EPA stops sale of Dupont herbicide


Photo by xnt14, Flickr

A month ago the Iowa Environmental Focus covered a story on the link between the herbicide Imprelis and damaged trees. Last week the Environmental Protection Agency officially ordered DuPont to halt sales of the product. Earlier in the month, Dupont independently ceased selling Imprelis indefinitely.

The EPA issued a press release on their decision:

 The U.S. Environmental Protection Agency (EPA) today issued an order to E.I. DuPont de Nemours (DuPont) directing the company to immediately halt the sale, use or distribution of Imprelis, an herbicide marketed to control weeds that has been reported to be harming a large number of trees, including Norway spruce and white pine. Continue reading

Herbicide linked to damaged trees


Photo by IRRI Images, Flickr

A new herbicide may cause coniferous trees to die. The Quad-City Times reports that a chemical called Imprelis, created by DuPont, appears to cause damage to a few types of trees including the white pine and the Norway and Colorado blue spruce. Among the cities reporting damage are Iowa City and Cedar rapids:

The first damage reports came in late May/early June from the East Coast. Damage has now been reported in Chicago, Iowa City and Cedar Rapids, Iowa, but there has been none in the Quad-Cities, Iowa State University/Scott County Extension horticulturist Duane Gissel said.

Symptoms include twisting and curling, followed by the browning of needles, shoots and branch tips.

Although university Extension horticulturists say it is too early to determine whether affected trees are dead or will die, several nurserymen quoted in a July 14 New York Times article said they know of trees that are dead. Continue reading