/04\/WIPM_logo.png” alt=”Western IPM Center Logo” title_text=”WIPM_logo” url=”https:\/\/westernipm.org\/” url_new_window=”on” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”0px||||false|false” custom_padding=”0px|||||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”0px||||false|false” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
We are proud to have received funding from the Western Integrated Pest Management Center (project CO020<\/a>) to support a Regional Education and IPM Implementation Program focused on managing emerald ash borer in urban landscapes. This website provides up-to-date information relevant to the states involved in our project, with contributions from collaborators at Oregon State University, Utah State University, Montana State University, and the University of Wyoming.<\/strong><\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”2_5,3_5″ _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”0px||||false|false” global_colors_info=”{}”][et_pb_column type=”2_5″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”25px||||false|false” global_colors_info=”{}”][et_pb_text admin_label=”Text” _builder_version=”4.27.4″ _module_preset=”default” text_line_height=”1.4em” header_text_align=”center” header_font_size=”36px” header_2_font_size=”36px” background_enable_color=”off” custom_padding=”||||false|false” saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n [\/et_pb_text][et_pb_button button_url=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2024\/02\/EAB-look-alikes.pdf” button_text=”Insects that resemble emerald ash borer” button_alignment=”left” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”14px” button_text_color=”#FFFFFF” button_bg_color=”#1E4D2B” button_border_width=”4px” button_border_color=”#1E4D2B” background_layout=”dark” global_colors_info=”{}”][\/et_pb_button][et_pb_button button_url=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2024\/02\/Identifying-ash-trees.pdf” button_text=”Identifying ash trees” button_alignment=”left” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”14px” button_text_color=”#FFFFFF” button_bg_color=”#1E4D2B” button_border_width=”4px” button_border_color=”#1E4D2B” background_layout=”dark” global_colors_info=”{}”][\/et_pb_button][et_pb_button button_url=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2024\/02\/EAB-feeding-injuries.pdf” button_text=”Emerald ash borer feeding injuries” button_alignment=”left” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”14px” button_text_color=”#FFFFFF” button_bg_color=”#1E4D2B” button_border_width=”4px” button_border_color=”#1E4D2B” background_layout=”dark” global_colors_info=”{}”][\/et_pb_button][et_pb_button button_url=”https:\/\/www.emeraldashborer.info\/” url_new_window=”on” button_text=”Emerald ash borer information network” button_alignment=”left” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”14px” button_text_color=”#FFFFFF” button_bg_color=”#1E4D2B” button_border_width=”4px” button_border_color=”#1E4D2B” background_layout=”dark” global_colors_info=”{}”][\/et_pb_button][et_pb_button button_url=”https:\/\/solvepestproblems.oregonstate.edu\/invasive\/emerald-ash-borer” url_new_window=”on” button_text=”Oregon EAB invasive species alert” button_alignment=”left” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”14px” button_text_color=”#FFFFFF” button_bg_color=”#1E4D2B” button_border_width=”4px” button_border_color=”#1E4D2B” background_layout=”dark” global_colors_info=”{}”][\/et_pb_button][et_pb_button button_url=”https:\/\/colostate-my.sharepoint.com\/:v:\/g\/personal\/aszczep_colostate_edu\/EaGmREuNfF5JieW2Jkg3LboBvrEUZD1m9S_vycJZrvfohw?e=uBV727″ url_new_window=”on” button_text=”EAB overview: recorded presentation” button_alignment=”left” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”14px” button_text_color=”#FFFFFF” button_bg_color=”#1E4D2B” button_border_width=”4px” button_border_color=”#1E4D2B” background_layout=”dark” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][et_pb_column type=”3_5″ _builder_version=”4.24.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”32px” header_2_line_height=”1.5em” global_colors_info=”{}”]<\/p>\n Emerald ash borer in the west: what to know<\/a><\/p>\n How to identify emerald ash borer and symptoms of infestation<\/a><\/p>\n What to do if you suspect emerald ash borer<\/a><\/p>\n Management and treatment options<\/a><\/p>\n Where to report<\/a><\/p>\n WIPM grant collaborator resources<\/a><\/p>\n Helpful websites and publications<\/a><\/p>\n Please visit the emerald ash borer webpage<\/a> for information on the pest description, life history, and management.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Pest status” _builder_version=”4.27.4″ _module_preset=”default” background_color=”#FFFFFF” min_height=”1284.6px” custom_margin=”-75px||||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” min_height=”718.2px” custom_margin=”-50px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text module_id=”biology-and-importance” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” header_3_line_height=”1.2em” global_colors_info=”{}”]<\/p>\n The emerald ash borer (EAB) is a highly destructive, invasive beetle that targets ash trees. Since its first detection in Michigan in 2002, EAB has spread rapidly across North America, killing tens of millions of ash trees in forests, urban landscapes, and residential areas.<\/p>\n Ash trees are valued in the western United States for their drought tolerance, shade, and ecological benefits. Unfortunately, EAB poses a serious threat to these trees. Larvae tunnel beneath the bark, disrupting the tree\u2019s ability to transport water and nutrients. Without intervention, infested trees typically die within 3 to 5 years.<\/p>\n The consequences of EAB infestation are far-reaching:<\/p>\n Emerald ash borer continues to expand its range across North America. In the western U.S., its presence varies by state:<\/p>\n Early detection and proactive management are critical to slowing its spread and protecting valuable ash tree populations.<\/p>\n To explore EAB\u2019s spread in more detail, several interactive tools are available:<\/p>\n View detections by year on the\u00a0Colorado State Forest Service map<\/a>.<\/p>\n See current detections and quarantine zones on the Oregon Department of Agriculture map<\/a>.\u00a0Oregon also offers a degree-day model<\/a> to predict EAB adult emergence and egg-laying periods, helping guide surveillance and management decisions. A similar tool is also managed by the USA National Phenology Network<\/a>.<\/p>\n For a broader view of EAB\u2019s distribution across North America, visit the EAB Information Network map<\/a>.<\/p>\n These tools are essential for tracking EAB\u2019s movement and planning timely responses in areas at risk.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”-75px||||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” min_height=”241.7px” custom_margin=”-50px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text module_id=”where-western-region” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” global_colors_info=”{}”]<\/p>\n Accurate identification of both ash trees and the emerald ash borer beetle is essential for effective monitoring, management, and prevention of infestation.<\/p>\n Before identifying EAB, it\u2019s important to confirm that the tree in question is an ash. Key characteristics of ash trees include:<\/p>\n For more help, see ash tree ID guides from <\/em>Colorado State University<\/em><\/a> and <\/em>Oregon State University<\/em><\/a>.<\/em><\/em><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash tree leaves” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/5396262-PPT-1-1.jpg” alt=”Green leaves of an ash tree” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Robert Vid\u00e9ki, Doronicum Kft., Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash tree bark” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/Ash-bark.jpg” alt=”Diamond shaped pattern of ash trees” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Paul Wray, Iowa State University, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash tree opposite branching” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/ash-branching-1.jpg” alt=”Ash tree with branches opposite one another” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: City of Aurora, Colorado<\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash tree shape and trunk style” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/Ash-shape-and-trunk.jpg” alt=”Large mature ash tree” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: David Cappaert, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” min_height=”197.7px” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text module_id=”where-western-region” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” global_colors_info=”{}”]<\/p>\n EAB can be identified in both its\u00a0adult\u00a0and\u00a0larval\u00a0stages:<\/p>\n For help distinguishing EAB from similar species, see comparison guides from <\/em>Colorado State University<\/em><\/a> and <\/em>Oregon State University<\/em><\/a>.<\/em><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Adult emerald ash borer” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/03\/EAB-1.jpg” alt=”Emerald ash borer adult on tree bark” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Pennsylvania Department of Conservation and Natural Resources, Bugwood.org<\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Larva of emerald ash borer” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2024\/02\/Larva-EAB-1080×700-min.jpg” alt=”Larva of emerald ash borer” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: David Cappaert, Bugwood.org<\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” min_height=”197.7px” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text module_id=”where-western-region” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” global_colors_info=”{}”]<\/p>\n Early detection is critical. Look for these signs, especially in combination:<\/p>\n Note: These symptoms can resemble those caused by other pests or diseases. Multiple signs together are more indicative of EAB.<\/em><\/p>\n See <\/em>Colorado State University<\/em><\/a> and <\/em>Oregon State University<\/em><\/a> resources for diagnostic photos and further guidance.<\/em><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash trees with canopy thinning” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/canopy-thinning.jpg” alt=”Ash trees with thinning upper canopies” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Ryan Armbrust, Kansas Forest Service, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”S- or serpentine-shaped markings under ash tree bark” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/galleries.jpg” alt=”S-shaped markings under bark of ash tree” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Joseph OBrien, USDA Forest Service, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Epicormic shoots emerging from ash tree trunk” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/epicormic-shoots.jpg” alt=”Growth emerging from trunk of ash tree” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit:\u00a0Pennsylvania Department of Conservation and Natural Resources – Forestry , Bugwood.org<\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Bark splitting on ash tree” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/bark-splitting.jpg” alt=”Split bark on ash tree with emerald ash borer gallery underneath” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Joseph OBrien, USDA Forest Service, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”D-shaped adult exit hole with pencil for scale” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/d-shaped-hole-scale.jpg” alt=”D-shaped exit hole from adult emerald ash borer emerging from ash tree with a pencil for size scale” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Kenneth R. Law, USDA APHIS PPQ, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash tree with woodpecker flecking” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/woodpecker.jpg” alt=”Ash tree with holes from woodpecker feeding” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: David Cappaert, Bugwood.org<\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Distribution” _builder_version=”4.27.4″ _module_preset=”default” background_color=”#FFFFFF” custom_margin=”-75px||||false|false” collapsed=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”-50px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text module_id=”what-should-i-do” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” header_3_line_height=”1.3em” global_colors_info=”{}”]<\/p>\n Before taking action, make sure the tree in question is an ash and that symptoms match those of EAB.<\/p>\n Use identification guides for ash trees<\/a> and EAB feeding injuries<\/a> from Colorado State University and invasive species information<\/a> from Oregon State University.<\/p>\n Refer to the symptoms listed in the How to identify emerald ash borer and symptoms of infestation s<\/strong>ection for visual and behavioral clues.<\/p>\n If you suspect EAB, report it to the appropriate agency in your state:<\/p>\n Contact your local CSU Extension office<\/a>, city or county division of forestry<\/a>, or the Colorado State Forest Service (CSFS)<\/a>.<\/p>\n Report sightings to the Invasive Species Hotline<\/a>.<\/p>\n Reach out to your local extension agent<\/a>, the Schutter Diagnostic Lab<\/a> at Montana State University, or the Montana Department of Agriculture<\/a>.<\/p>\n Contact the Utah Plant Pest Diagnostic Lab<\/a> or the Insect and Pest Program at the Utah Department of Agriculture and Food<\/a>.<\/p>\n Notify your local county extension office<\/a> or the Wyoming Department of Agriculture<\/a>. You may also submit detection information to USDA-APHIS<\/a>.<\/p>\n Once EAB is confirmed, consult a professional to determine the best course of action:<\/p>\n Hire an ISA-certified<\/a> arborist to assess the tree and recommend treatment or removal.<\/p>\n Avoid do-it-yourself removal, especially for large or heavily infested trees\u2014this can be dangerous. Note that canopy dieback of 30% or more means that a tree is no longer safe for an arborist to climb for removal.<\/p>\n If removal is necessary, dispose of wood properly. Shred wood into chips smaller than 1 inch to prevent EAB survival and follow local disposal guidelines to avoid spreading the pest.<\/p>\n <\/span>Boulder County Decision Guide for treatment vs. removal<\/a><\/p>\n Oregon State University Guide to Hiring Pest Control Companies<\/a><\/p>\n Your local extension office can assist with planning and referrals: Colorado<\/a>, Oregon<\/a>, Montana<\/a>, Utah<\/a>, Wyoming<\/a><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash tree with upper canopy dieback” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/03\/EAB-dieback.jpg” alt=”Ash tree in shopping center parking lot with upper canopy dieback due to emerald ash borer damage” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Ada Szczepaniec, Colorado State University<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”D-shaped exit holes” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/D-shaped-exit-holes-2.jpg” alt=”d-shaped exit holes from adult emerald ash borer emerging from ash tree” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Daniel Herms, The Ohio State University, Bugwood.org<\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Ash tree with serpentine galleries caused by EAB larvae” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/11\/EAB-galleries-jpg.webp” alt=”Serpentine carvings on tree due to emerald ash borer” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Edward Czerwinski, Ontario Ministry of Natural Resources, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”EAB adult emerging from tree” image=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2025\/10\/adult-emerging.jpg” alt=”Emerald ash borer emerging from ash tree” _builder_version=”4.27.4″ _module_preset=”default” locked=”off” global_colors_info=”{}”]<\/p>\n Image credit: Jared Spokowsky, Indiana Department of Natural Resources, Bugwood.org<\/span><\/em><\/p>\n [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Distribution” _builder_version=”4.27.4″ _module_preset=”default” background_color=”#FFFFFF” custom_margin=”-75px||||false|false” collapsed=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” background_color=”#FFFFFF” custom_margin=”-50px||||false|false” custom_padding=”27px|||||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text module_id=”homeowner-recommendations” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” header_3_line_height=”1.2em” global_colors_info=”{}”]<\/p>\n EAB is present in parts of the western U.S., making regular monitoring and proactive care essential. Here\u2019s how you can protect your ash trees:<\/p>\n Colorado: Denver Extension<\/a>, City of Fort Collins<\/a>, Colorado State Forest Service<\/a>, Boulder County<\/a><\/p>\n Oregon: Solve Pest Problems<\/a>, Emerald ash borer in Oregon<\/a>, Oregon Invasive Species Council<\/a>, City of Portland<\/a><\/p>\n Montana: Urban IPM EAB site<\/a>, Montana EAB Field Guide<\/a><\/p>\n Utah: Utah State University Extension<\/a><\/p>\n Wyoming: Cheyenne Urban Forestry<\/a>, University of Wyoming<\/a><\/p>\n Before applying any insecticide, consult an ISA-certified arborist to assess your tree\u2019s health and determine the most effective and safe treatment plan.<\/p>\n Multiple studies, including long-term research from Michigan State University (Bick et al. 2017<\/a> and McCullough et al. 2018<\/a>), have shown that\u00a0emamectin benzoate<\/strong>, applied via\u00a0trunk injection<\/strong>, is the most effective insecticide for controlling emerald ash borer. It significantly reduces larvae and exit holes, with protection lasting up to\u00a02\u20133 years<\/strong>, even in high-pressure infestations.<\/p>\n Dinotefuran<\/strong>, applied via\u00a0basal trunk spray<\/strong>, is moderately effective and acts quickly due to its high solubility and fast translocation.\u00a0Imidacloprid<\/strong>, typically applied as a\u00a0soil drench<\/strong>, is less effective\u2014especially for larger trees (over 30 cm DBH) or in areas with many untreated ash trees. Even high-dose applications may result in up to\u00a030% canopy loss<\/strong>.<\/p>\n Azadirachtin<\/strong>, a botanical insecticide, may be useful in low-density infestations. It disrupts egg viability in older females and eventually kills larvae, though its effects are slower and less consistent.<\/p>\n Neonicotinoids like imidacloprid are easier and more cost-effective to apply, particularly as soil drenches, but their performance is inconsistent\u2014especially for larger trees over 30 cm in diameter at breast height (Smitley et al. 2010<\/a>). High-dose applications may offer some protection, yet many treated trees still experience up to 30% canopy loss (Smitley et al. 2015<\/a>). Treatment success is highest when initiated early, repeated at recommended intervals, and when surrounding ash trees are also treated to reduce reinfestation pressure.<\/p>\n Managing EAB requires specialized knowledge and equipment. Do not attempt to treat or remove infested trees on your own.<\/p>\n Resources like Boulder County\u2019s <\/em>decision guide<\/em><\/a> and <\/em>considerations for hiring a contractor<\/em><\/a> can help you make informed choices.<\/em><\/p>\n Tree health and safety: EAB disrupts water and nutrient flow, leading to tree death and potential hazards from falling limbs.<\/p>\n Environmental impact: Ash trees provide shade and habitat. Their loss affects local ecosystems and urban canopy cover.<\/p>\n Economic costs: Treating or removing infested trees can be expensive for homeowners and municipalities.<\/p>\n Preventing spread: Timely management helps protect neighboring trees and public green spaces from infestation.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Where to report findings” module_id=”report” _builder_version=”4.27.4″ _module_preset=”default” background_color=”#FFFFFF” custom_margin=”-75px||||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”-50px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text module_id=”homeowner-recommendations” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” header_3_line_height=”1.2em” global_colors_info=”{}”]<\/p>\n Contact your local Colorado State University extension office<\/strong><\/a>, your\u00a0city or county division of forestry<\/strong><\/a>, or the\u00a0Colorado State Forest Service<\/strong><\/a>.<\/p>\n Report the finding to the Invasive Species Hotline<\/a>.<\/p>\n If you suspect EAB on your property or have a suspected EAB insect sample, contact your local extension agent<\/a>, the\u00a0Schutter Diagnostic Lab<\/a>\u00a0at Montana State University, or the\u00a0Montana Department of Agriculture<\/a>.<\/p>\n If you suspect EAB in Utah, contact the https:\/\/extension.usu.edu\/pests\/uppdl\/index or the Insect and Pest Program at the Utah Department of Agriculture and Food<\/a>.<\/p>\n Submit detection information to USDA-APHIS<\/a>.<\/p>\n Access shared resources via the WIPM EAB Outreach Folder<\/a>.<\/p>\n EAB Information Network<\/a><\/p>\n Purdue University EAB website<\/a><\/p>\n Be a Smart Ash \u2013 Denver Parks & Rec<\/a><\/p>\n Colorado State Forest Service<\/a><\/p>\n 10 years of EAB in Boulder<\/a><\/p>\n Guidelines for hiring a contractor<\/a><\/p>\n Insecticide options for protecting ash trees from EAB<\/em><\/a><\/p>\n Urban ash management and EAB: facts, myths, and operational synthesis<\/em><\/a><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”-50px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text module_id=”WIPM-resources” _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n If you’re part of our EAB outreach and implementation grant team, you can access our shared folder with resources here<\/a>.<\/span><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”references” module_id=”references” _builder_version=”4.27.4″ _module_preset=”default” background_color=”#FFFFFF” custom_margin=”-75px||||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”-50px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”squiggle-left” _builder_version=”4.27.4″ _module_preset=”default” header_font=”||||||||” header_text_align=”left” header_font_size=”22px” width=”100%” module_alignment=”center” custom_margin=”3%||22px||false|false” custom_padding=”||||false|false” global_module=”23371″ saved_tabs=”all” locked=”off” global_colors_info=”{}”]<\/p>\n \t\t [\/et_pb_text][et_pb_text module_id=”homeowner-recommendations” _builder_version=”4.27.4″ _module_preset=”default” header_2_font_size=”30px” header_2_line_height=”1.3em” header_3_line_height=”1.2em” global_colors_info=”{}”]<\/p>\n EAB Information Network<\/a><\/p>\n Purdue University<\/a><\/p>\n Be a Smart Ash: Denver Parks and Rec<\/a><\/p>\n Colorado State Forest Service<\/a><\/p>\n 10 years with emerald ash borer in Boulder, Colorado<\/a><\/p>\n Guidelines for hiring a contractor<\/a><\/p>\n Insecticide options for protecting ash trees from emerald ash borer<\/a><\/p>\nImportant resources<\/h2>\n
General information on emerald ash borer (EAB)<\/h2>\n
Emerald ash borer in the west: what to know<\/h2>\n
Why it matters<\/h2>\n
\n
Current presence in the west<\/h2>\n
\n
Tracking and tools<\/h2>\n
Colorado<\/h3>\n
Oregon<\/h3>\n
National overview<\/h3>\n
How to identify emerald ash borer and symptoms of infestation<\/h2>\n
Identifying ash trees<\/h2>\n
\n
Identifying emerald ash borer<\/h2>\n
\n
Symptoms of infestation<\/h2>\n
\n
What to do if you suspect emerald ash borer<\/h2>\n
Step 1: Confirm identification<\/h3>\n
Step 2: Report the infestation<\/h3>\n
Colorado<\/h3>\n
Oregon<\/h3>\n
Montana<\/h3>\n
Utah<\/h3>\n
Wyoming<\/h3>\n
Step 3: Take action<\/h3>\n
Helpful Tools<\/h2>\n
Management and treatment options<\/h2>\n
Homeowner recommendations<\/h3>\n
Monitor trees<\/h3>\n
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Prevent spread<\/h3>\n
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Stay informed by following local updates and resources:<\/h3>\n
<\/h2>\n
Treatment strategies<\/h2>\n
Insecticide information<\/h3>\n
Work with professionals<\/h3>\n
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Why management matters<\/h3>\n
Resources and support<\/h2>\n
<\/h3>\n
Reporting EAB by state<\/h3>\n
<\/h3>\n
Colorado<\/h3>\n
Oregon<\/h3>\n
Montana<\/h3>\n
Utah<\/h3>\n
Wyoming and other states<\/h3>\n
Western IPM outreach and implementation grant collaborators<\/h3>\n
<\/h2>\n
Helpful websites<\/h2>\n
<\/h2>\n
Recommended publications<\/h2>\n
Resources for WIPM outreach and implementation grant collaborators<\/h2>\n
Helpful websites<\/h2>\n
Publications<\/h2>\n