1. Good to control barnyard grass. Barnyard grass shows obvious symptoms 3-5 days after treatment and dies 7-15 days after treatment.
2. Very safe to rice, especially to early and late indica rice.
3. No side-effects on growth and yield of rice.

Barnyard Grass, Monochoriapauciflora（Bl.）Kunth., Ludwigia and other annual weeds.

Direct-sowing Rice（stem and foliar spraying）.

1.Dosage：
Dosage depends on the density and leaf age of weeds, high density and elder weeds need larger dosage. If barnyard grass is over 5 leaf stage or above one tiller stage, then apply with 1.33g/l-1.67g/l Quinclorac 50% WP mixed inbucket.

2. Water layer management：shallow-layer (at least moist soil) is needed when spraying and make sure 2/3 of weed stems and leaves are out of water. Refill water within 1-3 days after spraying; keep the height of water layer at 2-3cm for 5-7 days.

3. Weather influence：As high temperature and drought may reduce the efficacy, avoid spraying at high temperature especially at noon. Irrigate the dry rice field before treatment. Low temperature(<15℃) during spraying may cause slightly yellowing phenomenon of the leaf, but it will disappear within 2 weeks and would not affect the yield.

4. For the direct-sowing rice field with better water management, more barnyard grass and less Leptochloa chinensis, treatment should be applied after all barnyard grass comes out, and the dosage should be based on the leaf age of the barnyard grass.

5. For the dry direct-sowing rice field with poor water management, there are a lot of both Leptochloa chinensis and barnyard grass, Leptochloa chinensis comes out later than barnyard grass, treat with Penoxsulam 2%•Pyrazosulfuron-ethyl 2% OD firstly, use Cyhalofop-butyl one week later.

6. Small-scale experiments should be conducted before applying other insecticides and fungicides (mixed in bucket), or consult local department of plant protection.