AGRO-359

AGRO-359: WEED MANAGEMENT

Credits: 2(1+1)

THEORY:
Weeds: Introduction, harmful and beneficial effects, classification, propagation and dissemination, Weed biology and ecology, crop weed association, crop weed competition and allelopathy. Concept of weed prevention, control and eradication, Methods of Weed control: Physical, cultural, chemical and biological methods. Integrated weed management.

Mechanical control: Use of brush cutters and ploughing.

Cultural control: Use of plastic and organic mulch.

Herbicides: Definition, advantages and limitation of herbicide usage in India Herbicide: classification, formulations, methods of application.

Introduction to Adjuvants: their use in herbicides.

Mode of action of herbicide: Translocation and absorption, persistence and fate of herbicides. Introduction to selectivity of herbicides, Compatibility of herbicides with other agro chemicals.

Weed management in major field and horticultural crops. Shift of weed flora in cropping systems, Aquatic, parasitic and problematic weeds and their control.

PRACTICALS:
Study of weeds; Survey of weeds in crop fields and other habitats; Preparation of herbarium of weeds; Calculations on weed control efficiency and weed index; Herbicide label information; Computation of herbicide doses; Study of herbicide application equipments and calibration; Demonstration of methods of herbicide application; Preparation of list of commonly available herbicides; Study of phytotoxicity symptoms of herbicides in different crops; Biology of nut sedge, bermuda grass, Eupatorium, Parthenium; Economics of weed control practices; Visits to problematic weed areas.

Practical (Experiments):
1- 2) Identification of weeds.
3- 4) Survey of weeds in crop fields and other habitats.
5- 6) Collection of weeds and preparation of weed herbarium.
7- 8) Biology of Nut grass (Cynadon), Bermuda grass, Lantana and Eupatorium.
9) Calculations of weed control efficiency and weed index.
10) Preparation of list of commonly available herbicides, label information and computation of herbicide doses.
11) Study of herbicide application equipments, calibration and demonstration on methods of herbicide application.
12) Study of phytotoxicity symptoms of herbicides in different crops.
13) Demonstration of mechanical brush cutting.
14) Demonstration of plastic mulching.
15) Demonstration of organic mulching.
16) Economics of weed control practices.
17) Visits to problematic weed areas.