Replication

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Economic importance of bryophyte.

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Herbicides

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  Herbicides   Herbicide is a chemical substance used to control or manipulate undesirable vegetation, especially weeds. They are extensively used in gardening, farming, and landscape turf management.   Classification of herbicides Herbicides are classified according to their:- Selectivity Mode of action Timing of application Chemical group Mechanism of action   2.1 Selectivity:   A) Non-selective herbicide kills or damages all plant life in a treated area (e.g., Glyphosate).   B) Selective herbicide will kill weeds in a germinating or growing crop without   harming the crop beyond the point of recovery (e.g., 2, 4-D used to control broadleaved weeds in a grass pasture; Avadex to control wild oats in cereals)   2.2 Mode of action:   A) Contact herbicides – Kills plant parts covered by the herbicide and are directly toxic to living cells. There is little or no translocation or movement of the material through the plant. Contact herbicides are effective against annual weeds but they onl
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