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Treatment Options for Emerald Ash Borer. Dr. Mark Shour. New Publication: PM 2084. Recommended insecticides work best as preventive treatments for healthy ash trees planted along streets or in yard settings Treatment is not practical or cost effective for woodlot trees.

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Treatment options for emerald ash borer

Treatment Options for Emerald Ash Borer

Dr. Mark Shour


New publication pm 2084
New Publication: PM 2084

  • Recommended insecticides work best as preventive treatments for healthy ash trees planted along streets or in yard settings

  • Treatment is not practical or cost effective for woodlot trees


Other control considerations
Other control considerations…

  • Identify the target tree as ash

  • Set sentiment aside, then:

    • Judge health of tree

    • Assess landscape value

    • Determine cost/treatment X several years

  • Insecticide use every year for life of tree


Other control considerations1
Other control considerations…

  • Preventive treatments most effective

  • curative application may work if less than 40% canopy dieback


Other control considerations2
Other control considerations…

  • Preventive treatments are suggested when confirmed EAB is 15 miles away; treatments outside this risk zone are not recommended

  • Ash trees in an eradication area are subject to removal by regulators even if preventive treatments were made


Eab chemical control
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


Homeowner eab control
Homeowner EAB control

  • Imidacloprid 1.47%

  • Up to 25” circumference/8” diameter tree

  • Pull back mulch 12” from base of tree

  • Soil drench / ‘bucket method’ on tree’s root flare

  • Early to mid-April every year


For trees larger than 8 diameter
For trees larger than 8” diameter

  • Treatment by commercial applicator

  • Soil injection w/ imidacloprid

  • Trunk spray w/ dinotefuran

  • Trunk injection w/ imidacloprid, bidrin, or emamectin benzoate


What is tree age
What is Tree-age?

  • Active ingredient emamectin benzoate

  • Special local needs labels initially in EAB infested areas; new national label expected

  • Only EAB treatment effective for more than one year (up to 3 years?)

  • Must be injected into tree via ¼ inch drilled holes; potential for injury to the tree


Canopy sprays not recommended
Canopy sprays not recommended

  • Limited effectiveness

  • Need for special equipment

  • Spray drift likely

  • Possible adverse effects to nontargets


Commercial application techniques
Commercial application techniques

Soil injection

from larger tank


Commercial application techniques1
Commercial applicationtechniques

Mauget trunk injection

Kioritz soil injection


Commercial application techniques2
Commercial application techniques

Arborjet system

Wedgle method


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