Trees damaged by herbicide in Lancaster, Pa. Photo by John E. Kaminski
A recently approved herbicide called Imprelis, widely used by landscapers because it was thought to be environmentally friendly, has emerged as the leading suspect in the deaths of thousands of Norway spruces, eastern white pines and other trees on lawns and golf courses across the country.
Follow the link:
http://www.nytimes.com/2011/07/15/science/earth/15herbicide.html?_r=1&hp#