DESCRIPTION OF COURSES

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PP 607/AG 607 PHYSIOLOGY AND BIOCHEMISTRY OF HERBICIDE ACTION                     (3L + 1P) III

Objective
  To provide the studnets up-to-date knowledge on herbicide physiology and biochemistry and recent approaches in weed management including biotechnological methods.

Theory

UNIT I
  Weed biology and ecology; allelopathy and allelochemicals; management options; weed economic thresholds; use of models for improved competition studies.

UNIT II
  Recent concepts on entry, uptake, translocation and metabolism of soil and foliar applied herbicides, and impact of environmental and plant factors.

UNIT III
  Physiological, biochemical and molecular mechanism of action of different groups of herbicides. Metabolic pathway of herbicide degradation in plants and soil.

UNIT IV
  Selectivity of herbicides - physiological and molecular mechanism; herbicide non-target toxicity. Herbicide residue and its management in cropping systems.

UNIT V
  Herbicide resistance in weeds. Site-specific weed management. Advances in herbicide formulations; adjuvants and their classification. Herbicide mixtures and interactions. Remote sensing and GIS applications in weed science.

UNIT VI
  Herbicide resistant crops - prospects, molecular and tissue culture approaches for development of herbicide resistant crops.

List of Practicals
  Adjuvants and their effect on spray droplets, chemical entry and transport in the plants. Determination of  effect of  herbicides on physiological and biochemical processes like photosynthesis, respiration, membrane permeability. Quantification of pigment levels in leaves as affected by herbicides. Estimation of specific enzyme activities affected by herbicides. Demonstration of herbicides translocation by radio labeling techniques. Bioassey technique for analysis of herbicide residues. Allelopathic effects of plants. Evaluation of bio-efficacy and selectivity of herbicides.

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