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Contents:1. Introduction. 2. Classification of Weeds. 3. Ecology of Weeds. 4. Characteristics of Weeds. 5. Beneficial Effects of Weeds. 6. Dispersal of Weeds. 7. Crop-Weed Association. 8. Harmful Effects of Weeds. 9. Crop Weeds Competition. 10. Methods of Weed Control. 11. Formulation of Herbicides. 12. Aquatic Weeds. 13. Management of Parasitic and Problematic Weeds. 14. Mode of Action of Herbicides. 15. Degradation of Herbicides. 16. Management of Herbicide Residues in Soil. 17. Herbicides Interaction.

Weeds pose a major threat to the productivity of agricultural and horticultural crops. Weeds are the menace in agriculture and horticulture and cause in the lowering of yield of crops they infested. Keeping these facts in mind, Weed science is published to provide basic information of the weeds along with their control measures to Students, Teachers and persons engaged in agricultural activities. I do not pretend to claim credit for any original contribution on the subject. Rather; it should be viewed as a concise collection of various topics from different, books, bulletins, scientific paper, wave sight etc, the names of which are mentioned in the text itself or in the selected references.