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While off-target movement of pesticides is not a new problem, the growth regulator herbicides create a unique situation due to their ability to induce easily observed symptoms at very low doses. Large scale drift problems were experienced when the phenoxy herbicides were introduced in the 1950s.  Primitive application equipment and highly volatile ester formulations were largely responsible for these problems.  Advances in sprayers and formulations have greatly reduced, but not eliminated, off-target pesticide movement.