PRODUCTONG PATUNGKUL SA mga damo
Plants growing where they
are not wanted
Weeds seriously:
• reduce yields of crops by competing
for water, nutrients & light
• harbor plant diseases & insects
• interfere with field operations and
activities
In small and medium scale farms,
manual weed control may account up to
70% of total agricultural labor
Mga Klaseng Damo
Annual weeds
• complete lifecycle within a year
• propagated only by seeds in abundant supply
• Examples: itchgrass (Rottboellia), goosegrass (Eleusine)
Biennial
• grow vegetative during the first year, then produce fruit and
die the second year
Perennial weeds
• Propagated by seeds, tubers, crown buds and stems, or
rhizomes that grow underground or along the top of soil
• The root-rhizome systems retain viability year to year
• Persistent and difficult to control
• Examples: purple nutsedge (Cyperus), cogon (Imperata),
dayflower (Commelina)