How Quizalofop-p-ethyl Targets Grassy Weeds Without Damaging Your Crops

Introduction
Quizalofop-p-ethyl is a highly effective post-emergent herbicide specifically developed for controlling annual and perennial grassy weeds in broadleaf crop fields. Known for its selective action, it allows farmers to eliminate problem grasses while protecting vital crops such as soybeans, cotton, sugar beets, and vegetables.

What Is Quizalofop-p-ethyl?

Quizalofop-p-ethyl is an aryloxyphenoxypropionate (AOPP) herbicide, also known as a “FOP” herbicide. It works by inhibiting the ACCase enzyme (Acetyl-CoA carboxylase), which is crucial for lipid synthesis in grasses. Without this enzyme, weeds stop growing and die within days.

• Chemical name: Ethyl (R)-2-[4-(6-chloroquinoxalin-2-yloxy)phenoxy]propionate

• Mode of action: Systemic ACCase inhibitor

• Selectivity: Controls monocot weeds; safe for dicot crops

Key Benefits

1. Selective Weed Control

   • Kills grassy weeds like barnyardgrass, crabgrass, foxtail, and wild oats

   • Leaves broadleaf crops unharmed

2. Post-emergent Activity

   • Can be sprayed after both the weeds and crops have emerged

   • Flexible timing reduces pre-plant stress

3. Systemic Translocation

   • Absorbed by leaves and translocated to roots and growing points

   • Effective even against perennial weeds with underground rhizomes

4. Rainfast Within Hours

   • Fast uptake means light rain after application won’t wash it away

5. Compatible with Tank Mixes

   • Can be used with broadleaf herbicides for wider weed spectrum control

Recommended Applications

Note: Always follow local label instructions and consult agronomists for optimal dosage.

Application Guidelines

• Timing: Apply when grassy weeds are in 2–5 leaf stage

• Spray volume: 150–300 L/ha for good coverage

• Surfactants: Addition of adjuvants can improve absorption

• Environmental conditions: Best results under warm, humid weather

Compatibility and Resistance Management

• Mixing partners: Compatible with many broadleaf herbicides (e.g., bentazone, clopyralid)

• Resistance strategy: Rotate with other herbicide modes of action (e.g., ALS, PPO inhibitors) to delay resistance

Storage & Handling

• Form: EC (Emulsifiable Concentrate), typically 5–10%

• Storage: Keep in cool, dry place; avoid direct sunlight

• Safety: Use gloves and goggles during application; avoid inhalation

FAQs

Q: Can it be used in cereal crops like wheat or corn?
A: No. Quizalofop-p-ethyl targets grassy plants, so it is not safe for monocot crops like corn or wheat.

Q: How quickly do weeds die after application?
A: Growth stops within 1–2 days, with full weed death in 7–14 days depending on conditions.

Q: Is there a risk of drift damage to nearby crops?
A: Yes, especially to grass crops. Use low-drift nozzles and apply in calm weather.

Conclusion

Quizalofop-p-ethyl offers a powerful and selective solution to one of farming’s most persistent problems: grassy weed control in broadleaf crops. Its systemic action, quick absorption, and flexibility in use make it a go-to herbicide for modern precision agriculture. When used responsibly, it promotes higher yields, cleaner fields, and greater crop protection.