Prevention: Prevent the entry and establishment of weeds into any uninfected area.
Eradication : This is complete removal of weed species, its live plant parts and seeds from an area. It may be a field/farm/ village/ geographical region depending upon the need. After eradication, weed will not reappear unless reintroduced to the area.
Control: In weed control methods, growth and infestation of weeds are severely restricted but not necessarily eliminated. The crop makes a normal yield.