. It is a low-cost strategy, particularly suitable for the management of weeds that have spread into large areas with low profitability, such as pastures, natural environments, aquatic environments or forests, and of weeds that reproduce vegetatively, and are therefore relatively more genetically homogeneous. In these situations, the weeds represent ideal targets for control by agents with which they have co-evolved and have only been physically separated from for a relatively short period of time. If conditions are favourable, the agent multiplies and spreads into the habitat by limiting weed growth and reducing its spread. Thus, the population begins a slow decline. In this case, several months or even years are necessary to achieve the desired level of control.