Integrated Pest Management programs are effective in optimizing inputs in the most efficient way to achieve weed control. IPM involves a combination of herbicides to achieve most beneficial results. Some herbicides, for example, inhibit photosynthesis or disrupt cell membranes. A species affected by a pesticide application but not intentionally targeted. Noxious weeds are those regulated by law or those that are so difficult to control that early detection is important.
Noxious weeds targeted include witchweed, hydrilla, salsola, hemp, broomrape, and common crupina.
Authority to exclude foreign weeds from the U.S. is provided in the Federal Seed Act of 1939, Federal Pest Act of 1957, and the Noxious Weed Act of 1974. Any treatment of a site made after it emerges from the soil. May be a contact herbicide by burning off aboveground stems and leaves, or a systemic herbicide which is translocated throughout the weed plant. May be soil applied or directed to the weeds. Any treatment made before the weeds emerge.