United to advocate professionalism, integrity and growth for Michigan's green industry

MNLA E-Training, Project Plant

Michigan’s Green Industry – Continuing to GROW!

About the Industry
With a combined economic impact of $5.715 billion, Michigan’s nursery, perennial plant production, Christmas tree, sod producers, landscaping and lawn care industries continue to grow!

* We are the 4th largest Nursery State in the Nation!

*#1 specialty crop in Michigan
*Landscape services and Retail Sectors = $4.5 billion economic impact
*Together, all segments of the Green Industry account for a total of 36,162 individuals employed (Knudson & Peterson, 2012). According to US Census Data, this equates to 1 out of every 170 Michigan citizens between the ages of 18-65.

About Us

What is Imprelis?
Imprelis is a relatively new selective herbicide labeled for use to control broadleaved weeds in turf and lawns.  It is intended for use by professional applicators.  The active ingredient in Imprelis is aminocylopyrachlor, which is a synthetic auxin.

What kind of injury to landscape trees has been observed following Imprelis application?
Homeowners, lawn service operators, and others have observed browning of shoots and needles and twisting and stunting of new shoots especially near tops of trees following application of Imprelis in Spring 2011. Symptoms are usually most severe on current year (outermost or topmost) growth. 

What trees are affected by Imprelis?

Conifers, particularly Norway spruce and Eastern white pine are most commonly affected and show the most characteristic symptoms. Based on site visits and reports from the Purdue University Plant and Pest Diagnostic lab, other conifers that may be affected include Colorado blue spruce, Black hills spruce, firs, Douglas-fir, yews, arborvitae, Dawn redwood and Baldcypress.  Hardwood species may also be affected.  Honeylocust seems to be the most commonly listed hardwood for Imprelis-related injury.  In addition, damage has been reported on Cottonwood, Maple, Lilacs, Boxwood, Redbud, Ginkgo, Willow, Euonymus, Tulip poplar, Viburnum, Mulberry, Rose of Sharon, Paw paw, and River birch.

How widespread is the problem?

University Extension websites from Kansas to Pennsylvania have reported injury to trees associated with Imprelis application to turf and lawns.

What should I do if I suspect injury to trees after applying Imprelis?

We’re receiving reports of damage with the broadleaf herbicide Imprelis (a.i. aminocyclopyrachlor) to Norway Spruce and White Pine in Michigan and have this important information to pass on to you.

If you are a commercial applicator that has applied this product and are receiving complaints from customers that have trees showing adverse effects, we are recommending the following actions:


Subscribe to Michigan Nursery and Landscape Association RSS