Biological Control Biological control is the use of living agents as a method of control. Some of these agents are very successful, while others are not so good. Most of these agents are limited to certain site criteria before they are effective. Inspect your land or site to make sure that the criteria is met before using any of these agents. Of course, the grazing animals do not have the limitations as the insects or other agents.
Insects are expensive to purchase.
Do not be misled by some who say insects are the cure-all for weed control. This is not true. Even with the successful insect control, it still takes years to see the results. In the mean time, the weeds are still reproducing. There has to be another control in place to keep the infestation in check until the insects can become established.