They are available from most distributors of agricultural supplies. You can use a variety of equipment to apply herbicides, from boom sprayers suitable for large areas of level land to backpack sprayers for smaller areas or on irregular terrain. Specific mixing and application instructions are given on the manufacturers' labels. Apply herbicides only when needed and handle them with extreme care. Follow label directions and heed all precautions.
Pesticides are especially dangerous when improperly handled, applied, or disposed.
Two general types of herbicides are effective in controlling grasses and broadleaf weeds. Pre-emergence herbicides are soil applied. They control weeds by inhibiting seed germination and development. Post-emergence herbicides are applied to green foliage where the herbicide is absorbed and translocated throughout the plant. Some herbicides exhibit both soil and foliage activity.