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