For outdoor pest control, apply dust where sunlight and weather cannot reach it to maximize persistence and UV resistance.

When targeting structural cracks, weep holes, and protected crevices use a targeted puffing technique that places a fine but visible bead of dust just inside the void without overfilling it; excess material on the outside will be blown away or broken down by sun. Choose application tools that allow metered placement such as bulb dusters with narrow tips or air-powered dusters set to low pressure so you do not compact the dust and so particles remain loosely suspended to transfer onto insects. Avoid putting dust on horizontal surfaces that receive direct sun since ultraviolet rays break down active ingredients and wind or rain dislodge particles; instead treat undersides, behind siding, under eaves, inside wall void mouths and deep in cracks where sunlight does not penetrate. For areas that are exposed or get frequent runoff apply a complementary residual formulation like granules or a microencapsulated spray designed for exterior use and labeled for the target pest to maintain control without overusing dust. Train field technicians to perform a quick light-test with a flashlight to identify penetration depth of crevices and to feel for draft paths so dust is placed where insects travel rather than where debris accumulates. Keep application rates to label recommendations and avoid layering products over one another because mixing residues can reduce longevity and cause unpredictable breakdown.

Three common mistakes shorten dust longevity and how to fix them. Applying dust on sunny or open horizontal surfaces leaves it exposed to ultraviolet breakdown and weather so move placement inward into protected voids and use complementary residuals for open areas. Packing dust tightly into gaps or using high pressure crushes particles and reduces transfer to insects so meter product with a low pressure duster and leave a loose lining rather than a dense plug. Treating without educating techs leads to inconsistent placement so implement a short checklist and hands on training that emphasizes sheltered placement, correct tools, label rates and avoiding overlap with sprays.

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