There are two general strategies used in formulating weed management plans that can be characterized by sports analogy as either a “zone” or “man-to-man” defenses. The zone defense is designed to handle many different types of offense and is robust to the hazard of getting tricked into a misallocation of resources. The primary factor responsible for the choice is not effectiveness of the strategy in general, for one cannot dispute the logic that if every “man” is covered, then scoring will be difficult or impossible. The primary impediments to tailoring solutions to particular problems are: (1) time and labor costs associated with determining appropriate solutions, i.e. the solutions are too complex, and (2) uncertainties about the current state or process, e.g. we may not know which weed species are present, whether we have resistant genotypes, or when a species is vulnerable to control tactics.