Rice is one of the most important crop in the world. The main production countries are China, India, Indonesia, Bangladesh, Viet Nam. Becides the Asian countries, rice is also welcomed as staple food in South America and Africa countries. Weed control is important in rice cultivation. Main weeds are grassy weed, broadleaf weed and sedges. Usually, the emergence of grassy weed is ealier than other types of weeds and the damage is heavier. Echinochloa spp is a big problem as main grassy weed in rice field. Here are some several herbicides suggested for weed control in rice field. Control of grassy weeds: Oxaziclomefone, Bispyribac-sodium, Cyhalofop-butyl. Control of broadleaf weed and sedges: Bentazon, Bentazon + MCPA. Pre-emergence is a cost-effective way, here are several combinations: Bensulfuron-methyl + Metolachlor, Bensulfuron-methyl + Pretilachlor, Bensulfuron-methyl + Mefenacet. If you are interested in any of these products or have some othe ideas about weed control in rice field, feel free to contact us. Contact: Susan E-mail: susan@profirst.biz ; agsale@profirst.biz Website: www.profirst.cn Skype: susan_hujiali@hotmail.com

1. Weed Control in Rice Field
From Shanghai Profirst Co., Ltd.
By Susan

2. (the Top 5 Countries in 2013)
Picture from FAOSTAT
(Share by Region in 2013)
Picture from FAOSTAT
World Rice Production

3. Cultivation of Rice
Cultivation
Direct-seeded Rice
Field, Wet or Dry
Rice Seedling Bed
Transplanted Rice
Field
By Throwing
Transplant by
Machine
Transplant by Hand
Higher
request for
herbicide
safety to rice

4. Types of Weeds in Rice Field
• Grassy Weeds
• Echinochloa crusgalli (L.) Beauv.
• Leptochloachinensis(L.) Nees
• Broadleaf Weeds
• Potamogeton distinctus A.Benn.
• Monochoriavaginalis(Burm.f.)
• Sagittaria trifolia
• Sedge Weeds/ Cyperaceae
• Cyperus difformis L．
• Scirpus planiculmis Fr．Schmidt
• Eleocharis yokoscensis(Franch.et Sav.)Tang et Wang

5. Weed Occurrence Rule in Rice Field
Grassy Weeds
Broadleaf Weeds
Cyperaceae
Larger
Amount & Damage !!!
5-10days
after
Sow or
Transplant
15-20days
after
Weed Occurence

6. • Strong adaptability to the environment
• Uncompleted control in early stage make it
very worse and difficult to control later
• Cumulative vital seeds survive in soil make the
weed base bigger year after year
• Serious herbicide resistance (Propanil,
Quinclorac, etc.)
Echinochloa crusgalli
Varieties between species

7. • Strong adaptability to the environment
• Uncompleted control in early stage make it worse and difficult to control later
•Cumulative vital seeds survive in soil make the weed base bigger year after year
Leptochloa chinensis

8. Control of Grassy Weeds
• Oxaziclomefone
• Bispyribac-sodium
• Cyhalofop-butyl

9. Oxaziclomefone
• Advantages:
• New mode of action
• High herbicidal activity, especially for Echinochloa crusgalli and Echinochloa
oryzicola
• Applied in different rice field, direct-seeded or transplanted
• Safe to rice and rotational crops
• Wide application time range
• Long residual activity
• Save the labor
• Notes:
• Keep the flooded layer of 1-3cm when applied to transplanted rice field
• Formulations:
• Oxaziclomefone 97% TC, Oxaziclomefone 1% SC

10. Bispyribac-sodium
• Advantages:
• High herbicidal activity
• Wide weed control
• Active against 1-7 leaf stages of Echinochloa spp
• Notes:
• Suggested for direct-seeded rice field, wet or dry
• Applied after rice of 5 leaf stage, or injury may occur
• Low temperature may decrease the herbicidal ability
• Hydrolysis under high temperature
• Degradation under low pH condition
• Used with Organo-silicone surfactant PASS to get a better control
• Formulations:
• Bispyribac-sodium 95% TC, Bispyribac-sodium 40% WP, Bispyribac-sodium
10% SC

11. Cyhalofop-butyl
• Advantages:
• Safe to rice
• Effective against Propanil- or Quinclorac-resistant Echinochloa
• High active against Leptochloa chinensis
• Notes:
• Only applied post-emergence
• Do not use with Sulfonylurea herbicides as antagonism may occur
• Formulations:
• Cyhalofop-butyl 97% TC, Cyhalofop-butyl 20% OF, Cyhalofop-butyl 10% EC,
Cyhalofop-butyl 10% EW

12. Cyperus difformis L．
Monochoriavaginalis
(Burm.f.)
Potamogeton
distinctus A.Benn.
Sagittaria trifolia
Scirpus planiculmis
Fr．Schmidt
Eleocharis yokoscensis
(Franch.et Sav.)Tang et
Wang
Sedge
BroadleafWeed

13. Control of Broadleaf Weeds and Sedge
• Bentazon
• Bentazon + MCPA

14. • Bensulfuron-methyl + Metolachlor
• Bensulfuron-methyl + Pretilachlor
• Bensulfuron-methyl + Mefenacet
the Most Cost-effective Way of Weed Control
Make Control Later Easier
Pro-emergence Control

15. Contact Us:
Shanghai Profirst Co., Ltd.
Website: www.profirst.cn
E-mail: agsale@profirst.biz
Tel: 0086 21 38122007
Fax: 0086 21 38122006