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