Weeds:

• Refers to plant out of place or out of time.
• Are adapted to manmade habitats and interfere with human activities.
• Ruderals refers to plant occurring on earth heaps, dung hills, trash deposits and son on.
• Environmental weeds refer to introduced, aggressive species that colonize natural vegetation and suppresses the native species to a certain extent.
• Parasitic weeds refer to cuscuta and orobanche.

Types of weeds:

a) Agrestals:

• Weeds of crop land.
• Eg: Rice weed, Wheat weed, Pulse weed.

b) Ruderals:

• refers to plant occurring on earth heaps, dung hills, trash deposits and son on.

c) Grassland weed:

d) Parasitic weed:

• refer to cuscuta and orobanche.

1. e) Forestry weed:
2. f) Aquatic weed:

Economic importance of weeds

• As food.
• Fodder
• Medicines
• Botanicals
• Decorative ( Pistia, Eichornia, Lantana)

Medicinal weed of crop land

i) Marijuana

ii) Cannabis: Physical weakness

iii) Amaranthus: Paste in wounds or cuts.

iv) Cynodon dactylon (Dubo): Excess bleeding during mensuration.

v) Touch me not: Keep in mouth for toothache and dental problem.

vi) Solanum sps: Rheumatism.

Vii)Euphorbia: Wounds and cuts.

viii) Ocium bascilium: Cough.