This is how we defeated the invincible bedbug. This is cheap and easy. You can make your own insecticide dust by mixing in a little pesticide. I used propoxur because it has a residual effect lasting up to a month. Pyrethrin type insecticides break down in air in a couple of days. If that is all you have use it, however you don’t need the insecticide THE SILICA GEL POWDER WORKS ALL BY ITSELF. If you want to test silica gel then find a small packet of silica gel desiccant that is commonly packed with lots of products to absorb moisture. Crush up the beads in the packet to a fine powder and put it in a container along with a couple of bedbugs. The powder will stick to the bedbugs and will dehydrate them. They will be dead in a couple of hours. The silica gel in the packet of dessicant is the same as the silica gel cat litter.(Kills cockroaches too) The silica gel cat litter is fairly soft and easy to crush to a powder. Make it softer by soaking it in water. As you crush it the water will evaporate. You can also use cement powder, aquarium diatom filter powder(Vortex or any brand). All the bedbugs in our house are dead but I had wanted to try tile grouts and plaster powders and even powdered sand or anything that will dry out bedbugs. The key substance for killing bedbugs is fine silicon dioxide powder. You guys experiment and let me know your results. Bedbugs are cannot become resistant to these powders that dry them out, get in their joints and wear holes in their …
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