Gaurav Arora provided information on weeds in 3 sections. Section 1 defined characteristics of weeds such as undesirable growth and tolerance of adverse conditions. Section 2 described aspects of weed propagation including high reproductive rates and persistence through seeding and vegetative means. Section 3 listed common weed species, their propagation methods (e.g. seeds, stolons), and natural/artificial dissemination agencies (e.g. wind, animals, machinery). The document emphasized weeds' competitive abilities due to rapid reproduction and dispersal.

1. GAURAV ARORA
Baba Farid
College
95011-15309

2. • Undesirable and unwanted plants
• Grow voluntarily at places where it is not
wanted
• Plant growing where it is not desired
• Plants whose virtues are not known yet
• Grow at places where other useful plants
grow

3. • Competitive and aggressive in nature
• Can tolerate adverse climatic
conditions
• Resist control
• Morphological similarities
• High reproductive capacity

4. • Persistent in nature
• Early seed setting
• Repeated germination in different
phases
• Deep root system
• Similarity of seeds

6. • PROPAGATION
• DISPERSAL
• PERSISTENCE

7. Reproduce by seeds
• Seeds
• Time of flowering
• Seed setting,
development and
maturation
• Weed seeds in soil
Vegetative reproduction
• Stolons & runners
• Rhizomes
• Tubers
• Bulbs
• Corms
• Roots
• Stems
• fragmentation

8. Sr
.
n
o.
Weed Species Common name Average
no. of
seeds per
plant
1 Ageratum spp. Billgoat weed 1,00,000
2 Argemone mexicana Mexicana poppy 4,000
3 Amaranthus spp. chlai 1,96,000
4 Cyperus rotundus Motha, purple
nutsedge
40
5 Chenopodium album bathu 72,000

9. Sr
.
no
.
Weed Species Common name Form of
propagation
1 Alium vineale Wild garlic Bulbs
2 Agropyron repens
Sorghum halepense
Quakgrass
Johnnsongrass
Rhizomes
3 Ranunculus bulbosus Bulbous buttercup Corms
4 Cyperus rotundus Motha, purple
nutsedge
Tubers and
stolons
5 Portulaca oleracea Nunka, perlane Fragmentatio
n
6 Cynodon dactylon Bermuda grass Stolons and
Runners

10. Natural agencies
• Wind
• Water
• Animals
• Forceful opening
Artificial dissemination
• Machinery

11. Sr
.
n
o.
Weed Species Common name Natural
agencies
1 Striga spp
Cirsium arvense
Witch weed
Canada thistle
Wind
2 Chenopodium album
Amranthus viridis
Echinochloa crusgalli
Bathu
Pig weed
Barnyard grass
Water
3 Phalaris minor
Chenopodium album
Lantana camara
Canary grass
Bathu
Lantana
animals
4 Oxalis spp Khat-mithi Forecful
opening
5 Portulaca oleracea Nunka, purslane Fragmentati
on

12. • Higher seed production rate
• Asexual propagation
• Rapid dispersal
• Crop-weed association
• Continuous practices

14. “ONE YEAR SEEDING,
SEVEN YEARS WEEDS”