WEEDS
IDENTIFICATION
Prepared by:
Frandz Luna Gabronino
MS Agriculture- Crop Protection
WHAT IS WEEDS?
✓ unwanted plants and must be destroyed (Bailey and Bailey
1941)
✓ A plant growing where is not desired (Weed Science
Society of America 1956)
✓ A plant is a weed (Zimmerman 1976)
a. colonizes and disturbs habitat
b. is not part of natural community but abundant locally
c. noxoius, troublesome and economically of little value
WEED CLASSIFICAT ION
BASED ON GROSS
MORPHOLOGY
GRASSES
Range from small,
twisted, erect, or creeping
annuals and perennials. Stems
are called culms with well-
defined nodes and internodes.
Leaves arise alternately in two
rows from the nodes. The leaf
is composed of two parts, the
leaf sheath, and the leaf blade.
“Goose Grass”
Paspalum conjugatum
“Sour paspalum” “Knot grass”
“Kodo millet” “Yellow Watercrown Grass”
Brachiaria distachya
Armgrass Millet/ Green summer grass
“Natal Red Top”
“Spring Grass” or “Cup Grass”
“Southern Cutgrass” or “Clubhead Cutgrass”
“Sprangletop”
“Torpedo Grass”
“Wild Sugarcane”
Jungle rice Barnyard Grass
Early Barnyard
Rottboella cochinchinensis
Pennisetum polystachion
Mission Grass Napier Grass
Bristle Grass
Saramolla Grass
Southern sandbur / Spiny sandbur
Leersia hexandra Sw.
“Southern cutgrass”
Ischaemum rugosum Salisb.
“Wrinkled grass, Saramollagrass”
Leptochloa chinensis (L.) Nees
“Chinese sprangletop, Red sprangletop”
Oryza sativa L.
“Weedy rice, Red rice”
Paspalum scrobiculatum L.
“Kodo millet”
Panicum repens L.
“Torpedo grass”
SEDGES
Narrow elongated leaves
differs from grasses by their
distinguishing triangular stem.
“Shortleaf spikesedge” / “Green kyllingia”
“White kyllingia”
“Small flower umbrella plant”
“Compact Sedge”
“Shingle flatsedge”
“Rice flatsedge”
“Purple Nutsedge”
“Poorland flatsedge”
“Forked fimbry”
“Grasslike fimbry”
“Saltmarsh bulrush” “Sharpscale bulrush”
Cyperus digitatus
“Greater Club Rush” “Finger flatsedge”
Scirpus juncoides Roxb.
“Bulrush”
BROAD-LEAVES
Shorter but wider leaves with either parallel or netted venation.
“Slender Amaranth” “Spiny Amaranth”
“Plumed Cockscomb” “Gooseweed” / “Chickenspike”
“Climbing dayflower” / “ Spreading dayflower”
“Benghal dayflower” / “ Tropical spiderwort”
“Water lettuce”
“Indian pennywort” / “Asiatic pennywort” / “Gotu kola”
“Goat weed” / “Tropic ageratum” “Beggarticks” / “Cobblers pegs”
“Devil Weed” “Horseweed”
“Redflower ragleaf”
“Red tasselflower”
“False Daisy” “Gallant soldier”
“Elephant’s foot” “Common sowthistle”
“False Elephant’s foot” “African Globe Thistle”
“Cinderella weed” / “Nodeweed”
“Tridax”
“Indian Heliotrope” “Jamaica vervain”
“Devil’s horsewhip”
“Lantana”
Drymaria cordata
“Little ironweed” “Tropical chickweed”
“Sicklepod”
“Coffee senna”
“Fringed spiderflower”
“Asian spiderflower” / “Tickweed”
“Purple-leaved Button Weed”
“White broomweed”
“Common chickweed”
“Corn spurry”
“Doveweed”
“Doveweed”
“Three-lobe morning glory”
“Tiger foot morning glory”
“Water spinach” / “Kangkong”
“Chinese moon creeper” / “Arrow-leaf morning glory”
“Indian gooseberry” / “Seed under leaf”
“Egyptian riverhemp”
“Garden spurge”
“Prostrate sandmat” / “Prostrate spurge”
“Milkweed” / “Wild poinsettia”
“Castor bean” / “Castor oil plant”
“Lesser roundweed” “False ironwort” / “Knobweed” “Pignut”
“Roadside Leafbract”
“Bracken fern”
“Cuban jute” / “Indian hemp” “Common wireweed”
“Three-lobed false mallow”
“Dwarf water clover” / “Pepperwort”
“Creeping woodsorrel”
“Giant sensitive plant” “Female sensitive plant”
“Indian jointvetch”
“Three-flower beggarweed” “Calopo”/ “Wild groundnut”
“Red spiderling” “Erect spiderling”
“Perennial water primrose”
“Centro” / “Butterfly pea”
“Stinking passionflower” /
“Red fruit passion flower”
“Shakeshake”
“Shakeshake”
“Sunn hemp”
“Fiveleaf crotalaria”
Commelina benghalensis L.
“Tropical spiderwort”
Commelina diffusa Burm. f.
“Spreading dayflower”
Ageratum conyzoides L.
“Tropic ageratum”
Alternanthera sessilis
“Sessile joyweed”
Eclipta prostrata (L.) L.
“False daisy”
Eichhornia crassipes (Mart.) Solms
“Water hyacinth”
Ludwigia octovalvis (Jacq.) Raven
“Longffruited primrose-willow”
Ludwigia adscendens (L.) Hara
“Creeping water primrose”
Monochoria vaginalis (Burm. f.) C. Presl.
“Monochoria”
Marsilea minuta L.
“Water clover”
Sphenoclea zeylanica Gaertn.
“Gooseweed”
Polygonum hydropiper L.
“Marsh-pepper smartweed, water pepper”
Trianthema portulacastrum L.
“Horse purslane, Giant pigweed”
Top 10 Worst Weeds
1. Purple Nutsedge 2. Bermuda Grass
Cyperus rotundus Cynodon dactylon
3. Barnyard Grass 4. Jungle Rice
Echinochloa crus-galli Echinochloa colona
5. Goose Grass 6. Johnson Grass
Eleusine indica Sorghum halepense
7. Cogon Grass 8. Water hyacinth
Imperata cylindrica Eichhornia crassipes
9. Purslane 10. Fat Hen/ Lamb Quarter
Portulaca oleracea Chenopodium album
