roads, irrigation and drainage systems,
             Weed control has therefore become a necessity.
             A weed is defined as a plant growing where it is not desired - or a plant out of
             place (Khngrnan, 1961). Weeds incur losses in agriculture and in out-of-door indus-tries
             by lowering yields in terms of crops, pastures, meat, milk and wool, or by bring
             ing about the less efficient use of land. Weeds may harbor insect and disease organ-isms
             that attack crop plants and so added protection costs are needed. The presence of weeds result in poor quality products and problems in water management.
             They may give off undesirable flavors and odors in public water supplies.
             ...