Imprelis Could Harm Trees

The New York Times reported that Imprelis, a lawn care herbicide, might be the source of damage to new growth on certain trees and shrubs. Imprelis is a newly released herbicide used to control broadleaf weeds in lawns and other turf grass areas. An article by Jim Robbins in The New York Times on July 14 states that Imprelis was thought to be environmentally friendly when applied to turf grass. However, since its approval for sale and use by the EPA last fall, numerous complaints have arisen concerning damage to trees adjacent to the areas treated with the herbicide.

According to the article, some of the trees that have sustained damage are Norway maples, Norway spruce and white pines that are common in many residential, commercial and municipal landscapes.

The tree damage was initially thought to have been caused by chemical drifting during application, however, scientists now believe that Imprelis is being absorbed by the shallow root systems of the affected trees. They also believe the longer residual effect of Imprelis is exacerbating the problem of dieback in new branches on the trees.

SafeLawns.org warns gardeners and municipalities when composting grass clippings that due to the longer residual effect of Imprelis, it can be absorbed by lawn grasses and can remain active once the clippings are composted.
When this compost is applied to a garden, damage can occur to the plants as the roots absorb Imprelis from the compost in the soil.