Flour Beetle in Bedroom: Causes and Prevention

Flour beetle causes and prevention

Have you ever noticed small, reddish-brown beetles in your bedroom? If so, you may have a flour beetle infestation. Flour beetles are a common household pest that can be found in pantries, kitchens, and bedrooms. They feed on flour, cereal, and other grains, and can quickly multiply if left unchecked.

In this blog, we’ll discuss the causes of flour beetle infestation in bedrooms and how to prevent them. We’ll also provide tips on how to get rid of red flour beetles in bedroom if you already have an infestation. So if you’re dealing with flour beetles in your bedroom, read on to learn more about this pesky pest and how to keep them away.

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A Quick Causes & Prevention Table:

Poor sanitationRegularly clean and vacuum
Stored grainsKeep grains sealed and dry
Cracks and gapsSeal any cracks or gaps
InsecticidesUse insecticides as needed

Flour Beetle:

Flour beetles are a type of insect that belongs to the family Tenebrionidae. There are two main species of flour beetles that are of concern to humans: the red flour beetle and the confused flour beetle. These insects are commonly found in grain storage facilities, where they can infest and contaminate stored grains such as wheat, corn, and rice.


There are several types of flour beetles exists that are commonly found infesting stored grains and grain-based products. These include:

  1. Red flour beetle (Tribolium Castaneum): This is a small, reddish-brown beetle that is commonly found in stored grains, flour, and cereals. It is found throughout the world and is particularly common in warm, humid environments.
  2. Confused flour beetle (Tribolium confusum): This is a closely related species to the red flour beetle, but is slightly smaller in size and has a more mottled appearance. It is also found in stored grains and flour and is often found in the same locations as the red flour beetle.
  3. Lesser grain borer (Rhyzopertha Dominica): This is a small, dark-colored beetle that is commonly found in stored grains, flour, and cereals. It is found throughout the world and is particularly common in warmer climates.
  4. Sawtoothed grain beetle (Oryzaephilus surinamensis): This is a small, brown beetle that is commonly found in stored grains, flour, and cereals. It is found throughout the world and is particularly common in warmer climates.

All of these flour beetles are considered pests because they can infest stored grains and grain-based products, causing damage and spoilage. They are also capable of transmitting diseases, which makes them a potential health hazard. It is important to store grains and grain-based products in a dry, cool place to prevent infestation by these pests.

Causes of Flour Beetle Infestation:

1. Poor Sanitation:

Flour beetles are attracted to food sources that are not properly stored or cleaned up. This includes flour, cereals, grains, and other food items that are left out in the open or stored in damp, dark places.

2. Poor Storage Conditions:

Flour beetles can also be attracted to food sources that are stored in containers that are not airtight. This includes cardboard boxes, paper bags, and plastic containers that are not sealed properly.

3. Contaminated Food Sources:

Flour beetles can also be attracted to food sources that have been contaminated with their eggs or larvae. This includes flour, cereals, grains, and other food items that have been infested with flour beetle eggs or larvae.

4. Poor Hygiene:

Flour beetles can also be attracted to food sources that have been handled by people who do not practice good hygiene. This includes food items that have been touched by hands that have not been washed properly after handling raw meat or other contaminated items.

Prevention Methods for Red or Confused Flour Beetle:

Preventing a flour beetle infestation is the best way to deal with these pests:

  • To prevent flour beetles from entering your home, store all food in airtight containers made of glass, metal, or plastic.
  • Inspect all packages of food before you bring them into your home to make sure they are not already infested.
  • If you find evidence of an infestation (e.g., live insects or larvae), do not bring the food into your home.
  • You can also try to prevent an infestation by keeping your kitchen clean and free of crumbs and spills.
  • Vacuum regularly and dispose of garbage promptly. Be sure to clean under appliances and in other hard-to-reach areas where flour beetles like to hide

How To Get Rid Of Flour Beetles In Bedroom?

Flour beetles are one of the most common pests in the United States. These little red or dark brown bugs can be found in any home, especially in areas where flour, grain, or other food is present. If you have flour beetle in your bedroom, there are a few things you can do to get rid of it.

Locate The Source:

First, it is important to identify where the infestation is coming from. Flour beetles typically enter homes through food that has already been infested with them. This means that if you have an open bag of flour or cereal in your kitchen, chances are good that the beetles have already made their way into your home. Once they are inside, they will spread to other areas in search of food.

Eliminate the Source:

Once you have located the source of the infestation, you can begin to get rid of the flour beetle by eliminating its food source. This means getting rid of all open bags of flour or cereal and any other food that may be infested. You should also vacuum any areas where flour or grain has been spilled.


After you have eliminated the food source, you can begin to treat the area for the beetles. One way to do this is to place sticky traps around the perimeter of the room. These traps will capture the beetles as they try to enter the room in search of food. Another way to treat the area is to spray it with an insecticide designed specifically for flour beetles. Be sure to follow all directions when using insecticide and keep children and pets away from sprayed areas until it is completely dry.

What Are The Risks Of Flour Beetle Infestation?

Here are some of the risks of a flour beetle infestation:

  1. Damage to grains and grain products: Flour beetles can cause significant damage to grains and grain products, rendering them unfit for human consumption. They can chew through the outer layers of grains, causing them to become brittle and prone to breaking. In addition, flour beetles can contaminate grains and grain products with their feces, which can cause them to become spoiled or rancid.
  2. Economic losses: Flour beetle infestations can lead to significant economic losses for farmers, grain storage facilities, and consumers. Farmers may lose a significant portion of their crops to flour beetles, which can reduce their profits. Grain storage facilities may also incur losses due to the need to discard infested grains and grain products, as well as the cost of pest control measures. Consumers may also experience economic losses if they purchase infested grains or grain products.
  3. Health risks: Flour beetles and their feces can contain a variety of pathogens and toxins that can cause food poisoning or other health problems in humans. In addition, the presence of flour beetles in food products can lead to allergic reactions in some individuals.
  4. Difficulty in controlling infestations: Flour beetles can be difficult to control once an infestation has occurred. They can reproduce quickly, and their small size allows them to easily hide in cracks and crevices in storage facilities. Effective pest control measures may be required to eliminate flour beetle infestations.
  5. Difficulty in detecting infestations: Flour beetles are small and can be difficult to detect, especially in the early stages of an infestation. As a result, infestations may go unnoticed for a long time, which can allow the beetles to multiply and cause even more damage.

Signs Of Flour Beetle Infestation:

Signs of an infestation include the presence of adult beetles or larvae, shed skin, or small holes in food packaging. Larvae are small, white, and worm-like with dark heads. They are often found in cracks and crevices near food sources. Adult beetles are dark brown or reddish brown and about 1/8 inch long. Both adults and larvae feed on a variety of items including cereal products, rice, dried fruit, nuts, chocolate, and even non-food items such as tobacco.

Let’s Compare Flour Beetle and Bed Bug:

CharacteristicsFlour BeetleBed Bug
AppearanceSmall, reddish brown in color with a shiny exteriorFlat and oval-shaped, reddish brown in color with a wrinkled appearance
SizeApproximately 1/8 inch in lengthApproximately 3/16 inch in length
DietFeed on flour, cereals, and other stored grainsFeed on the blood of humans or other warm-blooded animals
HabitatFound in pantries and storage areas where food is keptFound in beds, furniture, and other areas where humans sleep or rest
DefenseCan release a defensive chemical called quinones when threatenedCan release a defensive chemical called pheromones when threatened
ImpactCan contaminate food stores, leading to financial losses for businesses and householdsCan cause itchy bites and allergic reactions in humans, leading to discomfort and potential health issues


How Did I Get Flour Beetles?

Flour beetles are often brought into homes in infested packages of food. Once inside, they can spread quickly to other food sources. These pests are also attracted to homes that have moisture problems, so they may be found near plumbing leaks or other water sources.

How Do I Know If I Have A Flour Beetle Infestation?

You may see these pests crawling on the surface of packages or on your countertops. Flour beetles can also be found in cracks and crevices around your kitchen. If you see small, brown insects in your pantry or kitchen, they may be flour beetles.

Do Flour Beetles Have The Ability To Bite Humans?

Flour beetles, also known as grain beetles, are small insects that are commonly found in stored grains and flour. They are known to infest pantries and kitchen cabinets where they can feed on a variety of stored food products. Flour beetles are not known to bite humans, and they do not pose a threat to human health.


Red flour beetles in a bedroom can be a serious threat to your food supply. To prevent these pests from infiltrating your bedroom, it is crucial to store food items in airtight containers and keep them away from the bedroom. Regular cleaning and vacuuming can also help to eliminate any hiding spots for the beetles. If you do experience an infestation, it is best to seek the assistance of a professional pest control service to effectively eliminate the problem.

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