Brand: Syngenta
Demon WP Insecticide
$16.61across 1 retailer
Model: 74819
Lowest at Amazon
$16.61 at AmazonLowest at any Popular Retailer
$16.61 at AmazonPros
- •Highly effective insecticide that quickly kills a wide variety of pests including roaches (even German cockroaches), spiders (black widows included), scorpions, ants, beetles, moths, flies, and earwigs.
- •Provides lonasting protection, with results lasting up to six months or even nearly a year in some cases without bug sightings.
- •Works both indoors and outdoors, effectively treating cracks, foundations, and other typical hiding spots.
- •Maintains effectiveness even after exposure to rain or sprinklers, unlike many other sprays that lose potency when wet.
- •Easy to mix at home using the wateoluble packets, making it a cost-effective alternative to pre-mixed sprays.
- •Has hardly any strong or unpleasant odor and is generally gentle on skin, though gloves are recommended during application.
- •Only requires occasional reapplication, sometimes just once or twice a year, making maintenance relatively low effort.
- •Lonime users recommend it highly, especially in tough environments with heavy infestations like Florida.
- •Very reliable for completely clearing infestations when mixed at stronger concentrations.
- •Leaves bugs dead instantly and continues to kill for days after initial application.
Cons
- •Leaves a noticeable white or milky powdery residue after drying, which some users might find visually unappealing.
- •Needs careful handling to avoid contact with wet hands and must be kept away from food prep areas, pets, fish tanks, and children until dry.
- •For severe infestations, the initially recommended mixing ratio may not be enough; stronger mixes or more frequent applications (every other week) might be necessary.
- •Not readily available at common biox retailers like Lowe’s or Home Depot, possibly limiting accessibility for some buyers.
Bottom Line
Demon WP Insecticide is a potent, long-lasting solution for serious pest problems, especially if you’re battling hard-to-kill bugs or infestations in tricky indoor/outdoor areas. Its water-soluble packets and broad-spectrum control make it a favorite for cost-conscious users demanding dependable results. Just be prepared for the white residue and follow safety precautions during use. If you want a powerful insecticide with professional-grade endurance that’s not just surface-level, this is a solid buy. For those looking for alternatives with potentially less residue or different formulations, checking other cypermethrin-based insecticides may help, but few match this product’s combination of longevity and broad pest control.
What Reviewers Are Saying
Praised
works great63%
kills all bugs25%
easy to use13%
lasts a long time25%
impressive results13%
highly recommend25%
good for infestations13%
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