Darlex Insecticide

Darlex Insecticide

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Product Overview

Darlex Insecticide is a made for the poultry industry to control both adult and larvae darkling beetles (also known as lesser mealworms) and hide beetles, crickets, and ants. It contains the active ingredient, Clothianidin, that has proven lasting control of beetles. Darlex is easy to mix and spray and can be used as a broadcast, crack and crevice, banded, spot, void and drench treatment. May be use in areas of indoor poultry housing of broiler, turkey, caged egg layer, and breeder. This insecticide is also for use in the exterior perimeter of poultry housing, foundation, doors, vents, eaves and utility penetrations. Darlex insecticide covers 1,000 sq. ft. per 4 fluid ounces.

Features and Specs

Active Ingredient Clothianidin 23%
Target pests Darkling and Hide Beetles, Crickets and Ants
For use in Commercial: Indoor & Outdoor Perimeter of Poultry Houses
Application Broadcast treatment, banded treatment, crack and crevice treatment, spot treatment, void treatment, and drench treatment

When to Apply: Apply after de-caking, clean-out and sanitation procedures are complete, but prior to new flock placement
Where to Apply: Whole house treatment or banded applications 3–5 feet wide under all water and feed lines, along inside perimeter and footings, and 1–2 feet up wall support beams/posts. It’s important to accurately measure all surface area to be treated.
Pet safe Yes, if used as directed on Label
Formulation Professional Product
AZ, MA, MD, ME, NJ, VT (Restricted To Licensed Applicators Only)
Coverage Area 4 fluid ounces of Darlex Insecticide per 1,000 sq. ft.
Shipping Weight 9.64 lbs
Manufacturer MGK
UPC 848920000676
EPA Registration 1021-2771



  • Do not apply this product in any 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 regulation.
  • Poultry producers should use a range of management practices to reduce the possibility of insecticide resistance and to help minimize the buildup and carryover of populations of darkling beetles and other listed insect pests. Contact your local Cooperative Extension office for advice concerning the use of this product and appropriate resistance management strategies.

  • Shake well before using.

  • Darlex Insecticide controls darkling beetles (also known as lesser mealworms) and hide beetles in poultry housing. This product can be used as a crack and crevice, general surface, or spot treatment applied to walls, floors and support beams of poultry (broiler, turkey, caged egg layer, breeder) housing.
  • Do not apply when birds are present and do not expose poultry to direct spray. Exposed water lines and feed troughs must be covered or removed from the area before treatment begins. Once completed, allow surfaces to dry completely before restocking. Do not apply as a fog or space spray. Fresh bedding material must be put into the house prior to restocking.

  • Read and follow ALL label directions when applying this product.

  • Do not use Darlex Insecticide at less than the label rate. By using less than the specified rate, insects are exposed to sub-lethal doses, which may not kill the insect, but can increase the development of resistance.

When To Apply

Apply after de-caking, clean-out and sanitation procedures are complete, but prior to new flock placement. It may be advisable to treat houses before removing litter to prevent possible infestation of nearby residences.

Mixing Instructions

Mix 4 ounces in ½–2 gallons of water to treat 1,000 sq. ft. Be sure to accurately measure the actual surface area to be treated in order to determine the quantity of Darlex Insecticide required for the application. To prepare the diluted spray, fill the sprayer tank with half the total water to be used, add the appropriate amount of Darlex Insecticide, then add the remaining water while agitating or mixing.


Sq. ft. of Area to be treated Fluid ounces of Darlex Insecticide Needed Total Volume of Water
500 2 fl. oz. ¼ – 1 gallon
5,000 20 fl. oz. 2.5 – 10 gallons
10,000 40 fl. oz. 5 – 20 gallons
15,000 60 fl. oz. 7.5 – 30 gallons
20,000 80 fl. oz. 10 – 40 gallons

Make certain that sufficient agitation is maintained throughout the application to ensure a uniform spray. Prepare a fresh spray mixture before each treatment.

NOTE: Adding disinfectants to insecticide tank mixes may affect insecticidal activity.


Brand Application:

Darkling beetles often crowd under feeders, water lines or along perimeter walls, lying buried in the litter. Under these circumstances, it may be sufficient to treat the primary areas of beetle infestation within a poultry (broiler, turkey, caged egg layer, breeder) house. Beetles can also infest structures behind insulation in walls; Darlex Insecticide can be applied as a spot treatment inside wall voids or as a crack and crevice application to target these infestations.

For band application, apply diluted product to a 3–5 foot wide swath of floor area, making sure to get under all the water and/or feed lines in the house. Continue applying a 3–5 foot swath along the inside perimeter of the side and end walls, including the entire surface of all footings and 1–2 feet up onto the walls, support beams and wood surfaces above the foundation.

Interior Broadcast Application:

Whenever an infestation is severe, it may be necessary to treat the entire house by applying the diluted product as a broadcast spray. Spray Darlex Insecticide on the entire floor, paying particular attention to areas beneath feed and water lines, as well as to the lower sections of walls up to 1 foot on wood surfaces above the foundation. Fresh bedding must be put into the house prior to restocking.

For Best Results:

In houses with support beams, treat around the base of each support post and 1 foot up each post. Apply diluted spray to cracks and crevices around insulation where beetles have been seen or can find harborage. To prevent movement of beetle infestations to houses and nearby residences, it may also be desirable to treat manure before it is relocated from the poultry house.

Use Darlex Insecticide as part of an integrated pest management program to extend the efficacy of insect control products and to help minimize the buildup and carryover of resistant insect populations. Darkling beetles have the ability to develop resistance to insecticides. When one class of chemistry is used year after year, the likelihood that insects will develop resistance and become more difficult to control, greatly increases. This product contains clothianidin, a neonicotinoid insecticide which should be used in an insecticide rotation program with other classes of insecticides, such as pyrethroids, organophosphates or spinosyns, to minimize or prevent the development of resistance and to maintain its effectiveness in controlling darkling beetles and other listed insects.

In order to avoid re-infestation after cleanout, apply targeted applications to the exterior of the building perimeter, foundation, doors and windows, and other places where pests may enter the building. Do not allow this product to contact plants in bloom if bees are foraging the treatment area.

Darlex Insecticide may be used to control crickets and nuisance ants in, and along the outside perimeter of animal housing. Mix ½–1 ounce of Darlex Insecticide per gallon of water. Apply as a spot treatment, banded application or crack and crevice application at the base of the structure foundation or at entry points such as doors, vents, eaves or utility penetrations. In building interiors, apply only as a crack and crevice or void application. If desired, spot or drench treatments may be made to soil around the structure exterior where ants nest. Above ground ant nests in wood posts, decks, or fences, may be treated by spraying the cavity where ants are nesting or the wood surface.

Not for use in control of red imported fire ants, native fire ants, pharaoh ants, harvester ants or carpenter ants.

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