I haven't read too many consumer reviews of this product against P. Americana specifically. For reference, P. Americana is NOT the German cockroach. It is much, much bigger (1.5 to 3 inches long), red in color. Called the Palmetto Bug in the south, and the American Cockroach properly. It is nasty. I have a nest of them in a unit and am in the early stages of eradication. I've only zapped ones out in the open with D-Force. Results are so-so. On a young adult, it took a long hit right in the frontal section and top of body to get a reaction. The insect "freaked out" for long minutes before dying, running around crazily, then seizing repeatedly. About 15 minutes from spray/hit to mortality. On 2 large adults it took multiple direct hits of product to get a reaction. One "freaked out", but only after FOUR direct hits spread out over two encounters separated by 20 minutes, while the other just, eventually, dropped from the wall and rustled around in some boxes following a long blast in the face and top-front section. I am not entirely sure the second specimen died since I haven't found the body yet. Keeping in mind that this is not a "drop dead" product, I am nonetheless not terribly optimistic about its having any residual effect against P. Americana in the very weak concentration left over from spraying. We'll see. Some findings from my readings: Many populations of cockroaches have developed resistance to commonly used pyrethroids, such as the Deltamethrin used as the active ingredient in this product. The .06% concentration of Deltamethrin in these cans seems pretty weak considering the "full strength" buy-in-bulk concentration available on this site is listed at 2.5%. (Maybe I should try that instead). The latest fomulation of the commonly-available Raid Max Ant & Roach spray has Deltamethrin at .05% plus Imiprothrin (another synthetic pyrethroid insecticide) at .101%. That sounds promising, too, and it's cheaper. I'm trying it. However, I suspect that the population of P. Americana resident in this unit are perhaps somewhat resistant. In some stage of resistance perhaps; my own experience is far from conclusive. However, I am looking beyond pyrethroids for chemical solutions. Hope this helps. Keep in mind that YOUR P. Americana population may have a completely different profile vis a vis resistance/sensitivity to various insecticides. Also, my "testing" of this product is far from complete. So far, though, I can only give it three stars. Yes, it worked as designed, but only, so far, with massive application directly to the insect. The jury is out. Nice can/spray action, though. Powerful and sniper accurate at ten feet.
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