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CLASSIFICATION OF WEEDS
Registration number:-
V. Meghana – 210804130055
S. Deepika – 210804130057
J. V. Roopesh – 210804130058
G. V. V. Ram Krishna - 210804130061
BASED ON LIFE SPAN
( ONTOGENY )
Weeds are of 3 types :-
• Annual weeds
• Biennials
• Perinnials
ANNUAL WEEDS
• PLANTS THAT GERMINATE FROM SEED, GROW, FLOWER AND SET SEED,
SO COMPLETING THEIR LIFECYCLE, WITHIN ONE YEAR. EX:-C ALBUM
•BIENNIAL WEEDS
• BIENNIAL WEEDS COMPLETE THEIR LIFE CYCLE IN TWO YEARS IN THE
FIRST YEAR THEY REMAIN VEGETATIVE, AND IN THE SECOND YEAR THEY
PRODUCE FLOWERS AND SET SEEDS.EG. ALTERNANTHERA ECHINATA,
DAUCUS CAROTA.
•PERENNIAL WEEDS
• PERENNIALS LIVE FOR MORE THAN TWO YEARS AND MAY LIVE ALMOST
INDEFINITELY. THEY ADAPTED TO WITHSTAND ADVERSE
Based on Ecological Affinity
• Wet Land Weeds
• The weeds that are common in a rice eco-system are normally
considered as wetland weed. Ex:- Azolla filiculoides
• Garden Land Weeds (Irrigated
Lands)
• Ex:- Ground Ivy.
• Dry Land Weeds
These are usually hardy plants with deep root system Eg.
Tribulus terrestris, w Argemone mexicana.
• ANNU
BASED ON SOIL TYPE
Weeds of Light sandy or loamy soils
Weeds that occur in having good drainage. Eg. Leucas aspera
Weeds of laterite soils:
Eg. Lantana camara, Spergula arvensis.
Weeds of red soil
They are like the weeds of garden lands consisting of various
classes of plants. Eg. Commelina benghalensis
BASED ON PLACE OF
OCCURENCE
Weeds of crop lands :-Amaranthus (chaulai) and
Chenopodium (bathua).
Weeds of pasture lands :-Weeds found in pasture /
grazing grounds. Eg. Indigofera enneaphylla
Weeds of waste places: Eg. Gynandropsis pentaphylla,
Calotropis gigantean.
BASED ON ORIGIN
Indigenous weeds: All the native weeds of the country are
coming under this group and most of the weeds are
indigenous. Eg. Acalypha indica, Abutilon indicum
Introduced Or Exotic weeds: These are the weeds introduced
from other countries. These weeds are normally troublesome
and control becomes difficult. Eg. Parthenium hysterophorus,
Phalaris minor, Acanthospermum hispidum
BASED ON COTYLEDON
NUMBER
Based on number of cotyledons it possess it can be classified as
dicots and monocots.
Monocots Eg. Panicum flavidum, Echinochloa colona
Dicots Eg. Crotalaria verucosa, Indigofera viscose
BASED ON SOIL PH
Based on pH of the soil the weeds can be classified into
three categories.
Acidophile – Acid soil weeds eg. Rumex acetosella
Basophile – Saline & alkaline soil weeds
eg. Taraxacum sp.
Neutrophile – Weeds of neutral soils eg:-Acalypha indica
BASED ON MORPHOLOGY
This is the most widely used classification by the weed
scientists.
• Grasses: All the weeds come under the family Poaceae
are called as we grasses Eg.Echinocloa colonum,
Cynodon dactylon.
• Sedges: The weeds belonging to the family Cyperaceae
come under this group. Eg.Cyperus rotundus,
Fimbrystylis miliaceae.
• Broad leaved weeds: This is the major group of weeds.
All eeeeeeedicotyledon weeds are broad leaved weeds.
BASED ON NATURE OF STEM
• Woody weeds: Weeds include shrubs and undershrubs and
are collectively A called brush weeds. Eg. Lantana
camera, Prosopis juliflora
• Semi-woody weeds: eg.Croton sparsiflorus
• Herbaceous weeds: Weeds have green, succulent stems are
of most Q QQ common occurrence around us. Eg.
Amaranthus viridi
BASED ON SPECIFICITY
• Poisonous weeds:- Eg. Datura fastuosa, D. Stramonium
• Parasitic weeds:- It is further divided into 4 types:-
1. Total root parasite – Orabanche cernua on Tobacco
2. Partial root parasite – Striga lutea on sugarcane and
sorghum
3. Total stem parasite – Cuscuta chinensis on leucerne and
onion
4. Partial stem parasite – Loranthus longiflorus on mango and
other trees
• Aquatic Weeds :- These are divided into 4 types :-
1. Submersed weeds :- Eg:- Utricularia stellaris,
Ceratophyllum demersum.
2. Emersed weeds :- Eg. Nelumbium speciosum, Jussieua
repens.
3. Marginal weeds :- Typha, Polygonum, Cephalanthus,
Scirpus, etc.
4. Floating weeds :- Eichhornia crassipes, Pistia stratiotes,
Salvinia, e ee Nymphaea pubescens.
THANK YOU
SUBMITTED TO:- DR. RAJESH KALASARE

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weed management ppt.pptx

  • 1. CLASSIFICATION OF WEEDS Registration number:- V. Meghana – 210804130055 S. Deepika – 210804130057 J. V. Roopesh – 210804130058 G. V. V. Ram Krishna - 210804130061
  • 2. BASED ON LIFE SPAN ( ONTOGENY ) Weeds are of 3 types :- • Annual weeds • Biennials • Perinnials
  • 3. ANNUAL WEEDS • PLANTS THAT GERMINATE FROM SEED, GROW, FLOWER AND SET SEED, SO COMPLETING THEIR LIFECYCLE, WITHIN ONE YEAR. EX:-C ALBUM •BIENNIAL WEEDS • BIENNIAL WEEDS COMPLETE THEIR LIFE CYCLE IN TWO YEARS IN THE FIRST YEAR THEY REMAIN VEGETATIVE, AND IN THE SECOND YEAR THEY PRODUCE FLOWERS AND SET SEEDS.EG. ALTERNANTHERA ECHINATA, DAUCUS CAROTA. •PERENNIAL WEEDS • PERENNIALS LIVE FOR MORE THAN TWO YEARS AND MAY LIVE ALMOST INDEFINITELY. THEY ADAPTED TO WITHSTAND ADVERSE
  • 4. Based on Ecological Affinity • Wet Land Weeds • The weeds that are common in a rice eco-system are normally considered as wetland weed. Ex:- Azolla filiculoides • Garden Land Weeds (Irrigated Lands) • Ex:- Ground Ivy. • Dry Land Weeds These are usually hardy plants with deep root system Eg. Tribulus terrestris, w Argemone mexicana. • ANNU
  • 5. BASED ON SOIL TYPE Weeds of Light sandy or loamy soils Weeds that occur in having good drainage. Eg. Leucas aspera Weeds of laterite soils: Eg. Lantana camara, Spergula arvensis. Weeds of red soil They are like the weeds of garden lands consisting of various classes of plants. Eg. Commelina benghalensis
  • 6. BASED ON PLACE OF OCCURENCE Weeds of crop lands :-Amaranthus (chaulai) and Chenopodium (bathua). Weeds of pasture lands :-Weeds found in pasture / grazing grounds. Eg. Indigofera enneaphylla Weeds of waste places: Eg. Gynandropsis pentaphylla, Calotropis gigantean.
  • 7. BASED ON ORIGIN Indigenous weeds: All the native weeds of the country are coming under this group and most of the weeds are indigenous. Eg. Acalypha indica, Abutilon indicum Introduced Or Exotic weeds: These are the weeds introduced from other countries. These weeds are normally troublesome and control becomes difficult. Eg. Parthenium hysterophorus, Phalaris minor, Acanthospermum hispidum
  • 8. BASED ON COTYLEDON NUMBER Based on number of cotyledons it possess it can be classified as dicots and monocots. Monocots Eg. Panicum flavidum, Echinochloa colona Dicots Eg. Crotalaria verucosa, Indigofera viscose
  • 9. BASED ON SOIL PH Based on pH of the soil the weeds can be classified into three categories. Acidophile – Acid soil weeds eg. Rumex acetosella Basophile – Saline & alkaline soil weeds eg. Taraxacum sp. Neutrophile – Weeds of neutral soils eg:-Acalypha indica
  • 10. BASED ON MORPHOLOGY This is the most widely used classification by the weed scientists. • Grasses: All the weeds come under the family Poaceae are called as we grasses Eg.Echinocloa colonum, Cynodon dactylon. • Sedges: The weeds belonging to the family Cyperaceae come under this group. Eg.Cyperus rotundus, Fimbrystylis miliaceae. • Broad leaved weeds: This is the major group of weeds. All eeeeeeedicotyledon weeds are broad leaved weeds.
  • 11. BASED ON NATURE OF STEM • Woody weeds: Weeds include shrubs and undershrubs and are collectively A called brush weeds. Eg. Lantana camera, Prosopis juliflora • Semi-woody weeds: eg.Croton sparsiflorus • Herbaceous weeds: Weeds have green, succulent stems are of most Q QQ common occurrence around us. Eg. Amaranthus viridi
  • 12. BASED ON SPECIFICITY • Poisonous weeds:- Eg. Datura fastuosa, D. Stramonium • Parasitic weeds:- It is further divided into 4 types:- 1. Total root parasite – Orabanche cernua on Tobacco 2. Partial root parasite – Striga lutea on sugarcane and sorghum 3. Total stem parasite – Cuscuta chinensis on leucerne and onion 4. Partial stem parasite – Loranthus longiflorus on mango and other trees
  • 13. • Aquatic Weeds :- These are divided into 4 types :- 1. Submersed weeds :- Eg:- Utricularia stellaris, Ceratophyllum demersum. 2. Emersed weeds :- Eg. Nelumbium speciosum, Jussieua repens. 3. Marginal weeds :- Typha, Polygonum, Cephalanthus, Scirpus, etc. 4. Floating weeds :- Eichhornia crassipes, Pistia stratiotes, Salvinia, e ee Nymphaea pubescens.
  • 14. THANK YOU SUBMITTED TO:- DR. RAJESH KALASARE