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12
Jul

Perennial sedges - Cyperus rotundus L. (Purple nut sedge)

 

Family: Cyperaceae Description: One of the worlds worst weed, Height -15-60 cm. - The plant is swollen and thickened at the base. It has triangular smooth scape, 10 to 60 cm in height, arising from the centre of a basal cluster of narrow grass like leaves of 30-50 cm long and 8 mm wide. - The leaves are smooth shiny, dark green and grooved on the upper surface.
12
Jul

Annual sedges - Cyperus iria L.

 

 

Family: Cyperaceae Description: - Widely distributed species in paddy fields Stems 15 to 50 cm high, trigonous

12
Jul

Annual grass weed - Echinocloa crusgalli ssp.

Family: Poaceae Description: - Tufted annual grass. - Height - 30- 60 cm with thick, coarse, mostly erect smooth and branching at the base. - Sessile leaf blades attached to a smooth sheath which encircles the stem in the absence of ligule. The leaf blade is 10-30 cm long and 5-20 mm wide. Midrib is prominent. - Stem is stout. Culms branches at the base and produce tille

Family: Pontederiaceae Description: - Root stock short and sub erect - Leaves linear or narrowly ovate with cordate base 5 to 15 cm long - Propagation - seed and root stock. - Thrives well in moist places
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