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Departments » UW Extension » Urban Horticulture & Natural Resources
General Information

Welcome to Brown County UW-Extension's

Urban Horticulture
Natural Resources Pro


Article of the Week
(Originally published in the Green Bay Press-Gazette on April 24, 2017)

Treat Ash Trees
Emerald ash borer, the killer beetle of ash trees, has been slowly spreading in multiple areas of Brown County. So far, EAB has been confirmed in the City of Green Bay (2009), Town of Morrison, Town of Glenmore, and the City of De Pere. Emerald ash borer is an invasive wood boring beetle that attacks only true ash species (green ash, white ash, black ash, purple ash) and can kill the ash tree in 2-4 years. To prevent the emerald ash borer attack, homeowners can treat their ash trees with various insecticidal products available at garden centers or by hiring a professional to do the treatment service.

However, not all ash trees are worth treating. A healthy ash tree with a full canopy, good branching structures, intact bark on its branches and trunk, and a proper location in the landscape is worth treating for EAB. Treatment costs can also play as a critical decision making factor. Trees with more than 50% thin canopy should not be considered for treatment.

Mid spring (mid-April to mid-May) is the best time to treat small ash trees that are less than 47” trunk circumference using a systemic insecticide containing imidacloprid as the active ingredient. Following homeowner insecticide products are some examples for spring EAB treatment:

Bayer Advanced Tree and Shrub Insect Control II (imidacloprid)
Bayer Advanced Tree and Shrub Protect & Feed (imidacloprid)
Bayer Advanced Tree and Shrub Protect & Feed II (imidacloprid + clothianidin)
Bonide Annual Tree & Shrub Insect Control with SYSTEMAXX (imidacloprid)
Compare N Save Systemic Tree & Shrub Insect Drench (imidacloprid)
Ferti-lome Tree and Shrub Systemic Drench (imidacloprid)
Optrol (imidacloprid)
Ortho Bug-B-Gone Year Long Tree & Shrub Insect Control (imidacloprid)

Always read the product label to determine the proper rate and safe application. Before drenching the product around the base of the tree, rake up any mulch, landscape fabric, and leaf litter to about 18-24” around the tree to facilitate direct contact of the insecticide with the soil. The ground needs to be thawed and moist at the time of application. Measure the volume of application needed as directed on the product label and slowly pour the solution around the base of the tree. Put the mulch back after application. The systemic insecticide treatment for drenching should be applied every spring. For best results, use the insecticide before the tree becomes infected. Do not drench the insecticide in porous sandy soils that lack in organic matter, steep slopes, shallow water table, or when heavy rain is forecasted within the next 24 hours. To protect surface water, systemic insecticides should not be applied to soil near ponds, lakes, or stream.

Larger ash trees that have more than a 47” trunk circumference are best treated by landscape and tree professionals, as they have access to a higher concentrated versions of the products and specialized application tools. Professional treatment products containing emamectin benzoate like ArborMectin, Boxer Brandt enTREE EB, Tree-äge, Tree-äge G4 can provide more than three years of control with a single application.

To learn more EAB and its treatment options, please visit or

For a list of certified arborists, visit

For horticulture-related questions and advice, contact Brown County UW-Extension’s Horticulture Help Desk at 920-391-4615 or


2017 All-America Selection Vegetable Winners
After extensive plant field trials across the country, All-America Selections (AAS) announces the best performing vegetable winners for this year. These winners are selected based on their trial garden performance in North America for fruit quality, yield, pest and disease resistance, and overall growth. You can find the seed sources of these
award winning varieties at Click here to learn more about this topic.


Horticulture Help Desk Services
We offer free consultations on lawn care advice, insect and disease diagnosis, and plant and insect identification. We also address tree and shrub problems as well as help you select the plants that are best suited to your needs and site. Soil tests and advanced diagnosis services are available for a fee.

Bring your live or digital specimen to the Horticulture Help Desk:

1150 Bellevue Street, Green Bay, WI 54302
Hort Help Desk Phone: 920-391-4615

The UW-Extension Office is open Monday through Friday from 8 AM to 4:30 PM.
If a horticulture staff member is not available when you call or visit, messages and samples can be left with UW-Extension reception, and a staff member will contact you.

We are here to serve you by connecting the University system, Master Gardener volunteers, and you - Northeast Wisconsin residents - to help things grow.

Contact:  Vijai Pandian - Horticulture Educator
Phone: 920-391-4611
Fax: 920-391-4617
Click here to email
Mailing Address:  Agriculture & Extension Service Center
210 Museum Pl
Green Bay, WI 54303
Hours:  Monday - Friday, 8 AM - 4:30 PM
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