Schoenoplectus juncoides (Roxb.) Palla
Scirpus juncoides Roxb. (basionym).
Asia: Japan and Korea.
Southeast and Southeast Asia: Bangladesh, Cambodia, India, Indonesia, Lao PDR, Malaysia, Myanmar, Nepal, Pakistan, Philippines, Sri Lanka, Thailand, and Vietnam.
Rest of the world: Australia, Ecuador, Fiji, Madagascar, and United States (Hawaii).
Biology and ecology
Found in lowland rice, shallow ponds, streams, and drains.
Emerges directly from seeds in puddled rice fields; in swampy areas where tillage is minimal, seedlings emerge from vegetative buds. Seed germination increases under anaerobic conditions.
In competition with rice, about 1,500 seeds are produced per plant.
Can be a major weed in lowland rice fields.
Cultural: dry rotovation and wet puddling can reduce populations.
Chemical: Pretilachlor, butachlor, thiobencarb, and sulfonylureas are reported to be effective in rice.
JLA Catindig, RT Lubigan, and D Johnson