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Onslaught FastCap Brown Recluse Spider and Scorpion Insecticide

8 reviews
Usually Ships in 1-2 days
Use Onslaught FastCap spider and scorpion insecticide for maximum results when fighting troublesome pests. It works quickly to treat many different pest insects indoors and outdoors and can be used in food areas such as processing plants. This insecticide contains a few active ingredients for effective control over resistant pests and is easy to apply with a direct sprayer or with injector application equipment.

Features and Specifications

Active Ingredient(s) Esfenvalerate - 6.4% Prallethrin - 1.6% Piperonyl butoxide - 8%
Pest Control Kills Ants, Asian Lady Beetles, Bed Bugs, Boxelder Bugs, Carpenter Ants, Cockroaches, Confused Flour Beetles, Darkling Beetles (lesser mealworm), Face Flies, Fleas, Fruit Flies, Horn Flies, Hornets, House Flies, Indian Meal Moths, Lesser Grain Borers, Mosquitoes, Red Flour Beetles, Rice Weevils, Saw-tooth Grain Beetles, Scorpions, Small Flying Moths, Spiders, Stink Bugs, Swarming Termites, Ticks, Wasps, Yellow Jackets
Sale Prohibited CT, VT
Shipping Rate Free
UPC 848920000492
EPA Registration 1021-2574

How Onslaught FastCap Insecticide Works

Onslaught FastCap Brown Recluse Spider and Scorpion Insecticide contains two primary pyrethroids: prallethrin and esfenvalerate. These pyrethroids disrupt an insect's nervous system, weakening it significantly and causing death. Onslaught also contains an effective synergist known as piperonyl butoxide, which enhances the pyrethroids and makes them even more potent. This fast-acting insecticide quickly knocks down the target pests and provides residual control when it's applied as an indoor broadcast treatment or an outdoor spray.

Where to Use Onslaught FastCap Brown Recluse Spider and Scorpion Insecticide

Onslaught FastCap brown recluse spider and scorpion insecticide is labeled for commercial and residential use both indoors and outdoors. It keeps pest infestations from taking over garages and attics and prevents unwanted nests and webbing in office buildings, hotels and restaurants. Use it to treat the pests' hiding areas such as beneath appliances, around plumbing pipes and inside cabinets. It can be used in conjunction with an integrated pest management program alongside pyrethrin-based foggers. However, never apply Onslaught as a fog or a space spray in the target areas.

Target Pests

Onslaught FastCap Insecticide may be labeled as a spider and scorpion insecticide, but it targets more than these two pests. In fact, it works on numerous crawling and flying insects inside homes and businesses and outside on lawns and landscapes. It works quickly to kill ants, fleas and ticks and knocks down wasps, mosquitoes and yellow jackets. Spray this insecticide on turf to kill ant and flea infestations, and apply it in crawlspaces to keep spider populations under control. Use Onslaught FastCap insecticide to kill and to control the following pest insects and more:

  • Bedbugs
  • Carpenter ants
  • Gnats
  • Houseflies
  • Pantry pests
  • Stinkbugs
  • Ticks
  • Brown Recluse Spider
  • Scorpions


Reasons to Use Onslaught FastCap Brown Recluse Spider and Scorpion Insecticide

  • Provides effective pest control indoors and outdoors
  • Works well in an IPM program with other pesticides
  • Contains two pyrethroids for faster and greater results
  • Targets spiders, scorpions and common insect pests
  • Perfect for spot, crack, crevice and surface treatments


Onslaught FastCap Insecticide Provides Maximum Results

Onslaught FastCap Insecticide does more than target and kill spiders and scorpions. It also kills numerous indoor and outdoor pests such as fruit flies, ticks, fleas and mosquitoes. This insecticide contains multiple ingredients for faster knockdown and residual control of pest infestations in homes and businesses. It's ideal for use as a spot treatment to target individual insects and their nests, as well as a crack and crevice treatment for pests that are inside hard-to-reach areas.


It is a violation of Federal law to use this product in a manner inconsistent with its labeling. Do not apply this product in a way that will contact workers or other persons, either directly or through drift. Only protected handlers may be in the area during application. For any requirements specific to your State or Tribe, consult the agency responsible for pesticide regulations.


For additional information on this product please reference the CDMS label database listed below



Ask a Question
  • Is this product Onslaught safe to use outside where dogs may go after it is dry?

    Once it is dry it is safe for people and pets

Customer Reviews
4.8 Based on 8 Reviews
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Filter Reviews:
    United States
    I recommend this product

    Spider repellent

    I truly haven't found whether or not it works but I don't think I would like to pay the price for it again until I find out if works.

    United States United States
    I recommend this product

    Onslaught Fastcap

    Tastes great! Controls AZ scorpions. Best results, alternate monthly applications with Cy-Kick CS.

    United States United States
    I recommend this product

    Fast Cap Spider/Scorpion Spray

    Product is excellent! I have use this product now for over two years and it does an excellent job on roaches, ants, creepy crawlers of all types, Spiders,etc…have not seen anything that this product does not ****…I sprayed the first ever application for high infestation just to see how it would work, then each time after I sprayed for mild infestation and it now controls all the issues that I have. I combine this along side Bifen granules on the outside exterior of my home with a hand held fertilizer battery operated spreader and bugs are nonexistent…Superior product! You will not be disappointed!

    Art G.
    United States United States
    I recommend this product

    Fast Cap

    Actually just made the 1st application so it’s a little premature.

    joseph s.
    United States United States
    I recommend this product

    Best stuff I've ever used.keeps my house critter free for about a year and a half

    russ k.
    United States United States
    I recommend this product

    Best product

    I have been battling scorpions since moving to Arizona 2 years ago. This is the best product at the best price I have found. Not cheap, but it has worked well for me. It can take up to a few days to **** them, so I apply around the house and then create a" ring of protection" further away from the house along fence and retaining walls and rocky areas...anywhere they like to hide.