jan 1, 1969 - DDT use restricted in U.S.
Description:
After studying the persistence of DDT residues in the environment, the U.S. Department of Agriculture (USDA)cancels the registration of certain uses of DDT (on shade trees, on tobacco, in the home, and in aquatic environments).Added to timeline:
Date:
jan 1, 1969
Now
~ 56 years ago