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Treatment Options for Emerald Ash Borer Dr. Mark Shour

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PM 2084 Revised February 2015 Recommended insecticides work best as preventive treatments for healthy ash trees Healthy trees have full crowns, elongating branches, and bark tightly held to trunk/branches

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Preventive treatment Candidate ash trees are those planted along streets, in yard, or park settings Treatment is not practical or cost effective for woodlot trees where timber production is the primary goal

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Other control considerations 1.Identify the target tree as ash 2.Set sentiment aside, then: a.Judge health of tree b.Assess landscape value c.Determine cost/treatment X several years 3.Insecticide use for several years (yearly or every other year)

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National Tree Benefit Calculator Benefits include helping clean the air, slow stormwater runoff, raise property values, sequester carbon, and reduce energy costs A 25 white ash tree has an estimated annual economic benefit of $359 in Des Moines, Iowa www.treebenefits.com

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Purdue Cost Calculator To run the calculator you will need : an inventory of the number and size of ash trees an estimate of costs for removing and treating trees based on the size of each tree. an estimate of costs for replacing each ash tree that is removed. 3 options: treat, remove, replace http://extension.entm.purdue.edu/treecomputer/

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Other control considerations 4.Preventive treatments most effective curative application may work if less than 30% canopy dieback dead branches should be removed

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Other control considerations 5.Ash trees within 15 miles of a confirmed EAB site are at risk of attack; treatments are suggested Keep checking trees for symptoms outside of risk zone

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EAB chemical control Systemic insecticides require time and active tree growth prior to adult EAB activity: Soil treatments 4-8 weeks Trunk injections 2-4 weeks Some products penetrate faster

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Homeowner treatment options Type of application ActiveIngredient Tree Size Trunk circumference (diam. @ 4.5ft -dbh) Time of Application Soil drenchImidacloprid (1.47%) Up to 60 (20 dbh) Mid-April to mid-May or Early Aug to mid-Sept Soil drenchImidacloprid (21.4%) Up to 60 (20 dbh) Early Aug to mid-Sept Soil drenchImidacloprid, Clothianidin Up to 60 (20 dbh) Mid-April to mid-May or Early Aug to mid-Sept GranularDinotefuran (2%) Up to 36 (12 dbh) Mid-April to mid-May GranularImidacloprid, Clothianidin Up to 36 (12 dbh) Mid-April to mid-May GranularImidaclopridUp to 36 (12 dbh) Mid-April to mid-May

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Homeowner treatment notes Carefully read the product label before purchase & use Amount of insecticide depends on trees circumference If label lists spring & fall as possible treatment times, homeowners can only treat ONCE per year

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Homeowner EAB control Pull back mulch 12 from base of tree Soil drench treatment: trees up to 60 circumference/20 diameter. Apply spring every year. Granular treatment: trees up to 36 circumference/12 diameter. Apply spring every year.

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Homeowner treatment notes Apply soil drench product. Return mulch after product taken into soil. Dont apply to saturated or frozen soils

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Apply granular products evenly on soil around base of tree within 18 of trunk Irrigate after application to dissolve granules Reposition mulch at tree base

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For larger trees Treatment by commercial applicator Soil injection or drench Basal trunk spray Trunk injection

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Professional treatment options ProductActiveIngredient Application Method Application Time IMA-JetImidaclopridTrunk injectionSpring: Full canopy ImicideImidaclopridTrunk injectionSpring: Full canopy MeritImidaclopridSoil injection, drenchSpring, Fall MeritImidaclopridTrunk injectionSpring: Full canopy SafariDinotefuranSoil injection, drench; Basal bark spraySpring TranstectDinotefuranSoil injection, drench; Basal bark spraySpring Tree-AgeEmamectin benzoateTrunk injectionSpring Fall: Full canopy TreeAzinAzadirachtinTrunk injectionSpring XytectImidaclopridSoil injection, drenchSpring, Fall ZylamDinotefuranSoil injection, drench; Basal bark spraySpring

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Per Acre Use Limitations for Soil or Basal Trunk Treatments Professional product labels have specific per acre use limitations Homeowner products give once per year limitation; some give maximum product use per acre or 1000 sq. ft.

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Per Acre Use Limits Soil, Bark Trmts Residence (on acre lot) Residence (on acre lot) Driveway 6 ash trees

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Residence Driveway 20dbh 13 dbh 14dbh 8dbh 4dbh

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4 8 13 14 + 20 67 67 total treatable inches DBH

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Professional products Active IngredientFormulation Max/ Acre/ Year Annual/ Acre Use LimitTreatment Area Max Product/ Area/ Year Total Treatable DBH Minimum Rate Total Treatable DBH Maximum Rate >15 DBH Total Treatable Max Rate Imidacloprid2F1.6 pts0.4 lbs/a.i. 1/8 acre3.2 oz3216 EXCEEDS acre12.8 oz1286432 1 acre25.6 oz25612864 Imidacloprid75WSP/ 75WP 0.53 lbs 0.4 lbs/ a.i. 1/8 acre1.1 oz3216 EXCEEDS acre4.2 oz1286432 1 acre8.5 oz25612864 Dinotefuran20 SG2.7 lbs0.54 lbs/a.i. 1/8 acre5.4 oz5113 N/A acre21.6 oz20652 N/A 1 acre43.2 oz412104 N/A

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Residence Treat Must use another type of treatment Must use another type of treatment 64 total inches DBH to treat 20dbh 13 dbh 14dbh 8dbh 4dbh

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Canopy sprays not recommended Limited effectiveness Need special equipment Spray drift likely Possible adverse effects to nontargets

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Commercial application techniques Soil injection

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Commercial application techniques Mauget trunk injection Kioritz soil injection

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Commercial application techniques Arborjet systemWedgle method

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Commercial application techniques iQ Tree infuser Basal bark spray

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Reference PM 2084 is available as PDF at the ISU Extension Online Store mshour@iastate.edu 515-294-5963