Chris Boerboom, UW Extension Weed Specialist , offers these woolly cupgrass management strategies. Because woolly cupgrass is probably spread by contaminated field equipment, till and harvest infested fields last to prevent moving seed to noninfested fields. After tilling, chopping silage, or combining in infested fields, thoroughly clean the equipment. If small new patches are found in a previously clean field, use aggressive control measure to try to prevent its establishment and spread. A delay in planting give the advantage to this vigorous weed.
Crop rotation is also an important tool.
Alfalfa is competitive against woolly cupgrass and its frequent harvest prevents cupgrass seed production. After a few years of alfalfa, the seed bank of woolly cupgrass should be significantly reduced, but not eliminated. Winter wheat also is a very competitive rotational crop against cupgrass. Rotary hoe about seven to ten days after the last tillage for seedbed preparation when cupgrass seedling have sprouted, but before they emerge. If a postemergence herbicide program is planned for cupgrass control, rotary hoeing gives greater flexibility for the timing of postemergence herbicide application.