Description
Topramezon
### **1. Excellent Weed Control**
✅ **Targets Tough Weeds**:
– **Broadleaf weeds** (pigweed, ragweed, velvetleaf)
– **Grassy weeds** (foxtail, barnyardgrass, crabgrass)
– **Sedges** (yellow nutsedge)
✅ **Rapid Action**:
– Causes **bleaching & necrosis** in weeds (visible in **3–5 days**).
– Full weed death in **2–3 weeks**.
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### **2. Crop Selectivity (Safe for Corn & Turf)**
✔ **Highly selective** for **corn (field & sweet)** due to natural metabolic resistance.
✔ Used in **turfgrass** (golf courses, sod farms) without harming desirable grasses.
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### **3. Flexible Application**
🌱 **Post-emergence use** (spray after weeds emerge).
💧 **Rainfast within 1 hour**—reduces wash-off risk.
🔄 **Tank-mix friendly**—often combined with **atrazine, dicamba, or glyphosate** for enhanced control.
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### **4. Low Use Rate & Environmental Profile**
🔹 **Low application rate** (typically **12.5–25 g/ha**).
🌍 **Lower soil persistence** (degrades faster than atrazine).
🐝 **Safer for pollinators** when used as directed (no neonicotinoid-like bee risks).
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### **5. Resistance Management**
🛡️ Effective against **glyphosate-resistant weeds** (e.g., Palmer amaranth).
🔄 Useful in **herbicide rotation programs** to prevent weed resistance.
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### **Trade Names**
– **Impact®** (corn)
– **Clio®** (turf)
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### **Comparison with Similar Herbicides**
| Feature | Topramezone | Mesotrione (Callisto®) | Atrazine |
|——————|——————-|———————–|—————–|
| **Mode of Action** | HPPD inhibitor | HPPD inhibitor | PSII inhibitor |
| **Speed** | Fast (3–5 days) | Moderate (5–7 days) | Slow (weeks) |
| **Best For** | Corn, turf | Corn, sugarcane | Corn, sorghum |
| **Soil Residual** | Low | Low | High |
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### **Limitations**
⚠ **Not for use in all crops** (only labeled for corn & turf).
⚠ **Can injure weeds only after emergence** (no pre-emergence activity).
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