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AG 503 PRINCIPLES AND PRACTICES OF WEED MANAGEMENT                                                                               (3L+1P) I

Objective
  To provide basic and applied knowledge of weed science to the students, and to make them acquainted with weeds, herbicides, and weed management and research methods

Theory

UNIT I
  Weeds and their importance - harmful and beneficial aspects, weed characteristics and classification.

UNIT II
  Weed multiplication/propagation – seed dormancy, viability, germination and dissemination of weeds; crop-weed competition/ interference, allelopathy.

UNIT III
  Weed management principles and methods/options – preventive, physical, cultural, biological, chemical and integrated weed management approaches.

UNIT IV
  History and properties of herbicides, differences with other pesticides, classification of herbicides based on miscellany, chemistry (organic and inorganic) and physiology, structure - activity and selectivity.

UNIT V
  Herbicide injury symptoms, physiology/biochemistry of mode/mechanisms of action, herbicide transformations in plants and soil, herbicide formulations and applications; herbicide mixtures; herbicide resistance and management, herbicide residues in environment.

UNIT V1
  Weed management in major crops and cropping systems, and non-cropped situations; perennial, aquatic, parasitic and invasive weeds management.

UNIT VII
  Biotechnological applications in weed management; herbicide tolerant crops - risks and opportunities.

Practicals
  Weeds and weed seeds identification. Determination of  IVI (impor tance value index). Methodologies in studying crop-weed interference. Calibration of a sprayer, and volume, rate and swath width calculations. Herbicide application equipment and accessories, and application techniques. Herbicide formulations demonstration. Bioassay technique for the analysis of herbicide residues in soil. Determination of LD value of herbicides. Calculations of herbicide requirements for different crops, and non-crop terrestrial and aquatic situations. Weed control experiments – types, planning, conduct and recording of data. Data transformation and calculations of weed indices. Weed herbarium preparation.

Suggested Readings