Looking at agricultural farm silos from a distance in a field


The active ingredients hydroprene, methoprene, and pyriproxyfen are mimics of insect juvenile hormones.  Applied as insecticides, these materials disrupt the processes of insect molting and reproductive development. A broad spectrum is offered and they have long-residual activity, however, they will be slow to exhibit effects and have no knockdown activity.  Insect growth regulators need to be used in a preventative or protectant mode in clean situations, or in conjunction with other insecticides if immediate control is needed. Include IGR’s with other insecticides to extend residual activity from a treatment, and for an additional insecticide mode of action to prevent development of resistance.

The active ingredients hydroprene, methoprene, and pyriproxyfen are similar in their mode of action, however chemical characteristics and product registration differences are profound.


Hydroprene is the most volatile of the IGR’s. Heavier than air, it will move deeper and sideways within the micro environment of cracks and crevices when applied as a spray. Vapor movement of hydroprene might also be an advantage when included in space treatments.

Hydroprene is degraded by sunlight so use should be limited to indoors.

Gentrol IGR bottle


Fog, spot or crack & crevice treatment, including use in food processing facilities. For control of cockroaches, stored product insects and fleas.

Item #15-155 Gentrol IGR Sold by pint (6 pints per case)
Item #15-1550 Gentrol IGR Pacs (10-1 ounce bottles per box)

Gentrol Point Source package


A device that releases Gentrol ™ vapor into small spaces. Ideal for placement within electrical boxes and small compartments.

Item #15-161 Gentrol Point Source (20 devices per box)


Highly effective at low doses. A medium rate of application has protected wheat in country elevators for 2 years in the face of heavy pressure from lesser grain borers. Labeled for direct application to all grains and seed including popcorn, sunflower seeds, and legumes as well as spices, animal feed and ingredients. Versatile Diacon products can also be used for empty bins, top dress treatments, and food processing plants. Effectively controls all stored product insects except the true weevils (sitophil=s spp., rice weevil, granary weevil, and maize weevil).  This group escapes virtually any treatment except fumigation. Insect growth regulators (IGR’s) work by disrupting the complex transformation of insects from larva to pupa, or pupa to adult. Immature insects that have sub-lethal exposures are likely to be sterile as adults. IGR’s have no knockdown activity or effects on adults present at treatment, but breaking population growth cycles achieves excellent residual control. Methoprene has been granted an exemption from tolerance in the United States in recognition of its safety characteristics. Codex tolerances are in place for exported commodities. Caution labels. Non-restricted. Virtually odorless.

Diaconx packages


The most widely used grain protectant in the US today, Diacon IGR is providing two years or more of protection against lesser grain borers and most other stored grain insects at an extremely economical cost.  In addition to its use as a grain protectant Diacon IGR can add a second mode of action and longer residual performance in tank mixes with other residuals for empty bins and a wide variety of other facility applications.  Diacon IGR can also be fogged as a space treatment in food processing facilities.  Safety characteristics of the active ingredient have earned it an exemption from the requirement for a tolerance so Diacon IGR has one of the most liberal and versatile labels on the market.

Item #15-353 Diacon IGR (4-1 gallon per case)
Item #15-355 Diacon IGR (4-1 liter bottles per case)
Item #15-356 Diacon IGR (2-2.5 gallons per case)

Diacon Dx box


Diacon-D IGR is a dry, ready to use formulation of Diacon IGR.  Diacon-D is formulated as a very fine grit with relatively low dust.  Diacon-D is most popular for on-farm applications, locations with limited water availability, and in feed manufacturing.

Item #15-360 Diacon D IGR (40 pound box)


Centynal EC is labeled for direct application to grain for protective treatments usually in combination with Diacon IGR.  Three important insects will not be controlled by Diacon IGR: Rice Weevil, Maize Weevil and Granary Weevil.  These species can all be recognized by their distinctive long weevil snouts.  Where there is weevil pressure (most serious in the South), or other species of active insects a tank mix of Centynal and Diacon IGR is the remedy.  Centynal contains a familiar long-residual synthetic pyrethroid active ingredient, deltmethrin for knockdown of active insects including weevils.  Centynal or tank mixes are also versatile for use in empty bins, and indoors or outside storage facilities.  Centynal is now an improved EC formulation for easier mixing in either water or dust control oil solutions.

Item #15-362 Centynal EC Insecticide (4-1 gallon bottles per case)

Centynal Insecticide bottle


Centynal Insecticide, with its active ingredient deltamethrin, provides broad-spectrum insect control with a long lasting residual. In addition, it features a broad use pattern that allows for application to a variety of grains and seeds, as well as use as a bin treatment or perimeter spray.

Item #15-354 Centynal Insecticide (4-1 gallon per case)

Diacon IGR Plus bottles


Diacon IGR Plus is a premix of Diacon IGR and Centynal EC.  It controls the full spectrum of grain insects including weevils and has all the versatility of Diacon IGR and Centynal tank mixes in one convenient package.

Item #15-358 Diacon IGR Plus (10-1 quart bottles per case)
Item #15-359 Diacon IGR Plus (2-2.5 gallon bottles per case)


Pyriproxyfen is non-volatile and stable in sunlight.

Nyguard IGRx bottles


Nyguard features the broadest label among the IGR’s including uses both indoors and outdoors. This versatile product can assist in the management of pests as diverse as stored product pests, cockroaches, flies, and mosquito larvae.

Item #15-2256 Nyguard IGR Sold by the 140 ML bottle (10 bottles per case)


Dia Toplesser Dust Applicator


Ideal for top dressing Diacon IGR D or Diacon Diatomaceous Earth. Compute area of grain surface to determine product needs.
(Apply Diacon IGR D @ 8 oz per 1000 sq ft) Heaping scoop = 1.5 lbs of Diacon IGR D. Load pail with appropriate quantity for grain surface. Applicator is powered by your compressed air system. Top dress elevator bins in a matter of seconds from the top hatch without entering bin.

Item #61-2986 Top Dresser Dust Application Kit with Bucket, Scoop and Applicator