⚖️ 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
Precor IGR — Zoëcon — professional flea/mosquito IGR
Altosid Briquets — Zoëcon — mosquito larval control
Nyguard Plus — MGK — professional broad-spectrum IGR
Martin's IGR — consumer generic methoprene
🎯 What It Kills
✓ Fleas (prevents egg hatch)✓ Mosquito larvae✓ Stored product insects✓ Clothes moths✓ Fungus Gnats
⚙️ How It Works
Methoprene is an insect growth regulator (IGR) — it mimics juvenile hormone preventing insects from maturing to reproductive adults. Does not kill adults but breaks the breeding cycle. Must be combined with adulticide for complete flea control.
⚗️ Mixing & Application
Precor IGR: 0.5–1 oz per gallon for indoor carpet/floor treatment. For outdoor flea treatment: 0.5 oz per gallon. Altosid Briquets for mosquitoes: 1 briquet per 100 sq ft of water.
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
- ⚠ Not an adulticide — must combine with a kill product for adult fleas
- ⚠ Very low mammalian toxicity — one of the safest pesticide classes
- ⚠ Do not apply to water bodies without checking local regulations for mosquito use
🐛 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
🔹
Apply
Follow label mixing and application rates
🔸
Re-entry: 2–4 hours
Keep people and pets out of treated area
🟢
Effective period: 120–150 days
Active residual — killing or repelling target pests
🔄
Reapply
Re-treat when pest activity returns or residual expires
🔄 Alternatives & Related Products
Same chemical class or different approaches to the same pests.
🔄Pyriproxyfen
Same class: IGR
↔️Same class: IGR
Pyrethrin
Different approach: Botanical Pyrethrin
↔️Different approach: Botanical Pyrethrin
Boric Acid
Different approach: Inorganic
Different approach: Inorganic
❓ Frequently Asked Questions
Q: Is methoprene 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 methoprene 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 methoprene 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)
Altosid — 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.