1. How to Use Herbicides Containing Propisochlor + Bensulfuron-methyl

Recommended application rate

Depending on commercial formulation and weed pressure:

1.0 – 1.5 kg/ha (adjust according to weed density).

Formulations may include granules or wettable powder, applied directly and uniformly across the field.

Application timing

Best applied during:

• Pre-emergence to very early post-emergence stages of weeds.

• 1–5 days after sowing, or 3–7 days after transplanting.

Field conditions

• Maintain 3–5 cm of standing water.

• Avoid water flow or drainage for 24–48 hours after application.

• If the field is too dry or water-stressed, herbicide efficacy will be reduced.

Application technique

• Apply evenly and uniformly across the field.

• If using spray application:

  • Mix according to product recommendation, agitate thoroughly, and spray evenly.

Repeat treatments

• Re-application is not required if applied at the correct timing.

• If weed pressure is very high or emerged weeds decline slowly → supplementary treatment with a post-emergence herbicide may be necessary.

2. Technical Information on Propisochlor + Bensulfuron-methyl

Propisochlor (160 g/kg)

• Chemical group: Chloroacetamide.

• Controls annual grasses (barnyardgrass, Echinochloa spp.) and some broadleaf weeds.

• Strong pre-emergence activity.

• Stable and persistent under typical field conditions.

Bensulfuron-methyl (40 g/kg)

• Chemical group: Sulfonylureas (selective systemic herbicide).

• Highly effective on broadleaf weeds and sedges (Cyperus spp., Monochoria, Ludwigia, etc.).

• Systemic, inhibits growth and cell division.

• Widely used and well-suited for paddy rice ecosystems.

Advantages of combining both active ingredients

• Wider weed control spectrum: grasses + broadleaf weeds + sedges.

• Dual action timing: pre-emergence + early post-emergence.

• Multi-site weed suppression, reducing resistance pressure.

• Ideal for wetland rice fields, especially mixed-weed infestations.

3. Herbicide Benefits (Corrected)

Effective control of multiple weed groups in rice

• Grasses: Echinochloa, Leptochloa, and related species.

• Broadleaf weeds: Monochoria, Ludwigia, Ammania, etc.

• Sedges: Cyperus difformis, C. iria, Fimbristylis spp.

Controls weeds from the earliest stages

• Acts before weed emergence or at early seedling stage.

• Minimizes early-season weed competition.

Long-lasting effect

• Residual activity 10–20 days depending on soil and water conditions.

• Keeps the field clean, allowing rice plants to tiller vigorously.

Selective and safe for rice

• Does not cause leaf burn.

• Very low risk of phytotoxicity when used correctly.

4. Mode of Action of Propisochlor + Bensulfuron-methyl

Propisochlor – Inhibition of Protein & Lipid Synthesis

• Blocks protein and lipid biosynthesis.

• Prevents cell division in weed seedlings.
  
  → Weeds fail to emerge or die shortly after emergence.

Bensulfuron-methyl – ALS (Acetolactate Synthase) Inhibitor

• Inhibits ALS enzyme, blocking synthesis of essential amino acids (valine, leucine, isoleucine).
  
  → Weeds stop growing and die within 3–7 days.

Safety Precautions When Using Herbicides

• Keep out of reach of children.

• Do NOT eat, drink, or smoke while handling or applying the product.
  
  Do not store the product near food, feed, or household items.

• Avoid inhalation and contact with eyes, nose, and skin.
  
  If exposure occurs, move away from the treated area immediately.

• Wear appropriate personal protective equipment (PPE):
  
  Protective clothing, gloves, mask/respirator, and safety goggles.

For Technical Support – Contact Us

THUAN THANH PHAT Plant Protection Chemical Manufacturing Joint Stock Company

HOTLINE: 0822.610.555

Address: Lot A22.1B, D7 Street, Thanh Thanh Cong Industrial Park, Trang Bang, Tay Ninh

Website: thuanthanhphat.com.vn

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