Weed control in rice

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

By Susan

World Rice Production

(Share by Region in 2013) Picture from FAOSTAT

(the Top 5 Countries in 2013) Picture from FAOSTAT

Cultivation of Rice Direct-seeded Rice Field, Wet or Dry

Cultivation

Rice Seedling Bed

By Throwing

Transplanted Rice Field

Transplant by Machine

Transplant by Hand

Higher request for herbicide safety to rice

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

Weed Occurrence Rule in Rice Field Larger Amount & Damage !!!

Grassy Weeds Weed Occurence

Broadleaf Weeds Cyperaceae

Sow or Transplant

5-10days after

15-20days after

Varieties between species

Echinochloa crusgalli • 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.)

Leptochloa chinensis

• 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

• Oxaziclomefone

• Bispyribac-sodium • Cyhalofop-butyl

Control of Grassy Weeds

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

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

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

Sedge

Sagittaria trifolia

Eleocharis yokoscensis (Franch.et Sav.)Tang et Wang

Monochoriavaginalis (Burm.f.)

Cyperus difformis L

Potamogeton distinctus A.Benn.

Broadleaf Weed

Scirpus planiculmis FrSchmidt

• Bentazon • Bentazon + MCPA

Control of Broadleaf Weeds and Sedge

• Bensulfuron-methyl + Metolachlor • Bensulfuron-methyl + Pretilachlor

• Bensulfuron-methyl + Mefenacet

Pro-emergence Control the Most Cost-effective Way of Weed Control Make Control Later Easier

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