Review: RoachKill

Remember my last venture with pesticides? Well, a new batch of German cockroaches has arrived in my house, and Mortein couldn’t stop them all – in fact, I think its effectiveness has gone down with time. So I tried out other methods, all without success: borax (didn’t really work – cockroaches seemed to avoid it) and Chinese poison (same case).

So when I came across RoachKill in a local supermarket, I thought: might as well. Sold at $7-8, RoachKill is a gel bait that comes in a syringe packaging. The active ingredient is Imidacloprid, an insect neurotoxin which I later found to be dangerous for bees – more on that later.

It works in a similar way as the Mortein baits: attracting cockroaches to eat it, and then killing them. The instruction prescribes one to three spots the size of a small pea per every meter square, in places where roaches congregate such as under the sinks, around door hinges, behind the dishwashers and more.

I found it quite easy to apply, although it’s very easy to go overboard – so just press on the plungers softly. The gel is white and, as advertised, odourless.

It worked. It did a great job in killing the roaches. The night after a fresh batch of application, there were three to five cockroaches lying on their backs on the floor and by the window. More dead roaches surfaced in the first week, and after that, the house was relatively free of the pest. If they reappeared, I would apply more RoachKill in several spots. Sometimes I could see the roaches convulse before falling to their deaths.

Effectiveness is less of an issue than the environmental impacts. Imidacloprid has been linked to bird and bee deaths due to its nicotine-like effects on the nervous system of these animals. Other than that, imidacloprid has largely been declared safe for human – but it is indeed not the most environmentally friendly insecticide. Personally, I would buy it again – the cockroach infestation in my area is just too much, unfortunately.


  • Most effective among all DIY pesticides
  • Very affordable
  • Non-invasive – doesn’t smell or take up space


  • Not environmentally-friendly
  • A bit difficult to find – only available in select stores

Rating: 4.5/5 Stars

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