Barnyard grass / jungle rice (Echinochloa)
A rice-mimicking grass — the number-one grassy weed of paddy, also serious in maize — that thrives in the warm, flooded conditions rice needs.
- Type
- Grassy weed (annual)
- Life cycle
- Annual, seed-propagated
- Spreads by
- Seed; water & crop-seed contamination
- Main harm
- Competes with rice/maize; heavy yield loss
Overview
Barnyard grass (Echinochloa crus-galli) and jungle rice (Echinochloa colona) are the most important grassy weeds of rice, and also trouble maize, sugarcane and other summer crops. They germinate with the rice and closely resemble rice seedlings in the early weeks — a rice-mimic — so they are hard to rogue by hand and easy to miss. They grow fast, tiller heavily and compete strongly with rice for nitrogen, water, light and space, and can cause major yield loss in a heavy stand.
A big reason they dominate rice is that they thrive in exactly the warm, wet, flooded conditions rice grows in, and produce large amounts of seed that refill the seed bank. Direct-seeded rice is especially vulnerable. Management leans on good land levelling and water management (a well-levelled, timely-flooded field suppresses Echinochloa and favours the rice), clean weed-free seed, and timely pre- and post-emergence herbicides, with herbicide rotation to avoid resistance.
How to identify it
- Germinates with the rice and closely resembles rice seedlings in the early weeks (a rice-mimic).
- A key clue: unlike rice, it lacks a ligule/auricle at the leaf base, and the leaf sheath and stem base are often reddish/purplish.
- Grows fast, tillers heavily, and later carries a branched, often purplish seed head.
- Worst in warm, wet, flooded fields and especially in direct-seeded rice.
Why it is a problem
- Competes strongly with rice (and maize) for nitrogen, water, light and space, cutting yield heavily in a dense stand.
- Its rice-mimicking early growth makes it hard to rogue by hand and easy to miss when control matters most.
- It thrives in the same warm, flooded conditions rice needs, so it flourishes right alongside the crop.
- It produces large amounts of seed that refill the soil seed bank each year.
Cultural & preventive control
- Level the land well and manage water so timely flooding suppresses Echinochloa and favours the rice.
- Use clean, weed-seed-free certified seed, and transplant/establish a healthy, competitive crop.
- In direct-seeded rice, use stale-seedbed and good agronomy to give the crop the early edge.
- Prevent seed set — remove escapes before seeding to run down the seed bank.
Herbicide control
- Use recommended pre-emergence herbicides (e.g. pretilachlor/pendimethalin) and timely post-emergence herbicides (e.g. bispyribac-sodium and recommended products) for Echinochloa in rice.
- Apply at the correct stage, dose and water/soil-moisture condition, and rotate herbicide groups to avoid resistance.
- Combine herbicides with land levelling and water management for reliable control.
- Confirm the current herbicide, dose and timing for your crop with your local KVK.
Integrated management
- Combine land levelling, water management, clean seed, competitive establishment and timely herbicides.
- Rotate herbicide groups and prevent seed set to keep resistance and the seed bank down.
- In direct-seeded rice, plan early weed control carefully — Echinochloa is hardest there.
Crops most at risk
Where this problem is called out in our crop guides — open a crop for the full package of practices.
Frequently asked questions
How do I tell barnyard grass from my rice seedlings?
Early on it is genuinely hard — barnyard grass and jungle rice mimic rice seedlings. The most useful clue is at the leaf base: unlike rice, Echinochloa lacks a ligule and auricle, and its leaf sheath and stem base are often reddish or purplish. It also grows faster and tillers more, and later throws a branched, often purplish seed head. Because it is hard to tell apart by hand, land levelling, water management and timely herbicides do more than manual weeding.
Why does barnyard grass thrive in rice fields?
Because it loves exactly the warm, wet, flooded conditions that rice is grown in — so it flourishes right alongside the crop rather than being held back by the water. It also mimics rice early, tillers heavily and produces a lot of seed. That is why water management matters so much: a well-levelled field with timely, even flooding suppresses Echinochloa and favours the rice, whereas uneven, poorly-flooded fields let the weed get ahead.
Why is barnyard grass worse in direct-seeded rice?
Because in transplanted rice the crop starts as established seedlings with a head start and standing water that suppresses weeds, while in direct-seeded rice the crop and the weed germinate together on moist soil with no such head start, so Echinochloa competes on equal or better terms from day one. That is why direct-seeded rice needs especially careful early weed control — a good stale seedbed, timely pre- and post-emergence herbicides, and clean seed — to keep barnyard grass in check.
Symptoms and control measures follow ICAR, KVK and state agricultural-university package-of-practices; any named chemical is a registered use. Always read the product label and confirm the dose for your crop and zone. editorial policy.