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HomeMy WebLinkAboutEmerald Ash Borer PresentationEmerald Ash Borer Iowa City Response Update CITY of IOWA CITY City Council Work Session - September 4, 2018 • Juli Seydell Johnson, Parks & Recreation Director • Zachary Hall, Parks Superintendent • Mike Kintner, IDALS Entomologist • Mark Vitosh, Iowa DNR District Forester. 'icy, 64. ` * +t� 4 4 At qp V ^ �> JL ! , i IIIA ry� a.,. 1324 Davenport St :�:. , �,�,�, -,,��: _ , ,-1'.i . a � �� `� � ��'r �£� �. � '�+k e . �: r . r '� 4 'T y'.r� �. x ti`s �`� ,,. r _ ,�' � �`- p ' '�, r (� 4 .. — �'#� $ � Y 4 � � � � C'S �J, �. T. � ' �� yj T 1y�y �. ... 'r .. r �' . ., .: _ u— _ i �� a.:;� �. ,. �, •, �. n l ,,. _ I r __ .. rv� N S ` r a- ,�,. �. v erwe�x+ a`�''^tiw�P+�i KT FwM u: 1. ... ... ,... d Imp .x\ N*' � � � t a,: � r•: :.:A, wFS. . a � 8` e r• rs � r� w • .SSA '� �rt �� h � f yyLL A�yy d Imp .x\ N*' � � � t a,: � r•: :.:A, wFS. . a � 8` e r• rs � r� w y�14 til `�;':#, �4 P'y''. ,.� � � �•• Y QV '12A Brief History - Lesson Not Learned • Prior to 1950 - American Elm trees was "America's Favorite Street Tree" • 1950-1970, Dutch Elm Disease (DED) destroys millions of urban Elm trees. • Ash trees became new favored replacement • 1930s -early 2000s, Ash trees planted • Using one species of tree provided symmetrical, shade tree canopy over urban streets. j0 Significant Ash Tree ;r �� • CITY OF IOWA CITY Distribution In I©Wa City UN15COCITY UF LITER AT UR[. O I ONq - �� �'� �n aL 'L a IGN'A GIIY - � _ 1' � � pal, Iron c• CORA-Vlbl, , r ,d .' LVILLE� k• r NAS«, Ir`} �L.%' 17, 7 fl L f cora" ,Iw* 10 AI IT. WA r n IMS 19.9% Maple 3492tmes a Ash trees 7,6% Oak 3,280 trees 7.3% Elm trees 6.5% Hackberry 2804 trees 6.2%Mulberry o rY _2,660trees5.9 o o Crabapple PP 6 2073 tmes o --- --- 4.6 / Cherry 1.688 trees 3.8% Honeylocust -_ 13,609_t�ees 30.4% Other 45,000 total trees . inventoried 2002 EAB discovered in Michigan Begins sPn,wmg West 2010 FAB first seen in Iowa Iowa CRY begins Remove] of unheaRhy Ash trees. New trees Planted in place. 2004 Iowa City stops planting Ash trees 384 355 223 177 34 41 Ash Ash ■ Total bees Rmmved ■ Total Trees Replanted October 2014 IC City Council holds work session on EAB 2014 First FAB Beetle identified in Iowa City Johnson County not cansPdered mfas.d 578 2015 2016 2017 FAB confirmed in Iowa City Power point slides 14 through 24 presented by Mike Kinter. Agrilus planipennis Mike Kintner Iowa Department of Agriculture & Land Stewardship (IDALS) Emerald Ash Borer (EAB) Background • Native to Asia • Attacks & kills true ash in North America • Ash trees of all sizes at risk: %" saplings to largest mature trees • Kills 99% + of ash in infested areas • Adult beetle fly short distances (generally 1 mile or less) • Humans contribute to spreading EAB much further Emerald Ash Borer Adult • Adult flight season is May — August • Female lays eggs in crevices of the bark or under bark flakes • Usually 40 — 70 eggs per female E r 1 „Y #IJ lip. w Photo credit: David Cappaert„ www.forestryi mages. org f Lag Photo credit: Debbie Miller, USDA Forest Service, Bugwood.org Emerald Ash Borer • Chew through outer bark and feed in phloem • Larval tunneling under bark disrupts movement of water and nutrients • Feeding girdles the tree Photo credit: David Cappaert, Michigan State Larva University/Bugwood.arg Emerald Ash Borer • Chew through outer bark and feed in phloem • Larval tunneling under bark disrupts movement of water and nutrients • Feeding girdles the tree I Credit: ➢an Herms, OWo State University 2006 (Before EAB) 2009 (After EAB) Ash mortality from EAB 100 90 80 70 t+ 60 O s0 a+ C U 40 L d 30 20 10 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Years After First EAB Infestation Dr. Dan Herms, The Ohio State University Davey Tree Experts Emerald Ash Borer History of the spread - A national perspective Cooperative Emerald Asn Borer Project Cooperative Emerald Ash Borer Project N MFmerlra FAB mtlons F UWnlo nn L.! elan,U xy, H rylane, V y Nrylnla WI I W VI�I1,1-1 f tln . I(l/{ /// -, ]anwrv2405�•..— =5*T 1—M mne t E N � i)\ .. c 4 AM a O 2005 2009 Emerald Ash Borer History of the spread cont. - A national perspective -1. 2014 2018 (as of Aug 1) Emerald Ash Borer History of the spread - Iowa 2010-2012 2013 2014 Counties with one or more confirmed infestations Emerald Ash Borer History of the spread cont. - Iowa 2015 2016 2017 Counties with one or more confirmed infestations Power point presentation by Mike Kinter ended. (Slide 24) Iowa Oepadment of Agriculture & Land Stewardship, Entomology 8 Plant Science Bureau, Entomolcay(a),IowaAariculture aov, 515-725-1470 Gibson Square — U of Iowa February 2016 4 Final thoughts... r j• Distribution of EAB is always further along tha can be documented visually Areas within 15 miles of a known EAB find are at high risk for EAB infestation • Be proactive, not reactive -especially when it comes to safety • Dying or dead trees pose a hazard ., Iowa City Criteria for Removing Trees Public safety hazard Decline condition with disease or infestation Storm damage (100+ calls for service last week) Public improvement project Dying ash in a f-�Chicago r park s �j'Sr s iiweC-.. new i5 '% P�.,� k' , � .i" t �� R � } ��. i �. / ` 7" �'l l� 2 '� _ T` �� v! R'1 fi y � � -'�A .. '.. • en. a �� . _ __ -.. �.. 1� _ _���—� . �..� _._....__: �w ...�.._, �.; k .... ��:� -- -- s.F!P".. � - �.. '\ �/ t _ ��.\ 4 tir .. � � � �11.'ki 729 Market St y�14 til `�;':#, �4 P'y''. ,.� � � �•• Y Focus on Planting & Diversifying All Tree Removals vs Replanting 700 _.............. 600 500 400 300 200 100 -- 1 0 2015 2016 2017 2018 ■ Total Removals ■ Total Plantings All Tree Removals vs Total Replantings • Total Removals • Total Plantings 1.9: 1 Replant:Removal � 2 N /����� < .Alw. a -- Management Options Remove All...................Remove as Deteriorate ............ Chemically Treat • Disruptive to • Minimizes visual • Emerging Option Neighborhood impact. • -$50,000/year for • Efficient • Allows for varied Iowa City • Most common replacement • Needs repeating 10-15 years ago. • Improves tree to remain effective diversity IJ ({f, j,.1� 1 4 1IIS4' Iicid Ortiolis tcti Trees 4 from F0'ra ld Ash Bard Concerns with Chemical Treatment of Trees • Use of City resources • Environmental impact on pollinators and other species. • Commitment to long-term treatment plan • Current "Limited Chemical Use in Parks" policy EAB PROTECTION AND POLLINATORS • A//active ingredients used are toxic to bees • Ash are wind pollinated; flowers open March/April • Cool, early spring temperatures reduce bee activity • Some ash pollen is collected by bees when other pollen/nectar sources are limited • Extra precaution with flowering plants w/in 25' of ash tree — avoid soil treatments and trunk sprays Iowa City Notification & Replacement • Each property owner* is contacted prior to removal unless it is a safety hazard that cannot wait. o In Person o Phone Call o Letter • Staff discusses need for tree removal with property owner. • Owner is given a timeline for removal and options for species of tree to be replanted. • It may take several months for both the stump to be removed and new tree to be planted. * It is the property owner, not rental occupant, who is contacted. Other Cities CITY # of ash TREATMENT REMOVAL street trees Minneapolis 40,000 None All 40,000 — remove (will treat onlyas a strategy to prolong removal) Davenport 3,000 200 for unspecified length of 2800 time Kansas City 20,000 14,000 every 3 years for 9 years Remove/replace then re -assess 6000 21,000 Madison 151000 61000 Chicago 85,000 Treat 35,000/yr for 2 years to 15,000 slow spread. Reassess every 3 years Milwaukee 31,000 Treat 28,000 indefinitely 51000 Grand Rapids, MI's (86,000 Trees) Treat and Remove Strategy 2007: EAB detected 2008: • -8,000 Ash trees • ash started trunk injections of Ash trees -1,500 per year (3,000 total treated) 2016: • -6,000 Ash trees removed due to EAB • -2,000 Ash trees left in inventory, treating -700 per year Staff Comparison: Grand Rapids: • Forestry Budget - $2M • Staff -12 FTE, 6 PTE Iowa City: Forestry Budget - $646,000 Staff - 5 FTE, 1 PTE Grand Rapid's Experience: •Left untreated, Complete ash tree mortality takes about 16 years post identification of EAB •Year 9 is a marker for beginning of exponential tree dying •Systemic trunk injection of Tre-Age is the most effective treatment approach •Any tree gin dbh or less is not worth treating •Any tree 35in dbh or greater will slow down treatment production due to slower uptake. Trees of this size are usually specimen trees with higher demand and desire to save. •Treatment is for the life of the tree. Once treatment stops, protection from infestation stops. *Case Study to be released in the next year. a 2017-18 Iowa City Tree Inventory • Physical inventory taken between November 2016 - July 2018 • 45,000 GPS Data points recorded • 40,000 Existing Trees • 5,000 Priority Planting Locations • Tree Inventory is basis for Urban Tree Management Plan • Both Inventory and Management Plan to be available on-line to public later this fall. • Tree Inventory Data includes: • Location • Size • Type of Tree • Environmental Impact • Classification of Condition - Based upon day of survey 4L�l OL omamly� AF . v '14V tr Z�M P6 _ I7.'' e- tzxuMOM aal�m ' I T147 f NL" $n .Il"-'2a0*JI ,- 'FSJ3 a1 ...L�` .r. �r�ky Cll �,.,.,T nKcwV rLClr 74 n ,' � air' "s. s �' � AN9t � ' r r ' ,tiy xw.�•. ? .vz F 2 A a �+ -'i' F _ i e 3 3'T ryl�7 :r•rr xsa '��s' '� (NMKr:3 _ gg VIT or wF rl R . ncaaa.y�:e S9 .'. f A ~,'.'vim.`,, h 'Ind 9 CdQ3i-'9�F1)F13 _ . 9