Classification of weeds 4 Ecology of weeds 3 CLASSIFICATION OF WEEDS 2 Dispersal of weeds 2 WEED CONTROL 2 Adjuvants 1 Aquatic weeds 1 Beneficial effects of weeds 1 Crop weeds competition 1 Crop-weed association 1 Formulation of herbicides 1 HERBICIDES 1 Harmful effects of weeds 1 Herbicide interactions 1 Non selective control of vegetation 1 SPECIAL WEEDS 1 WEED BIOLOGY 1 WEED MANAGEMENT 1 Weed control 1