Recognize the problem
Cyperaceae (sedge family).
Common names: Lesser fimbristylis, fimbry, grass-like fimbristylis, grasslike
Vietnamese: Cỏ tò te, cỏ chat.
or perennial erect sedge with fibrous root system, without hairs, strongly
tillering up to 80−90 cm high.
Stiff and thread-like (1.5-2.5 mm wide), up to 40 cm long, no prominent
6−10 cm long, compound umbel with 6−50 spikelets; spikelets reddish brown,
2−4 mm long and either round or pointed at the tip.
angled straw-coloured or pale ivory nut, 0.2−0.3 mm long. Produces 10,000 seeds per plant which can
germinate immediately after reaching maturity. Seeds can remain viable for
more than one year.
As contaminated seed.
Common throughout the tropics; occurs
in damp, open waste places.
By seeds; dispersed by water, wind and human-related activities; seeds are
also eaten by cattle and germinate near droppings.
Most common and abundant in rice plantations; also found in bananas and maize
(Taiwan), sugarcane and maize (Indonesia) and sorghum (Malaysia).
Fimbristylis littoralis is a
serious weed in rice. It competes strongly with crops for light and nutrients,
can adversely affect rice germination and interferes with crop management. In
India, rice yield losses due to F.
littoralis (together with Cyperus
difformis and Scirpus
supinus) were estimated at 9% in transplanted rice in the dry
season and 24-32% in direct-sown rice in puddled conditions The weed can also
outcompete native vegetation. Fimbristylis littoralis is a secondary
host of pests and diseases such as rice earhead bug (Leptocorisa acuta), paddy armyworm (Mythimna separate)
and rice sheath blight (Rhizoctonia solani).