Red Flour Beetle

Red Flour Beetle
  • Size: About 4 mm long
  • Color: Reddish-brown
  • Distinctive Feature: Elongated and flattened body
  • Habitat: Flour and cereal products
  • Detection Element: Presence in flour, cereals, with small reddish-brown insects and fine dust in infected products


The red flour beetle is a small insect, measuring between 2.5 and 4.5 mm in length. It is characterized by a coloration that ranges from yellowish-brown to reddish-brown, a hue that allows it to blend easily into its environment. Its shape is elongated and slightly flattened, facilitating its movement in the smallest crevices. This insect has antennae that end in a club-like shape, a distinctive characteristic that aids in its identification.


The red flour beetle prefers warm and dry environments. It is commonly found in mills, bakeries, grain storage warehouses, and sometimes in private homes. This insect is particularly attracted to floury products, hence its name. It can also feed on other dry products such as cereals, pasta, biscuits, and even chocolate.


The red flour beetle is known for its ability to thrive in difficult conditions. It is particularly resistant to drought and can survive for a long time without food. This insect is nocturnal and tends to hide during the day in cracks or crevices. In terms of reproduction, it is prolific, with a female capable of laying hundreds of eggs in her lifetime. These eggs are deposited directly into the food source, allowing the larvae, once hatched, to feed immediately.

The red flour beetle is also known for its ability to travel long distances in search of food, making it particularly difficult to control in infested environments.

Distinguishing the Red Flour Beetle from Other Insects

Sawtoothed Grain Beetle

Sawtoothed Grain Beetle

The Sawtoothed Grain Beetle is a small reddish-brown insect, similar in color to the red flour beetle, but it differs in its slightly smaller size (2 to 3 mm) and its thinner, more elongated body. The antennae of the Sawtoothed Grain Beetle are also different; they are more filiform and do not have the club-like enlargement characteristic of the red flour beetle. Moreover, the Sawtoothed Grain Beetle prefers more humid environments and primarily feeds on stored grains that are already damaged or decaying.

 Rice Weevil

Rice Weevil

The Rice Weevil is slightly larger than the red flour beetle, measuring between 3 and 4 mm. Its main distinctive feature is its oval shape and more robust body. Dark brown in color, it is easily recognizable by its snout, a kind of elongated “nose,” used for piercing grains to feed and lay eggs. Unlike the red flour beetle, the Rice Weevil mainly infests rice, corn, and whole grains.

German Cockroach

German Cockroach

German Cockroaches are significantly larger than the red flour beetle, measuring up to 13-16 mm. Their color varies from light brown to dark brown, and they have two dark stripes on their pronotum (the part just behind the head). Cockroaches are omnivores and are often found in damp and warm areas like kitchens and bathrooms, unlike the red flour beetle which prefers dry products.

Powderpost Beetle

Powderpost Beetle

The Powderpost Beetle is an insect that infests wood, unlike the red flour beetle which infests food products. Powderpost Beetles are larger, measuring between 3 and 7 mm, and have an elongated body that is dark brown in color. Their antennae are also longer and thinner compared to those of the red flour beetle. Powderpost Beetles feed on dry wood, particularly hardwoods, and are therefore rarely found in the same environments as the red flour beetle.

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