Following the suggestion here, I did a little searching and found two options for bug spray: an off the shelf product or DIY. In terms of per ounce active ingredients, the off the shelf solution is about ~10 times more expensive. I'm wondering if I go the DIY route, are there any additives I should add to increase the retention/longevity of the active ingredients in the perimeter barrier, like surfactants and ammonium sulfate for glyphosate?

  • How long are you targeting between applications? When I used Bifen as a barrier, I had excellent results with a 4 month schedule in a wet and sunny environment. For longer than that, you could try fipronil as a barrier. May 25 '21 at 13:19
  • Certainly the longer the better (hence the question) :) But 4 month sounds long enough! Was that just Bifen without any adjuvants?
    – Roc W.
    May 25 '21 at 15:58
  • Yes, in fact that identical product if I recall correctly. It may depend on the pests in question, which were cockroaches in my situation. I also recall that I used one of the richer mixture ratios as specified on the label, which may have contributed to the longevity. This did make the dried product have a faintly milky residue, but this was a non-issue for an outdoor perimeter spray. May 25 '21 at 21:03

With credits to reddit, there are a few adjuvants to mix with Bifen:

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.