In recent years, weed scientists and the general public have become increasingly interested in the environmental impact and safety of weed control practices. This is especially true in regard to the use of herbicides. This has led chemical companies to stress the development of new herbicides of low mammalian toxicity that can be used at very low rates. These minimize environmental impact and maximize safe use. There has also been an increase in studies on the biology and ecology of weeds directed toward more effective control methods.