Ametryn: A Selective Herbicide for Broadleaf and Grass Weed Control

Technical Introduction

Ametryn (IUPAC: N-ethyl-N′-(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine) is a selective, systemic triazine herbicide.

It is widely used for the control of broadleaf weeds and some grasses in crops such as sugarcane, maize, and pineapple.

• Mode of Action: Photosystem II (PSII) inhibitor — blocks electron transport in photosynthesis (HRAC Group C1).

• Systemicity: Absorbed mainly by roots and translocated within the plant.

• Selectivity: Safe for certain crops at recommended doses due to differential metabolism.

Applications

• Major Crops:

  • Sugarcane, maize, pineapple, banana, cassava, and coffee.

• Weed Spectrum:

  • Effective against annual broadleaf weeds such as Amaranthus spp., Chenopodium spp., Portulaca spp. and certain annual grasses like Digitaria spp. and Setaria spp..

• Application Timing:

  • Applied pre-emergence (before weed germination) or early post-emergence (when weeds are small).

• Formulation Use:

  • Often combined with other herbicides (e.g., atrazine or diuron) to broaden weed control.

Advantages

• Broad-Spectrum Control: Manages both broadleaf weeds and some grasses.

• Flexible Application: Can be applied pre- and early post-emergence.

• Residual Activity: Provides 4–8 weeks of soil residual control, reducing early-season weed competition.

• Crop Safety: Selective for crops like sugarcane and maize at labeled rates.

• Economic Efficiency: Cost-effective for large-scale crop protection.

Specifications (Typical Parameters)

FAQ

Q1: What crops is Ametryn safe for?
A: It is primarily used in sugarcane, maize, pineapple, banana, cassava, and coffee.

Q2: Does Ametryn control perennial weeds?
A: No, it is more effective on annual broadleaf weeds and grasses; perennials usually require additional control measures.

Q3: How long does Ametryn last in soil?
A: Residual activity is typically 4–8 weeks, depending on soil type and rainfall.

Q4: Can Ametryn be tank-mixed with other herbicides?
A: Yes, it is often mixed with Atrazine, Diuron, or Glyphosate for extended spectrum and resistance management.

Q5: Is Ametryn safe for the environment?
A: While it has moderate toxicity, it may pose risks of leaching into groundwater, so strict application guidelines must be followed.

Q6: What is the typical application rate?
A: Usually 1.0–3.0 kg a.i./ha, depending on crop and soil conditions.