Rice Weeds Factsheets

Barnyard grass (Eichinocloa colona; Eichnocloa crus-galli)

Barnyard grass is an annual tropical wild grass which grows in warm and damp areas. The genus Eichnocloa consists of about 50 weed species, mainly found in the tropics, particularly in rice growing areas of Asia and Africa.

Bermuda grass, Cynodon dactylon.

Bermuda grass is a perennial grass found in the tropical and sub-tropical regions. It occurs in both upland and lowlands ecologies.

Billy goat weed (Ageratum conyzoides, L.)

Goat weed is an aromatic annual invasive plant that invades cultivated fields, pastures, roadsides or forests.

Broad-leaf weed management in rice

The critical period for weed management is 30-45 days after transplanting and 15-45 days for direct seeded rice. 

Purslane (Portulaca olareacea)

This is an annual succulent weed that grow rapidly and is able to produce numerous seed within 6-8 weeks.

Red Sprangletop (Leptochloa chinensis, L.)

Sprangletop is a perennial grass which grows in swampy lands

Striga (Striga hermonthica) in upland rice

Striga (also called witch weed) is a broadleafed parasitic weed known for its unique purple flowers.

Water hyacinth (Eichhornia crassipes)

Water hyacinth is a free floating perennial water weed.

Water lettuce (Pistia stratiotes L.)

Water lettuce is a free floating water weed that resembles the head of cultivated lettuce. It is usually found as a floating mass of light green leaves on the water surface.

Wood sorrels (Oxalis species)

Wood sorrel includes species in the genus Oxalis, such as the yellow oxalis and pink oxalis named after the colour of their flowers.