Controlling herbicide resistance (HR) and its associated environmental risks
is impossible without integrating social and economic science with
biophysical and technology aspects. Herbicide resistance is a dynamically
complex and ill-structured problem involving coupled natural–human systems
that defy management approaches based on simple scientific and technology
applications. The existence of mobile herbicide resistance and/or herbicide
tolerance traits add complexity because susceptibility to the herbicide is a
resource open to all farmers, impacting the weed population. Weed scientists
have extensively researched the biophysical aspects and grower perceptions
of HR. They also recognize that the “tragedy of the commons” can appear when
herbicide resistance is mobile across farms. However, the human structures
and processes, especially private and public institutions that influence
individual and group decisions about HR, have received little analysis. To
start filling that gap, we discuss an integrative management approach to
sustainable weed control that addresses the social complexity of farm
heterogeneity. For example, the need for a private or public collective
mechanism becomes apparent to address common-pool resource (CPR) aspects
when one farmer's weed control actions influence their neighbors'
situations. In such conditions, sole reliance on education, technical
assistance, and other incentives aimed at changing individual grower
behavior likely will fail to stem the advance of HR. Social science theories
can be used to enrich the understanding of human interaction with the
biophysical environment and identify key actors and social change processes
influencing those interactions in the case of HR. The short-run economic
advantages of herbicides such as glyphosate work against social change to
address HR, including the development of collective actions when mobile HR
conditions exist. We discuss seven design principles that can improve the
efficacy and cost of such collective approaches and draw insights from CPR
approaches outside of HR.