How Long Does it Take for a Large Flying Cockroach to Die?

Flying cockroaches are one of the most feared insects. They are large, they fly, and they are hard to kill. The average life span of a large flying cockroach is about 160-180 days. When sprayed with a pesticide, it’s a different story. When sprayed directly with a powerful insecticide, a flying cockroach will die within minutes, if not seconds. If only it were that easy to get rid of them for good!

However, it’s worth noting that there are different factors affecting the time it takes for an insecticide to kill a cockroach. The type of insecticide, the size of the cockroach, and even the temperature can all play a role.

Large flying cockroaches, as opposed to small ones, have a thicker exoskeleton which makes them more resistant to pesticides. This means that it might take a little longer for the insecticide to penetrate their system and reach their vital organs.

cockroach dead on wooden table

Factors Affecting How Long it Takes for an Insecticide to Kill a Cockroach

Different situations will result in different times it takes for an insecticide to kill a cockroach. Here are some things that can affect how long it takes for an insecticide to kill a cockroach:

Type of Insecticide/Pesticide

The type of insecticide you’re using will make a difference in how long it takes to kill the cockroach. Some insecticides are designed to work quickly, while others might take a little longer. For example, pyrethrin-based insecticides are designed to work quickly and are effective against most cockroaches.

On average, it takes about two minutes for a cockroach to die after being sprayed with pyrethrin. On the other hand, if you’ve used a natural or DIY cockroach killer such as boric acid, it might take a little longer.

Boric acid is a slow-acting poison that takes time to work. It can take up to two weeks for a cockroach to die after coming into contact with this substance.

Size of Cockroach

The size of the cockroach also affects how long it will take for the insecticide to work. Smaller cockroaches will generally die quicker than larger ones. This is because they have a smaller body mass and less exoskeleton for the insecticide to penetrate. Smaller cockroaches typically die within seconds of being sprayed.

Larger cockroaches, on the other hand, have a thicker exoskeleton which makes them more resistant to pesticides. It might take a little longer for the insecticide to reach their vital organs. A large flying cockroach may take approximately two minutes to die after being sprayed.


Insecticides also work differently in different temperatures. In cold weather, it might take an insecticide a little longer to work because the cockroaches are less active. In general, higher temperatures will speed up the process while lower temperatures will slow it down.

This is because most insecticides are designed to work best in warm weather. In cooler weather, the cockroaches might not be as active and it might take longer for the insecticide to work.

During summer or hotter temperatures, it might only take a minute or two for a cockroach to die after being sprayed. In cooler weather, it could take up to five minutes.

The Species

Did you know that there are over 4000 different species of cockroaches? That’s a lot of different types of cockroaches! Each species is slightly different and some are more resistant to insecticides than others. For example, the German cockroach is one of the most common types of cockroaches in the world.

On the other hand, the Oriental cockroach is one of the easiest types of cockroaches to kill. This is because they’re more susceptible to insecticides and don’t have the same level of resistance.

The German cockroach, one of the most common types of cockroaches, can take up to five minutes to die after being sprayed with an insecticide. The Oriental cockroach, on the other hand, typically dies within seconds.

When Using Diatomaceous Earth

diatomaceous earth

Over the years, different natural substances and natural cockroach killing methods have become popular. One of these is diatomaceous earth. Diatomaceous earth is a white powder made from the fossilized remains of algae. This substance works by puncturing the exoskeleton of the cockroach and causing it to dehydrate and die.

Diatomaceous earth is a relatively slow-acting poison, so it might take a few days for the cockroach to die. In most cases, it will take between two and four days for a cockroach to die after coming into contact with this substance.

The Distance the Insecticide Has Been Sprayed

Flying cockroaches can travel long distances, so it’s important to spray them directly. If the insecticide is sprayed from a distance, the cockroach might not be exposed to enough of it to kill them. In general, it’s best to spray the cockroach until it is saturated with the insecticide.

When sprayed directly, expect the flying cockroach to die almost instantly. Cockroaches that have been sprayed with an insecticide and are dying will usually start to twitch or convulse. This is because the poison is affecting their nervous system. In some cases, they might even fall on their back and kick their legs in the air.

On the other hand, when sprayed within a couple of inches away, their chances of surviving are significantly higher. If you’re lucky, the cockroach may start to feel the effects of the poison within a few minutes, but it could take up to an hour for them to die.

Insecticides applied to the ground will also kill cockroaches, but it takes longer for them to die. This is usually because they don’t come into contact with as much of the insecticide. This means that the fumes on the ground would have to slowly get into the cockroach’s system and kill them.

This process may take days – and unfortunately, some cockroaches survive this kind of method. The only thing they have to do is stay away from the walls or areas where the insecticide has been sprayed, and they’ll be able to scurry away to safety.

If you’re looking for a guaranteed way to kill a cockroach, the best method is to trap it and then spray it directly. This will ensure that the cockroach dies quickly and doesn’t have a chance to escape.

How to Make Sure an Insecticide Works Quickly

Not all cockroaches can fly. Most flying cockroaches are not native to the United States. The large flying cockroach, Blaberus Giganteus, is a tropical cockroach that can be found in southern Florida. Aside from Florida, these roaches are typically common in the Caribbean and South America.

While most cockroaches can scurry away quickly, the large flying cockroach is a slow-moving cockroach. This makes them easier to kill with an insecticide. If you’re trying to kill a fast-moving cockroach, it might be difficult to get the insecticide on them long enough for it to work.

To make sure an insecticide works quickly, it’s important to spray the cockroach directly. You might need to use a heavier hand when spraying these insects. In addition, you’ll want to make sure you’re using an insecticide that is designed to work quickly. Pyrethrin-based insecticides are typically the most effective and work quickly.

Since these large cockroaches are slower, thanks to their heavy exoskeleton, use this to your advantage and make sure the insecticide has time to work.

You should also make sure that you follow the instructions on the insecticide label. This will help to ensure that the cockroach is killed quickly and efficiently.

How Long Does It Take for a Cockroach to Die on Its Back?

We all know what a cockroach looks like, but there’s a lot about them that remains a mystery to some. For instance, why do cockroaches always die on their backs? And how long will it take them to eventually die? In most cases, it takes about 2 minutes for a cockroach to suffocate and die when turned on its back. However, some cockroaches (particularly larger ones) may take up to 5 minutes to die.

There are certain exceptions to this, however. When there’s a nearby food source, a cockroach may be able to survive for a few hours on its back. This is because they’re able to reach the food and keep themselves alive long enough until they’re able to turn themselves over, if they can.

In drier and cooler environments, a cockroach may also be able to survive on its back for a longer period of time. This is because they’re not losing as much water through their body and aren’t in danger of dehydrating. Their metabolism is much slower, and they’re able to conserve energy by remaining asleep for extended periods of time. 

Cockroaches are one of the most resilient creatures on the planet. They can withstand high levels of radiation and even go without food for months at a time. However, when it comes to being on their backs, they’re not so lucky.

While it might be satisfying to see a cockroach flipping around on its back, trying to right itself, know that this process can take days or even weeks. If you want the cockroach dead sooner, the best method is to trap it and then spray it directly with an insecticide. This will kill the cockroach quickly and efficiently.

Why Do Cockroaches Die on Their Backs?

It turns out that there’s a scientific reason behind this phenomenon. Cockroaches have a hard exoskeleton that protects their internal organs. This exoskeleton is also filled with air pockets, which makes cockroaches lightweight and able to move quickly.

When a cockroach is turned over on its back, the air pockets in its exoskeleton become compressed. This makes it difficult for the cockroach to breathe. In addition, the cockroach’s legs are designed for running and are not able to help it turn back over. The cockroach eventually suffocates and dies.

A cockroach on its back ultimately means a death sentence for the insect. Most of the time, it’ll only take a few minutes before a cockroach expires. However, in some cases, a cockroach may be able to survive for up to 40 minutes before succumbing to its fate. Larger ones may even last for an hour or more.

Cockroaches are not the only insects that die on their backs. Butterflies and moths also have a similar problem. Like cockroaches, butterflies and moths have exoskeletons filled with air pockets. When they’re turned over, they can’t right themselves and eventually suffocate leading to their deaths.

Do Cockroaches Play Dead?

Most of us have been there – we see a cockroach lying belly up, not moving, thinking it’s dead. We grab the broom and try to sweep it off from the floor as we ready to throw it out with the trash. But as we get closer, the cockroach scurries away faster than we can blink.

This behavior is called tonic immobility, and it’s the cockroach’s defense mechanism to escape a predator. When a cockroach feels threatened, it will lie on its back and play dead in hopes that the predator will lose interest and go away.

Tonic immobility usually lasts for a few minutes, but some cockroaches have been known to remain in this state for up to 40 minutes. If you’ve ever had the misfortune of seeing a cockroach playing dead, you know that it’s not a pretty sight.

This defense mechanism is not foolproof, however. Some predators are not easily fooled and will eat the cockroach anyway. In addition, while a cockroach is playing dead, it is vulnerable to other predators.

Final Thoughts

Cockroaches are some of the most resilient creatures on the planet, but when sprayed directly, they would only be able to survive for a couple of minutes. Direct contact with pesticide leads to death in 1-5 minutes, depending on the temperature, cockroach size, and the type of pesticide used.

Sure enough, even cockroaches have their limits and some situations will lead them to their demise. If it’s unlucky enough to land on its back and can’t flip itself over, it will eventually die – but not necessarily from being flipped onto its back.

Whether or not a cockroach dies within minutes, hours, days, or weeks just depends on its environment and what’s happening around it. However, if sprayed with a good quality insecticide, some cockroaches will die instantly due to the chemical reactions in their body.