If you have discovered some signs of the dreaded roaches in your home, you need get rid of them fast! But how do you find the best roach killer? There seem to be loads of options out there. All of them sound great, but what will actually work for your problem? Where do you start? Well, firstly you need to look at your own particular situation and see what would work best for you. Factors to weigh include how fast the roaches will die after exposure, and whether or not the chosen method will target the entire population. In other words, how fast does it work and how far does it reach? These two factors will be explored below; helping you the answers you need to find the best solution for your predicament.

The following six methods of eradicating roaches will be discussed and weighed up in view of the two factors mentioned above.

Poison Baits and Gels

Baits and gels attract the cockroaches to nibble on them and then the roaches become lethally infected and their days are numbered. Of all the wide variety of roach baits and gels available undoubtedly the best roach killer is Advion Syngenta Cockroach Gel Bait. It is very easy to use as it comes in a tube with an applicator nozzle and all you need to do is place small blobs of gel along the edges of the infected areas.

As you probably know by now, roaches do not die easily, but in the case of gel baits, this definitely works to your advantage. After the roach has taken a nibble of the deadly gel, it will not feel the effects immediately, but will scurry back to its den or harbourage area where all the rest of the gang congregate. It could take days for the roach to die, but there’s a good chance it will die where the rest of the gang is hiding out—which in the case of poisoned baits, is a good thing.

With Advion Syngenta Cockroach Gel Bait, one affected cockroach can be used as a weapon to kill many others. One can contaminate many through contact and through the feces (as well as cannibalism). And when the roach soon dies, the other roaches will feed on its body and so the poison continues to spread. This chain effect is what makes roach baits so effective against the entire population.

Adhesive Glue Traps

The way adhesive, or sticky glue traps work is that the roach gets stuck and then it cannot free itself. It may struggle and squirm for a while before succumbing to its fate.

This is probably one of the fastest methods of getting cockroaches. They don’t die immediately after getting stuck, but they’re not likely going to be able to escape. They’ll struggle for a while before dying.

Although it is great to see the dead roaches on your sticky glue trap, the drawback is that what you see is what you get. You may have caught dozens of them with sticky traps, but all the unseen masses of roaches still hiding behind the scenes remain safe. With such a huge drawback, you should never use sticky traps alone. Sticky traps aren’t exactly useless though. They can be good as a backup, or monitoring method for you to gauge the roach population.

Pesticide Sprays

spraying one of best roach killersPoison, or chemical sprays can be ver effective at killing cockroaches on contact; either sprayed directly on the roach, or when the roach comes in contact with an area that you have sprayed. When it comes to pesticide sprays, the best cockroach killer is Demon WP Insecticide. This has the concentrated active ingredient cypermethrin and it is what the professionals use. It comes in powder form which you dilute with water and then apply it with a gallon pump sprayer.

Demon WP attacks the central nervous system of the roach as soon as it comes in contact with it or ingests it, leading to death in a short space of time. In terms of killing speed, Demon WP is second only to a good smash with the shoe. In other words, it’s safe to say that it’s the fastest chemical solution. The great thing about this spray is that it is not only effective against roaches, but also kills a range of other pests and bugs.

The spray is great for applying in cracks and crevices, and anywhere that the roaches may be hiding. It is also great for creating a chemical barrier that will kill most roaches who dares to cross the line. It is often sprayed outdoors along the walls to create such a barrier. Once it dries, Demon WP can continue to kill roaches for up to three months, but it is good to reapply the spray at least once every couple of weeks. If you’re using it outside, you’ll also want to spray again after it rains to maintain your barrier.

The only drawback to pesticide sprays such as Demon WP only affects the roaches that makes direct contact with it. Unless a cockroach was directly sprayed with the pesticide, there is no chain effect from cannibalism. Even if it was directly sprayed, many times, they do not make it back to the nest. So the best way to use sprays is to spray surfaces of known high traffic areas and to create a barrier.

You will also want to avoid using a pesticide spray if you are planning to use baits, or boric acid (below). Using a fast acting contact killer like Demon WP will make baits and boric acid useless because it will often kill a cockroach before it makes it back to the nest (defeating the whole purpose of using the slow acting bait and boric acid).

Boric Acid

Another favourite, and effective cockroach killer is boric acid. This can be used in powder form and dusted over surfaces, or mixed with syrup and flour to form a paste, or homemade bait balls.

It would take approximately seventy-two hours for an adult roach to die after it has come into contact with boric acid. Younger roaches which are nymphs or juveniles would usually die sooner within about twenty-four to forty-eight hours.

After the roach has touched or ingested the boric acid it will return to the nesting area where it will infect the others. Boric acid damages the exoskeleton of the roach and causes dehydration and certain death, not only for the one initially infected, but also for all the roaches that subsequently come in contact with it, making it one of the best roach killers to use.

Insect Growth Regulators (IGRs)

IGR’s do not kill roaches outright. They prevent juvenile cockroaches and larvae from becoming mature and then they are unable to reproduce. IGR’s can also prevent the cockroach eggs from hatching.

IGR’s effectively prevent the roach population from growing, so over a period of time the population can die out; slowly, but surely. It’s not recommended to use IGRs as your sole method of extermination though (read below for why).

Using IGRs alone is not only slow, it may be entirely ineffective by itself. There’s bound to be some eggs and some juveniles who is able to stay safe from the growth regulators; giving them a chance to reproduce. By itself, it’s slow, potentially ineffective, and not recommended. However, when used in combination with one of the other methods listed above, results skyrocket. So use it, but combine it with one of the other methods.


If you have exhausted all the recommended methods, then call in the professionals. There’s no need to keep on struggling with these pests by yourself. How fast this will work depends on the analysis made, and the method used by the exterminator. Just bear in mind that the professionals also use some of the products described above. The difference is their experience and more thorough knowledge.

Now that you know the ins and outs of a selection of roach eradication methods, you are ready to choose. Select the one that will work best in your situation. The best roach killer is the one that gets rid of all the cockroaches (seen and unseen). It also keeps them away for good. And remember, the quickest is not always the best – slow and steady sometimes get the job done better. Consider which of these might work best for you and stick to it. They all work, so stick to it and you’ll see results.