Mesotrione
What is Mesotrione?
Mesotrione is a selective systemic herbicide belonging to the triketone class of chemistry. It provides excellent pre- and post-emergence control of broadleaf weeds and some grass weeds in corn crops.
Key Features of Mesotrione
- Highly effective against resistant weed species
- Provides both contact and residual activity
- Excellent crop safety when used as directed
- Rainfast within 1 hour of application
- Flexible application timing (pre-emergence to early post-emergence)
Technical Specifications
| Parameter | Specification |
|---|---|
| Chemical Name | 2-[4-(methylsulfonyl)-2-nitrobenzoyl]-1,3-cyclohexanedione |
| CAS Number | 104206-82-8 |
| Molecular Formula | C14H13NO7S |
| Molecular Weight | 339.32 g/mol |
| Formulation | 480 g/L suspension concentrate (SC) |
| Solubility | 2.2 g/L in water at 20°C |
Mesotrione Application Guide
| Crop | Weeds Controlled | Application Rate | Timing |
|---|---|---|---|
| Field Corn | Velvetleaf, Lambsquarters, Pigweed | 100-150 mL/ha | Pre-emergence to V4 corn stage |
| Sweet Corn | Ragweed, Nightshade, Mustard | 75-125 mL/ha | Pre-emergence to V6 corn stage |
| Seed Corn | Foxtail, Barnyardgrass | 100-150 mL/ha | Pre-emergence to V3 corn stage |
Mesotrione FAQ Section
1. What is the mode of action for Mesotrione?
Mesotrione inhibits the enzyme 4-hydroxyphenylpyruvate dioxygenase (HPPD), which is essential for carotenoid biosynthesis in plants. This leads to bleaching of new growth as chlorophyll is destroyed, ultimately causing plant death.
2. How long does Mesotrione remain active in soil?
The soil half-life of Mesotrione typically ranges from 5 to 15 days, depending on soil type and environmental conditions. Under normal field conditions, Mesotrione degrades completely within 30-60 days after application.
3. Can Mesotrione be tank-mixed with other herbicides?
Yes, Mesotrione is compatible with many other herbicides including atrazine, glyphosate, and S-metolachlor. Always conduct a jar test before mixing and follow label recommendations for proper application sequences and rates.
Environmental Profile of Mesotrione
- Low toxicity to mammals (LD50 > 5000 mg/kg)
- Not persistent in aquatic environments
- Minimal leaching potential in most soils
- Rapidly degraded by microbial action
- Low volatility
Handling and Storage
| Aspect | Guidelines |
|---|---|
| Storage Temperature | Keep between 5°C and 35°C |
| Shelf Life | 2 years from manufacture date |
| Container Type | Original sealed containers only |
| Protective Equipment | Gloves, goggles, long sleeves during handling |
Mesotrione Benefits
- Provides season-long weed control with single application
- Controls weeds resistant to other herbicide classes
- Flexible application timing window
- Excellent compatibility in tank mixes
- Favorable environmental profile
Additional Mesotrione FAQs
4. What weeds show resistance to Mesotrione?
While rare, some populations of waterhemp and Palmer amaranth have developed resistance to Mesotrione. Resistance management through rotation with other herbicide modes of action is recommended.
5. What are the symptoms of Mesotrione phytotoxicity?
Treated weeds typically show bleaching of new growth within 3-5 days, followed by necrosis. In rare cases of crop injury, temporary yellowing or stunting may occur but plants normally recover quickly.
6. Is Mesotrione safe for pollinators?
Yes, Mesotrione has very low toxicity to bees and other pollinators when used according to label directions. However, avoid direct application to blooming weeds that might attract pollinators.
Application Technology
For best results with Mesotrione:
- Use flat fan nozzles (80-110° angle) for broadcast applications
- Maintain spray pressure between 20-40 psi
- Apply in 20-40 gallons of water per acre
- Incorporate within 7 days if applying pre-emergence to dry soils
Conclusion
Mesotrione remains one of the most effective and versatile herbicides for corn production. Its unique mode of action and flexible application timing make it an essential tool for modern weed management programs. When used according to label directions and as part of an integrated weed management approach, Mesotrione provides excellent weed control with minimal environmental impact.