⚖️ Educational use only. Always read and follow the full product label — the label is the law under FIFRA. Full disclaimer → | ⚗️ Mixing Calculator →
🏷️ Brand Names — Same Active Ingredient
Meridian 25 WG — Syngenta — professional turf/ornamental
Flagship 25 WG — Syngenta — ornamental — same product as Meridian
Actara — Syngenta — agricultural foliar/systemic
Platinum — Syngenta — soil drench vegetables
🎯 What It Kills
✓ Aphids✓ Whiteflies✓ Scale✓ Thrips✓ Leafhoppers✓ Grubs✓ Soil insects✓ Mealybugs
⚙️ How It Works
Thiamethoxam is a second-generation neonicotinoid. Meridian and Flagship are the same active ingredient at the same concentration — different labels, same product. Excellent systemic activity through foliar and soil routes.
⚗️ Mixing & Application
Meridian/Flagship 25WG: 1.0–1.5 oz per 100 gallons for ornamental foliar. Soil drench: 0.07–0.14 oz per 1,000 sq ft. Do not apply to blooming plants.
Example
0.5 oz
per gallon
⚗️ Mixing Calculator
Enter your sprayer size and target rate — get the exact amount to pour. Backpack, hand sprayer, hose-end, or skid unit.
⚠️ Safety
- ⚠ Highly toxic to bees
- ⚠ Restrict applications when bees are foraging
- ⚠ Rotate with non-neonicotinoid modes of action
🐛 Pests This Treats — Learn More
Click any pest to view its full identification guide, biology, and treatment options.
🌿 Environmental & Ecological Impact
⏱️ Residual & Re-entry Timeline
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Apply
Follow label mixing and application rates
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Re-entry: 2–4 hours (until dry)
Keep people and pets out of treated area
🟢
Effective period: 4–8 weeks
Active residual — killing or repelling target pests
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Reapply
Re-treat when pest activity returns or residual expires
🔄 Alternatives & Related Products
Same chemical class or different approaches to the same pests.
🔄Imidacloprid
Same class: Neonicotinoid
🔄Same class: Neonicotinoid
Clothianidin
Same class: Neonicotinoid
🔄Same class: Neonicotinoid
Dinotefuran
Same class: Neonicotinoid
↔️Same class: Neonicotinoid
Pyrethrin
Different approach: Botanical Pyrethrin
↔️Different approach: Botanical Pyrethrin
Boric Acid
Different approach: Inorganic
Different approach: Inorganic
❓ Frequently Asked Questions
Q: Is thiamethoxam safe for pets?
Follow the product label. Keep pets out of treated areas until completely dried (2–4 hours for sprays). Once dry, treated surfaces pose minimal risk to dogs and cats.
Q: Can I use thiamethoxam indoors?
Check the specific product label — formulations vary. Baits and dusts often have indoor labeling; concentrates and granulars are typically outdoor.
Q: How long does thiamethoxam last after application?
Residual varies by formulation, surface type, weather, and UV exposure. Indoor applications last longer than outdoor. Check the product label for re-application intervals.
Q: What should I do if exposed?
Remove contaminated clothing, wash skin with soap and water. For eye contact, rinse 15–20 minutes. For ingestion or severe symptoms, call Poison Control (1-800-222-1222). Have the product label available.
📋 Safety Data Sheet (SDS)
Meridian 25 WG — Safety Data Sheet
View the official SDS document for this product directly on the CDMS label database.
📚 Sources: EPA Pesticide Labels · NPIC Pesticide Info
Published: Jan 1, 2025 · Updated: Apr 7, 2026
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Reviewed by Derek GiordanoContent reviewed by a licensed pest management professional and cross-referenced against EPA, university extension, and manufacturer technical data. Last reviewed: April 2026.