ABSTRACT
Countries regulate the use of herbicides to ensure that they are applied properly and safely with minimal risk to the environment. These regulations include how the herbicides will be applied, where they will be applied, and at what rates they will be used. This chapter addresses the history of the regulation of herbicides in terms of resistance management and how newly proposed changes may affect resistance practices in Europe and the United States. An important aspect of the guideline is that it focuses exclusively on “practical resistance.” Resistance is defined as “the naturally occurring, inheritable adjustment in the ability of individuals in a population to survive a plant protection product treatment that would normally give effective control.” Resistance risk analysis is described as an “iterative two-stage process.” Resistance risk evaluation will become an integral part of the registration decision-making process. Management strategies reduce selection pressure of the specific crop protection product to an acceptable and sustainable level.
