? asked in Home & GardenOther - Home & Garden · 8 years ago

Exterminator sprayed a month ago. Still roaches. Can I put down traps and boric acid?

So I'm subletting an apt in West Los Angeles (I see in many roach questions they ask location) and I'm on my last month. Since last month we've started seeing roaches. They don't seem to go for the food... I've seen them in my room, the kitchen floor, living room, but never on or near food, strange (All my food is in tupperware anyway, not taking chances)

So it wasn't a bad infestation, it could be anywhere from waking up in the morning to find 2 - 3 roaches scatter, or at night lifting a thing like my suitcase and one runs out from under it. And it could also be totally scarce for like a week. Each night I'd come home and go through the routine of checking places. What's also weird is they'd never be upstairs. Only the bottom floor.

It's a clean, big, mostly hardwood floor apt, and when I told the landlord about it he said they're waterbugs that come in from the rain. When they kept showing up though he got us an exterminator, who put down residual insecticide (I think) (It required us to put all of our stuff in a pile).

After that all I've been finding are dead roaches and roaches on their backs. I called the exterminator and he said this was normal because the spray numbs them or something so they can't walk right and they should be gone in a few days or weeks, and not to use additional measures.

Well it's been a month and though we had about 2 weeks of nothing, I'm starting to find 2 - 3 big ones dead or dying on their backs every day or two. They are about the size of my thumb, and...hmm I'll take a pic for you but I believe it's the American Roach. It's big, reddish and blackish


Also, I've sealed every crack in the wall / floorboard I could find with tape. If there's thousands in the walls I don't see how they could get out...

My roommates don't want to talk to the landlord again (and it's a joint effort or nothing) to get the exterminator back, so we're going to put down boric acid (also possibly salt, I've heard this works) and traps and hope they're gone.

Has it been enough time since the exterminator sprayed to do that without erasing what he did? Is that whole "erasing what they did" thing a ploy to get them to keep coming back in the first place?

Also how exactly can I kill these things? I know not to crush them because of the whole eggs spreading thing, and right now I'm pretty content on my method of putting them in a cup, filling the cup with water (but they dont drown. THEY NEVER DROWN), and adding dish soap, then they seem to die instantly, then flushing them.

Oh sorry one more thing. This is my 2nd apt out of many future ones in SoCal I've had roaches. The 1st one I believe was German or Oriental, small, black, fast.) And that was much much worse. We had em coming out of plugs and stuff, but that place was dirty, so it fit..... It's possible I might be carrying them (even though I've never seen a roach in my life until I lived here). How do I prevent taking these roaches to my next apt?


TLDR; American Roaches in apt. Sprayed about a month ago. Can't get exterminator. Can we treat it ourselves?


I have sealed up all spaces under the bathroom sink that had holes with tape. We still have vents though, 3 in the living room, 1 in my room and the bathroom and the kitchen. I can't imagine how to seal those without it looking like a disaster zone, so I'm going to believe they're not coming from there.

3 Answers

  • Lar
    Lv 7
    8 years ago
    Best Answer

    this type of roach is not the one where "you see one there must be thousands in the wall"...it is an outdoor insect coming in, like a cricket. Since they seem to be effected by the spray the problem is they are coming in from somewhere...hopefully the exterminator treated along the outside of the building to stop them or under it if there is a crawl space... the immature ones will have visible bands across their backs since (adults have wings that hide the bands)...if you are finding many immature ones I would worry of a water leak they are coming from...also if you have a drain that is not being used, when the water evaporates out of the trap they can be coming from the sewer line. if you are finding that many you may want to call the exterminator back (as long as there is still a warranty) and have him treat the entry points with a good residual and look around for problems

    Source(s): If you choose to do it yourself the baits will not work well for them and I would stay away from putting boric acid all over the home...go with something like Ortho Home Max. This uses Bifenthrin, which many pest companies use as their main product...treat windows, exterior door jams, plumbing wall penetrations such as under sink, behind toilet ans washing machine / hot water heater.
  • vegajr
    Lv 4
    3 years ago

    Roaches After Exterminator

  • 8 years ago

    The big roaches come in from outside. They need moisture to live and do not live long. And they do not produce inside.

    Sealing up the places around the pipes under the sinks will keep them from coming in there.

    Some weather striping under the door will stop them there.

    They can crawl through fans in the bathroom.

    The traps and boric acid will work.

    Source(s): Big roaches come in through the bathroom fan that is on the ceiling in our bathroom.
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