Why Do I See More Roaches After the Bombing? Pest Control Dynamics

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Cockroaches are one of the most irritating pests, especially in summer. Getting rid of them is always a challenging task. You may use various methods, including bombs, to remove them, but you can’t exterminate them properly. So, you may wonder, why do I see more roaches after the bombing?

If you see more cockroaches after the bombing, there could be several reasons. Some cockroaches survive initial treatment and hide in inaccessible areas. When you stop bombing them, they may reappear in the area.

Do you want to know more about the reasons for cockroach presence after the bombing? Read the below information to have in-depth knowledge about it.

What Do You Know About Bug Bombs?

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Bug bombs are devices used to disperse insecticide into an enclosed space to kill insects. You can use them to control cockroaches in your home, office, and other indoor spaces. These devices quickly release a stream of pesticides into the air.

Before using a bug bomb, read and follow the manufacturer’s instructions carefully. Typical procedures involve shutting off pilot lights and flames, covering or removing exposed food, utensils, and dishes, and leaving the treated space empty during the application.

Although bug bombs can cover large areas, they can’t reach the cracks and crevices where several insects frequently hide. Thus, the bug fogger will only affect cockroaches actively looking for food unless they emerge from their hiding places.

In addition to their limited efficacy, these devices pose significant risks if not handled appropriately. Later on, breathing in the mist can lead to breathing difficulties. Therefore, you should be careful while dealing with bug bombs.

Reasons for More Cockroaches After Bombing


Below are some reasons for more cockroaches after the bombing.

No Hidden Roaches Were Affected by the Product

Bug bombs release insecticides into the air, however, they may not reach all areas of the infested space. Cockroaches frequently hide in cracks, fissures, and other hard-to-reach locations. If the insecticide doesn’t reach these hiding places, the cockroaches will live and possibly reproduce.

Unlike crack and crevice treatments, the mist can’t infiltrate into open cracks or holes. Roaches are rarely seen in public. These pests spend the day hiding in their homes, only emerging at night when it’s dark and there’s little to no activity inside the infested room. If you notice one roaming about your home in broad daylight, you most likely have a serious infestation.

Cockroach Resistance to Product

Some cockroach populations are resistant to the active components in conventional pesticides. Repeated exposure to the same toxins over time can result in the survival of resistant cockroaches, which helps the population to resurrect.

This evolution is a natural reaction to chemical exposure. As a result of resistance, the roaches that survive the initial pesticide application may grow in number.

Ineffective Coverage

Another reason you might observe more roaches after bombing is insufficient pesticide coverage in your home. Bug bombs frequently fail to reach cracks, crevices, and other roach hiding places. As a result, roaches may reproduce in regions where the pesticide did not reach, boosting their population.

Moreover, not all pesticides are equally efficient against all cockroach species. The pesticide used in the bug bomb may not be as effective in suppressing the population if it does not target the type of cockroach infesting the region.

Disruption of CockRoach Colonies

Another reason for cockroach presence after the bombing is the disruption of cockroach colonies. The use of bug bombs can disrupt established colonies of cockroaches in your home or property, causing them to scatter. When a bomb goes off, roaches rush out of their hiding places to avoid the pesticide. This increased activity might create the appearance of a larger infestation.

Therefore, it’s critical to understand the causes of increased roach visibility after bombing so that you can take proper measures to manage the problem.

The Bug Bomb Didn’t Work

If the product isn’t strong enough to kill the pests, you may encounter more roaches after bombing your home. Despite their risks, your home may take more than one bug bomb to eliminate everything hidden inside. Using more than one is usually frowned upon due to safety issues, which means you will still have roach problems.

Therefore, using more than one bomb at a time is not recommended. However, if you’ve already used the product and haven’t noticed any benefits after a few weeks, your original therapy may have failed.

Hatching of New Eggs

Although bug bomb eliminates the general cockroach population, an infestation may persist if eggs hatch and grow into adults. German cockroaches reproduce quickly, with 40 eggs in each egg. These newly hatched eggs can generate new cockroaches within 60 days due to fast maturation.

If the misty insecticide doesn’t kill concealed eggs, you may have a robust infestation in a month or two. The extent of the issue could not even become apparent to you until much later because cockroaches usually love to remain hidden.

Your Home May Not Be the Source of Cockroach Infestation

If you live in an apartment, cockroaches can move from one room to another. Even if you don’t have cockroaches in your home, nearby cockroaches can spread infestation. Because their home is some other place, it would be difficult to eliminate cockroaches with the bombing.

Keep in mind that roaches can infest even the cleanest homes, and if your neighbors have them, it won’t take long for the infestation to grow out of control in your house or apartment. Therefore, you should contact a pest control company if the situation seems out of your control.

Can Cockroaches Resist Pest Control?

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Cockroaches are well known for their flexibility and resilience, making them difficult pests to control. Because of their fast reproduction and short life cycles, they can develop resistance to some types of pesticides over time. They have genetic adaptations that make them resistant to specific insecticides.

Therefore, when you expose cockroaches to insecticides, only susceptible ones die, leaving behind the resistant cockroaches. Moreover, they can alter their behavior to avoid contact with certain pesticides. Additionally, excessive use of the same insecticides develops natural resistance in the cockroach population.

However, certain types of insecticides containing bendiocarb and diazinon are ineffective at killing roaches. Therefore, you should always read the ingredient list before buying any insecticide to remove roaches.

Is It Normal to Find Roaches After Treatment?


Yes, it’s normal to find cockroaches after a bombing or another treatment. This is because bombing or other extermination methods don’t kill the cockroaches instantly. Rather, cockroaches might become more active and move across the area at incredibly high rates.

Cockroaches used to appear after the treatment due to several reasons. They may be upset by the treatment and start acting impulsively. Bombing forced them to move out of their habitat in search of safe territory. They may get hungry due to a shortage of food and to fulfill their appetite, you may see them wandering around.

However, you might also observe several roaches immediately or within a few days after the pest control approach, but this may vary with multiple roach treatments. Therefore, if you don’t notice cockroaches, immediately after the treatment, they are most likely to die.

Does Bombing the House Kill Cockroaches?

Yes, bombing can kill cockroaches but it’s not effective to exterminate them completely. While bombing or employing insect foggers (also known as bug bombs) can help eliminate cockroaches, it is crucial to note that it may not clear the infestation. In addition to being hardy pests that can conceal themselves in nooks and crannies, cockroach eggs may also be resistant to some insecticides.

Bug bombs emit an insecticide fog into the air, coating the treated area. While this will kill exposed cockroaches, it may not reach all of their hiding locations. Furthermore, some cockroach species have developed pesticide resistance over time. Therefore, it’s recommended to combine pesticide treatments with other integrated pest management (IPM) tactics for more efficient cockroach control.

What Should You Do After Using Foggers if You Notice Roaches?


Below are some tricks that you should do if you notice cockroaches after the bombing.

Follow the Product Instructions

The first thing you should do after noticing roaches is to follow the product instructions. You should thoroughly read all directions, including all safety concerns, and attempt again for excellent results. Make sure to open all the drawers and cabinets before employing foggers.

Move all equipment around so that the fogger particles may readily reach the backside or hidden areas. You should clean the already dead roache before another application. Moreover, make sure there are no more secure hiding places for roaches.

Put Enough Foggers in Your Home to Cover Every Area

After reading the instructions, the next step is to thoroughly cover each space with a fogger. Check that you are not under-bombing the required room size per fogger. If you have a large cockroach infestation, consider adding another fogger to larger rooms or halls.

Use Foggers Along with Insect Repellent

Although foggers are easy to use and the first line of defense against cockroaches, you can combine them with another insect repellent to make them more effective. If you finish your pest control treatment with fogging, you can add another treatment for better results.

You can spray pesticide behind appliances, within cupboards, and on door hinges. Spray even if you don’t see anything since roaches will die for a few days after coming into touch with the sprayed insecticide. Additionally, you can also place cockroach bait behind appliances for better outcomes.

Give the Process Some Time to Settle

Foggers do not use magic; instead, their rater is an insecticide spray that spreads to every part of the room. After a few hours of physical contact—either by inhalation or direct body contact—the pesticide inside the fogger settles down on exposed surfaces and kills bugs and roaches.

A few roaches may have died instantly from a rather little dosage because of the sluggish procedure. Some cockroaches may survive the procedure. Thus, giving it enough time before moving on might be beneficial. Let at least a day pass before deciding on your next step.

Don’t Be Too Frugal When Using the Foggers

Every fogger specifies the amount of space that their product can cover. You can even use twice as much in certain circumstances, but you should never use less than what is specified on the container because the results won’t be good.

Examine a Persistent External Infection

It is quite common to find cockroaches entering your home from outside in apartments and buildings where roach infestations are a common occurrence. Therefore, you should regularly examine the area for outside cockroach infestation. If you find any outside source of cockroach infestation, remove it first before bombing your house.

However,  if your neighbors have a roach problem, it’s challenging to stop cockroaches from re-infesting your flat. Therefore, it’s recommended to invest money in extra foggers for your neighboring flat to eradicate the roach infestation.

Clean the Area After Treatment

Clean Area

After utilizing the treatment, it is crucial that you thoroughly clean the entire house. It is done to eliminate all of the roach eggs that will undoubtedly be present if you have an infestation in your home, in addition to getting rid of the deceased insects. It will keep the dead roaches from invading you in retaliation for the genocide you just committed.

Moreover, you should wear gloves and use the proper cleaning solutions for optimal safety.

Ensure that the Exterior Areas are Free of Roaches

It is not enough to get rid of all the roaches in your house if they are still living on the other side of the wall, as they will undoubtedly return. In this situation, insect bombardment should take place either throughout the structure or in a specific wing.

Furthermore, in the case of a private residence, you should also carefully examine whether cockroaches are not entering from the outside. If you have a garage attached to your house, inspect it regularly for pests. The goal is to keep your home clean and to prevent new infestations.

What Should You Do Before Spraying Cockroaches?

Below are things that you should do before spraying cockroaches.

Clean Your House

Clean Your House

The first thing you should do before spraying cockroaches is to clean your house properly. Cockroaches are drawn to food crumbs, spillage, and waste. Before spraying, properly clean the places where cockroaches are prevalent. These include kitchens, restrooms, and other areas where they may obtain food and water.

Moreover, you should dry all damp areas. It eliminates all food sources that may appeal to cockroaches. Even better, it forces them to use the bait formulation instead.

Remove All Appliances and Food Sources

Remove any small things or equipment from the countertops. Move them to an open area where cockroaches can’t hide. Prepare appliances such as microwaves, toasters, and coffee makers for examination and treatment as needed. Furthermore, you should remove all food sources like food particles, including bread, sweets, sugar, and snacks to ward off cockroaches.

Clean or Vacuum the Carpets


Cleaning or vacuuming your carpets is also part of cleaning your house. It will kill any cockroaches and their eggs that are hiding between the carpet threads. Therefore, you should mob or vacuum all the carpets of your house to prevent cockroach infestation after the bombing.

Move Furniture and Appliances to Boost Accessibility

Make your home easily accessible whether you are hiring a professional exterminator or doing it yourself. Begin by relocating major items of furniture and appliances to keep them safe from spills. It also makes it easier to reach cockroach hiding places to eradicate them.

Cover Trash Bins, Baskets, and Baby Toys

Cover Trash Bins

To prevent contamination, keep crib mattresses, changing tables, infant toys, and other equipment in a secure box. Before putting them away, you can also cover them with non-porous, impermeable materials. Moreover, you should cover all the garbage cans to keep cockroaches away.

Empty Garbage Cans

Another thing you should do before bombing cockroaches is to empty all the garbage cans. If this isn’t feasible, think about using tightly sealed containers. It will stop cockroaches on the run from looking for new places to hide.

Have New Roaches Infested Your Home After They Are Exterminated?

Yes, there is a possibility of cockroach infestation after they are exterminated. It can be aggravating if you recently had your home treated for roaches and are constantly seeing new infestations. There are various reasons for cockroach infestation after extermination. 

Some roaches may have survived and proceeded to multiply if the extermination operation was not thorough. Cockroaches can be transported back into your home by infested products, groceries, or other sources. Therefore, you should inspect arriving items for roaches. Moreover, If your neighbors have roach issues, the roaches could be coming from surrounding infestations.

How Can You Prevent Cockroaches from Returning?

There are several ways to prevent cockroaches from returning, some of them are given below.


Cleaning your home is the first and most crucial step in preventing roaches from returning. Begin by frequently washing the floors and vacuuming the carpets. You should also make an additional effort to do the dishes before going to bed because roaches prefer to eat leftover food.

Moreover, store your meals and leftovers in sealed containers to decrease food sources for pests. Finally, clean your backyard weekly to remove any organic materials that may attract cockroaches into your home.

Drying the Damp Areas

Cockroaches flourish in moist environments. However, they can’t survive for a week without water. As a result, roach species such as Oriental cockroaches prefer to hide in locations such as cellars, leaf piles, and water pipelines. As a result, you should inspect and dry all damp and moist areas. Furthermore, you must endeavor to repair leaks as quickly as feasible.

Seal All Entry Points

Seal All Entry Points

Cockroaches can get into your home through the smallest cracks and holes. As a result, you should seal all cracks and gaps around doors and windows. It will keep roaches away from your home. Additionally, as roaches enjoy making rides through furniture, groceries, and laundry, inspect these goods before bringing them home.

Cover Garbage Cans

Roaches love trash cans and thrive in the habitat they give. Organic materials, standing water, and rotting food are all found in garbage bins. Thus, make sure the bins are securely closed to keep cockroaches out. Further, to prevent the waste from spilling over the floor, you should also refrain from filling your trash cans to the brim.

Use Diatomaceous Earth

Diatomaceous Earth

Diatomaceous earth is a powerful natural pesticide against roaches. The fossilized earth is accessible in powder form and is harmful to insects with exoskeletons, such as cockroaches. It is simple to apply this method because you only need to put the powder evenly on surfaces where roaches congregate. Simply leave the diatomaceous earth powder to work its magic for a few days.

Harms of Bug Bombs

While bug bombs can help control certain pests, they are not without hazards and drawbacks. Some of the problems of bug bombs are as follows:

  • Bug bombs don’t reach effectively in all areas, leading to incomplete pest control.
  • They may leave pesticide residue on the infested area, posing several health issues to you and your children.
  • If you accidentally inhale the pesticide residue of bug bombs, you may experience symptoms, like dizziness, headache, nausea, vomiting, and respiratory irritation.
  • Because bug bombs are highly flammable, there is a risk of fire and explosion if you use them near open fires or pilot lights.
  • The use of bug bombs contributes to environmental pollution because the residue may contaminate air, water, and soil.
  • Above all, prolonged use of bug bombs develops resistance in cockroaches.

Do Foggers Make Cockroaches Come Out?

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Yes, in some cases foggers make cockroaches come out. Foggers work by releasing pesticides in the form of aerosols, which cover the treated area with the pesticide. When you turn on the fogger, it can disturb cockroaches in their hiding places, forcing them to wander about to get away from the treated area.

However, foggers’ efficiency in suppressing cockroach infestations varies. Cockroaches are hardy insects, and certain species have acquired resistance to specific chemicals. It is noteworthy that foggers are helpful tools in pest management strategies, but their effectiveness is enhanced when combined with other approaches, including targeted insecticide applications, hygienic measures, and exclusionary measures.

Furthermore, as stated on the fogger’s label, correct preparation and follow-up actions are essential for a successful treatment.

How Fast Do CockRoaches Go Away After Extermination?

The time it takes for roaches to leave following treatment is determined by the type of treatment employed and the degree of the infestation. Generally, it takes two to three weeks for cockroaches to die after the treatment. However, eliminating all roaches may take weeks or even months in extreme circumstances.

It is vital to know that cockroach treatment involves a comprehensive approach that includes continuing sanitation, baiting, and perhaps chemical treatments. Effective cleanliness can help reduce the food and water supplies that roaches rely on for survival, exposing them to bait and insecticides more frequently. Furthermore, regular bait treatments can assist in ensuring that any lingering roaches are drawn to them and destroyed.

Although the exact duration required to eradicate roaches may differ, it is typically done in a few weeks if the right measures are implemented.

How Do You Know If Cockroaches Are Gone?

Because cockroaches are nocturnal and frequently hide in inaccessible places, determining whether they are fully gone can be difficult. However, below are some signs of cockroach absence.

  • If you noticed cockroaches previously and their stingings start droppings, it may be a positive sign.
  • Reduction in the cockroach droppings is also a sign of cockroach absence.
  • If your food storage remains uncontaminated and you don’t find any sign of cockroaches around, it may also indicate that cockroaches are gone.
  • As cockroaches produce a musty odor, if you reduce it, there may be a chance of cockroaches eradication.
  • Moreover, another thing you can use to determine whether cockroaches are gone or not is the use of traps. Prepare a roach bait and place it around the areas where you saw cockroaches previously. If no roch trap in it, then it would be a positive sign.

What Should You Do After You Bug Bomb Your House?

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Here are some tips that you should follow after bug bombing your house.

  • Follow the instructions on the bug bomb product and ensure to wait outside your house until the completion of the procedure.
  • You can return home only after the completion of the treatment.
  • Ventilate the area properly by opening doors and windows to allow the circulation of the fresh air.
  • Clean all the exposed surfaces, especially the ones used for food storage.
  • Wash all the bedsheets, curtains, and other fabric to remove any residue.
  • Discard any food items that you left open during the bombing.
  • Moreover, be careful about returning to the area especially if you have respiratory problems.
  • Above all, keep an eye on whether the treatment completely eradicates the roaches or not. If you find any cockroaches after the treatment, repeat the procedure.

Final Thoughts

Removing cockroaches from your home or property is always a challenging task. There are various methods to ward them off, including fogging or bombing. Bug bombs are a method that you can use if you tried all other remedies, but all in vain. However, in some cases, you may notice cockroaches even after the bombing.

There are different reasons for cockroach appearance after the treatment, including cockroach resistance and ineffective treatment. However, you should follow precautionary measures before and after the bug bombs to kill cockroaches, especially following the product labels. After all, if you are not an expert in bombing the roaches, ask for help from a professional pest control company.


Yes, cockroaches can come back after the bombing. Although there are several reasons for their return, you may probably notice more roaches because they try to escape the chemicals killing them. So, they move around quickly to find a safe habitat.

The time to see cockroaches after spraying varies depending on several factors, including the type of pesticide, the extent of infestation, and the type of cockroach species. However, in general, it may take one to two weeks to stop seeing cockroaches after the treatment.

You may see baby cockroaches after the treatment because a normal cockroach’s life cycle takes approximately 100 days from egg to adult, babies may still be hatching during your cockroach treatment.

Yes, you can sleep in your room after spraying if don’t feel any smell. Moreover, If the spray has no aroma at all, leave the room with forced air circulation (a fan) for a full day before going to bed.