Onslaught FastCap Spider & Scorpion Insecticide


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Need to get rid of spiders or scorpions? Onslaught FastCap Microencapsulated Insecticide is one of our favorites when it comes to spider and scorpion control! Why? Onslaught provides fast-acting and long-lasting residual control, which means it will hold up very well in all temperatures. Spiders, scorpions, fleas, mosquitoes and a broad spectrum of other residential and commercial pests don’t stand a chance.  Shop all Spider Products Here.

Features and Benefits:

  • Kills mosquitoes, including the Aedes mosquito that may carry and transmit Zika virus
  • Quick kill
  • Combines active ingredients Esfenvalerate, knockdown agent Prallethrin with synergist Piperonyl Butoxide (PBO) for enhanced control
  • For use indoors and outdoors, including indoor broadcast treatment option
  • For use in food and non-food areas of commercial structures
  • For use in and around livestock facilities, on turf, ornamentals and landscapes
  • Kills a broad spectrum of pests (including spiders, scorpions, fleas and mosquitoes)


  • 16 oz.
  • Case of 6 (16 oz.) Bottles
  • 128 oz. – Gallon


Product Alternatives: Zenprox ECOne Guard Multi MoA
EPA Registration No. – 1021-2574
Active Ingredient: Esfenvalerate  – 6.4%, Prallethrin  – 1.6%, Piperonyl Butoxide  – 8%
Mixing Instructions: SHAKE WELL.

Mix Onslaught FastCap Spider & Scorpion Insecticide with water and apply with hand pressurized or power operated sprayers. Agitate container of Onslaught FastCap Spider & Scorpion Insecticide before diluting by inverting it several times. Clean spray equipment before and after use. For dilution, add approximately half the required water to spray tank and then add the appropriate amount of Onslaught FastCap Spider & Scorpion Insecticide. Agitate, and slowly add the remaining water. Agitate spray thoroughly before using and also occasionally during use to ensure dispersion. If spray filter screens are used, they should be 50 mesh or larger. Use 0.5 fl. oz. of Onslaught FastCap Spider & Scorpion Insecticide in 1 gallon of water for light infestations or as a maintenance control rate. Use 1.0 fl. oz. per gallon of water for heavy infestations or as an initial clean out rate. Apply two-second bursts of spray per square foot of area being treated. Do not apply excessively; dampen surface but not to the point of saturation or runoff. Only dilute Onslaught FastCap Spider & Scorpion Insecticide with water

Indoor Application Rates:
Pests Dilution Rate in Water Application Rate of Mixed Solution Application Methods

Spiders and Other Listed Crawling Insects

Light Infestation

Heavy Infestation


0.5 fl. oz./Gallon

1.0 fl. oz./Gallon

1 Gallon/1,000 sq. ft.


   Apply as a coarse, wet spray

  • Broadcast Surface Spray
  • Crack and Crevice Treatment
  • Spot Treatment
  • Injected Into Wall Voids

Listed Flying Insects

0.5 fl. oz./Gallon

1 Gallon/1,000 sq. ft.

      See Above

Scorpions and Other Listed Stinging Insects

1.0 fl. oz./Gallon

1 Gallon/1,000 sq. ft.

      See Above

See Label for Outdoor Application Rates.
  •  Remove pets and birds and cover fish aquariums before spraying.
  •  Do not apply this product in patient rooms or in any rooms while occupied by the elderly or infirm.
  •  Do not apply to classrooms while in use.
  •  Do not apply in institutions (including libraries, schools, sports facilities, etc.) in the immediate area where occupants are present.
  •  Do not apply as a space spray in residential sites.
  •  DO NOT use this product as a fogger or apply it as a space spray.
  •  Use only in areas described.
  •  Remove pets and cover fish aquariums and pet’s food and water dishes before spraying.
  •  Keep all people (especially children) and pets out of areas being treated and restrict access to these areas until all surfaces are dry

Additional information


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