Penoxsulam 25g/L OD Herbicide | Selective Post-Emergent Weed Control

Penoxsulam 25g/L OD (Oil Dispersion) is a premium selective herbicide designed for post-emergent control of broadleaf weeds, sedges, and some grasses in rice, sugarcane, and turfgrass. As a member of the triazolopyrimidine sulfonamide family, it inhibits acetolactate synthase (ALS), disrupting amino acid biosynthesis in target plants. The OD formulation ensures excellent spreading and penetration on waxy leaf surfaces, providing superior efficacy even under low-moisture conditions.

Technical Specifications

Parameter	Details
Active Ingredient	Penoxsulam (CAS No. 219714-96-2)
Chemical Class	Triazolopyrimidine sulfonamide
Mode of Action	ALS inhibitor (HRAC Group 2)
Formulation Type	25g/L OD (Oil Dispersion)
Appearance	Milky white oil-based suspension
Solubility	0.33 g/L in water (20°C)
pH Range	5.5–7.5
Density	0.98–1.02 g/cm³

Mode of Action

Systemic Uptake:
- Absorbed through leaves and roots, translocated via xylem and phloem to meristems.
Biochemical Inhibition:
- Blocks ALS enzyme, preventing synthesis of branched-chain amino acids (valine, leucine, isoleucine).
Symptom Progression:
- 5–7 days: Growth cessation and chlorosis in new leaves
- 14–21 days: Widespread necrosis and plant death

Application Guide

Crop	Target Weeds	Dosage (L/ha)	Application Timing
Rice	Barnyardgrass, Monochoria, Cyperus	0.4–0.6	2–4 leaf stage of weeds (3–5 cm tall)
Sugarcane	Yellow nutsedge, eclipta	0.5–0.8	Post-emergence, 3–6 leaf stage
Turfgrass	Crabgrass, annual bluegrass	0.3–0.5	Early post-emergence

Application Tips

Water Volume: 150–300 L/ha for rice; 200–400 L/ha for sugarcane
Adjuvants: Add methylated seed oil (MSO, 1% v/v) for enhanced penetration
Tank Mixes:
- With cyhalofop-butyl for grass control in rice
- With 2,4-D for broadleaf weeds in turf
Weather: Apply in cool, dry conditions; avoid spraying 24 hours before rainfall

Key Advantages

Broad-Spectrum Control:
- Controls over 40 weed species, including resistant biotypes (e.g., ALS-resistant Monochoria).
Residual Activity:
- Provides 14–21 days of soil residual control, reducing re-application needs.
Crop Safety:
- Formulated for minimal phytotoxicity in rice, sugarcane, and tolerant turf varieties.
Flexible Application:
- Suitable for flood-irrigated rice, dry-seeded rice, and post-emergent applications.
Environmental Profile:
- Low mammalian toxicity (LD₅₀ > 5000 mg/kg)
- Rapid soil degradation (DT₅₀ 7–14 days)

Safety & Environmental Notes

Toxicity:
- Low toxicity to birds (LD₅₀ > 2000 mg/kg)
- Moderate toxicity to fish (LC₅₀ 1–10 mg/L); avoid water bodies.
Storage:
- Store at 5–35°C; protect from freezing.
Handling:
- Wear protective clothing; avoid inhalation and skin contact.

Packaging & Compliance

Standard Packs: 1L, 5L, 20L COEX containers
Custom Solutions:
- Private labeling with multilingual instructions
Shelf Life: 3 years under recommended storage conditions

FAQ

Q1: Can Penoxsulam 25g/L OD be used in wheat or barley?
A: No, it is registered for rice, sugarcane, and turfgrass only.

Q2: What is the pre-harvest interval (PHI)?
A: PHI varies by crop:

Rice: 45 days
Sugarcane: 60 days
Turfgrass: No restrictions (non-food crop)

Q3: How to handle resistance management?
A: Avoid consecutive applications; rotate with Group 15 (e.g., acetochlor) or Group 14 (e.g., fomesafen) herbicides.

Q4: Can it be used in flooded rice fields?
A: Yes, but ensure uniform coverage and maintain floodwater for 3–5 days post-application.

Q5: What is the difference between OD and SC formulations?
A: OD formulations offer better adhesion and penetration on waxy leaves, while SC (Suspension Concentrate) is more water-soluble.

Field Performance

Rice Trials in China:
0.5 L/ha controlled 98% of Monochoria vaginalis and Cyperus difformis at 28 days post-application.
Sugarcane Trials in Brazil:
0.6 L/ha + MSO reduced yellow nutsedge density by 90%, improving cane yield by 15%.

Residue Limits

Crop	MRL (mg/kg)	Regulatory Region
Rice	0.02	EU, Codex Alimentarius
Sugarcane	0.05	EPA, China
Turfgrass	N/A	Non-food crop

Contact us for technical data sheets, custom formulations, or bulk pricing.
Tailored solutions for distributors and large-scale agricultural operations.

The application rate of Penoxsulam 25g/L OD varies by crop, target weeds, and regional practices. Below is a summary of recommended rates and key application guidelines:

Application Rates (L/ha)

Crop	Target Weeds	Rate (L/ha)	Growth Stage
Rice	Barnyardgrass, Monochoria, Cyperus	0.4–0.6	2–4 leaf stage (3–5 cm tall)
Sugarcane	Yellow nutsedge, eclipta, annual grasses	0.5–0.8	Post-emergence (3–6 leaf stage)
Turfgrass	Crabgrass, annual bluegrass, sedges	0.3–0.5	Early post-emergence

Key Application Guidelines

Water Volume:
- Rice: 150–300 L/ha
- Sugarcane/Turf: 200–400 L/ha
Adjuvants:
- Always add methylated seed oil (MSO, 1% v/v) to enhance leaf penetration and efficacy.
Timing:
- Apply to actively growing weeds before they reach 5 cm height.
- In rice, apply 5–10 days after transplanting or when direct-seeded rice has 2–3 leaves.
Tank Mixes:
- Rice: Combine with cyhalofop-butyl for grass control.
- Sugarcane: Tank-mix with 2,4-D for broadleaf weeds.

Example Calculation

For rice with heavy Monochoria infestation:

Apply 0.6 L/ha of Penoxsulam 25g/L OD
Mix with 1% MSO (600 mL/ha)
Use 200 L/ha water volume

Precautions

Resistance Management: Avoid consecutive applications; rotate with Group 15 (e.g., acetochlor) or Group 14 (e.g., fomesafen) herbicides.
Crop Safety: Do not apply to stressed crops (e.g., drought, flooding).
Environmental: Maintain 100 m buffer from water bodies to protect aquatic life.

For specific regional recommendations or custom formulations, contact your local agricultural extension service or supplier.