For severe infestation, grubbing with a bulldozer is the best option. Repeated defoliation will kill most plants by depleting the energy reserves in the roots. Regardless of whether you use mechanical or animal control, the highest plant mortality occurs with three to six mowings or leaf removals per season for two to three consecutive seasons. Frequent mowing generally is not practical on farms because of either the time required or the cost. If a single mowing is all that can be accomplished in a year, the best time to cut is July to early August.
Early spring is the second best time.
Cutting annually at both times is desirable, especially for severe infestations. If sprouting occurs, mowing followed by chemical treatment of the stump will give a more effective control. Biological Biological control is the use of animals to control brush. Goats and sheep are two examples of live-stock that will eat brush. In fact, goats often prefer brush.